Simple Lists-Based Controls

Introduction

A list-based ontrol is an object that holds a list of values, such as a list of strings, a list of numbers, etc. In fact, in some cases, a control can hold a list of lists, in which case each item in the list contains its own list of things.

List Boxes

A list box is a control that holds a verical list of items. The list starts with an item and each subsequent item is added below the previous one. To start, the control presents a list. To select an item from the list, the user can click the desired item. To make another selection, the user can click a different item. Depending on how the control is configured, the user can be restricked to select only one item at a time or the user can allowed to select many items at the same time.

To make sure you can create a list box, the Toolbox is equipped with a ListBox button. You can click it and click a form or a controls container of your application. To let you manage the characteristics of a list box, the .NET Framework provides a class named ListBox.

Practical LearningPractical Learning: Introducing Windows Controls

  1. Start Microsoft Visual Studio
  2. Create a Windows Forms App named MeasuresOfCenter1
  3. In the Solution Explorer, right-click Form1.cs -> Rename
  4. Type MeasuresOfCenter (to get PayPreparation.cs) and press Enter twice
  5. Design the form as follows:

    Measures of Center

    Control Name Text
    Label Label   Value (x):
    TextBox ListBox txtValue  
    Button Button btnAdd Add
    ListBox Label lbxValues  
    Label Label   Sum:
    TextBox Text Box txtSum  
    Label Label   Number of Values:
    TextBox TextBox txtMode  
    Label Label   Mean:
    TextBox Text Box txtMean  
    Label Label   Median:
    TextBox TextBox txtMedian  
    Label Label   Midrange:
    TextBox ListBox txtMidrange  
    Label Label   Number of Values:
    TextBox ListBox txtCount  
    Button Button btnClose Close
  6. On the form, double-click the Add button
  7. Return to the form and double-click the Clear button
  8. Return to the form and double-click the Close button
  9. Change the document as follows: 
    namespace MeasuresOfCenter1
{
    public partial class MeasuresOfCenter : Form
    {
        public MeasuresOfCenter()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            // This is the value that will be added to the text box
            double value, sum = 0.00;
            double mean, median, midrange;

            // Check that the user entered a value in the text box
            if (string.IsNullOrEmpty(txtValue.Text))
            {
                MessageBox.Show("You must enter a value in the top text box.",
                                "Measures of Center",
                                MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            try
            {
                // Get the value the user entered
                value = double.Parse(txtValue.Text);
                // Add it to the list box
                lbxValues.Items.Add(value);

                txtValue.Text = "";
                txtValue.Focus();
            }
            catch (FormatException)
            {
                MessageBox.Show("The value you entered is invalid.",
                                "Probability Distribution",
                                MessageBoxButtons.OK, MessageBoxIcon.Information);
            }

            // Calculate the total
            for (int i = 0; i < lbxValues.Items.Count; i++)
                sum += double.Parse(lbxValues.Items[i].ToString()!);
            // Calculate the mean
            mean = sum / lbxValues.Items.Count;

            // Find out if the list is odd
            if ((lbxValues.Items.Count % 2) == 0)
            {
                double midIndex = lbxValues.Items.Count / 2;
                int ind = (int)(midIndex - 0.5);
                double aValue = double.Parse(lbxValues.Items[ind].ToString()!);
                median = (aValue + aValue) / 2;
            }
            else
                median = double.Parse(lbxValues.Items[lbxValues.Items.Count / 2].ToString()!);

            // Calculate the midrange as the mean between the minimum and maximum
            midrange = midrange = (double.Parse(lbxValues.Items[0].ToString()!) +
                                   double.Parse(lbxValues.Items[lbxValues.Items.Count - 1].ToString()!)) / 2;

            // Display the values
            txtCount.Text    = lbxValues.Items.Count.ToString();
            txtSum.Text      = sum.ToString();
            txtMean.Text     = mean.ToString();
            txtMedian.Text   = median.ToString();
            txtMidrange.Text = midrange.ToString();
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            txtValue.Text = string.Empty;

            lbxValues.Items.Clear();
            txtSum.Text      = string.Empty;
            txtCount.Text    = string.Empty;
            txtMean.Text     = string.Empty;
            txtMedian.Text   = string.Empty;
            txtMidrange.Text = string.Empty;
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}
  10. To execute the application, press Ctrl + F5:

    Measures of Center

  11. Type each of the following values and click Add after each: 72604, 7592, 6314, 57086, 24885, and 47933
    Measures of Center Measures of Center
    Measures of Center Measures of Center
  12. Click the Clear button
  13. Close the form and return to your programming environment

Combo Boxes

A combo box is version of a list box in a reduced size. Like a list box, a combo box holds a list of values. Instead of displaying a whole list like a list box does, a combo displays only one item. The control is maded of a text box and a button that has a down-pointing arrow. To make a selection, the user can click the arrow button to open the list and click the desired item.

To let you create combo boxes, the Toolbox is equipped with a button labeled ComboBox. You can click that button and click an area in your form. To help you manage the behavior of your combo box, the .NET Framework is equipped with a class named ComboBox. You can use the Properties window to visually mange those characteristics.

Practical LearningPractical Learning: Introducing Combo Boxes

  1. Start a new Windows Forms App named AutoPartsInventory2
  2. In the Solution Explorer, right-click AutoPartsInventory2 -> New -> Folder
  3. Type Models as the name of the folder
  4. In the Solution Explorer, right-click Models -> Add -> Class...
  5. Type AutoPart as the name of the class
  6. Press Enter
  7. Change the document as follows: 
    namespace AutoPartsInventory2.Models
{
    internal readonly struct AutoPart
    {
        public long    PartNumber { get; init; }
        public int     Year       { get; init; }
        public string? Make       { get; init; }
        public string? Model      { get; init; }
        public string? Category   { get; init; }
        public string? PartName   { get; init; }
        public double  UnitPrice  { get; init; }
        public string? ImageFile  { get; init; }
    }
}
  8. In the Solution Explorer, right-click Form1.cs -> Rename
  9. Type AutoPartsInventory (to get AutoPartsInventory.cs) and press Enter twice
  10. Design the form as follows:

    College Park Auto-Parts - Parts Inventory

    Control (Name) Text Other Properties
    Label Label   Vehicle Year:  
    Label Label   Make:  
    Label Label   Model:  
    Label Label   Category:  
    ComboBox Combo Box cbxYears   DropDownList
    ComboBox Combo Box cbxMakes   DropDownStyle: DropDownList
    ComboBox Combo Box cbxModels   DropDownStyle: DropDownList
    ComboBox Combo Box cbxCategories   DropDownStyle: DropDownList
    Label Combo Box   Part Name/Description:  
    TextBox Text Box txtPartName    
    Label Combo Box   Unit Price:  
    TextBox TextBox txtUnitPrice   TextAlign: Right
    PictureBox Picture Box pbxAutoPart   BorderStyle: FixedSingle
    SizeMode: AutoSize
  11. Double-click an unoccupied area of the form to generate its Load event
  12. Return to the form and double-click its Vehicle Year combo box
  13. Return to the form and double-click the Make combo box
  14. Return to the form and double-click the Model combo box
  15. Return to the form and double-click the Category combo box
  16. Change the document as follows: 
    using AutoPartsInventory2.Models;

namespace AutoPartsInventory2
{
    public partial class AutoPartsInventory : Form
    {
        internal AutoPart[] AutoParts { get; set; } = new AutoPart[30];

        public AutoPartsInventory()
        {
            InitializeComponent();
        }

        private void AutoPartsInventory_Load(object sender, EventArgs e)
        {
            AutoParts[0]  = new AutoPart() { PartNumber = 393795, Year = 2015, Make = "Buick",     Model = "Regal", Category = "Alternators & Generators", PartName = "DB Electrical Alternator", UnitPrice = 218.74, ImageFile = "928037.png" };
            AutoParts[1]  = new AutoPart() { PartNumber = 928374, Year = 2018, Make = "Chevrolet", Model = "Express 3500", Category = "Shocks, Struts & Suspension", PartName = "Suspension Kit (Front; with 3 Groove Pitman Arm)", UnitPrice = 142.44, ImageFile = "304031.png" };
            AutoParts[2]  = new AutoPart() { PartNumber = 148040, Year = 2010, Make = "Chrysler",  Model = "Town & Country 3.8L", Category = "Alternators & Generators", PartName = "Alternator", UnitPrice = 118.37, ImageFile = "148040.png" };
            AutoParts[3]  = new AutoPart() { PartNumber = 730283, Year = 2020, Make = "Jeep",      Model = "Wrangler Unlimited Sahara", Category = "Oil Filters", PartName = "Hydraulic Cylinder Timing Belt Tensioner", UnitPrice = 14.15, ImageFile = "730283.png" };
            AutoParts[4]  = new AutoPart() { PartNumber = 290741, Year = 2015, Make = "Ford",      Model = "F-150 XL 3.5L V6 Flex Regular Cab 2 Full-Size Doors", Category = "Shocks, Struts & Suspension", PartName = "Front Strut and Coil Spring Assembly - Set of 2", UnitPrice = 245.68, ImageFile = "290741.png" };
            AutoParts[5]  = new AutoPart() { PartNumber = 740248, Year = 2013, Make = "Chevrolet", Model = "Equinox", Category = "Bearings & Seals", PartName = "Wheel hub bearing Assembly", UnitPrice = 99.95, ImageFile = "740248.png" };
            AutoParts[6]  = new AutoPart() { PartNumber = 283759, Year = 2012, Make = "Dodge",     Model = "Charger 3.6L", Category = "Starters", PartName = "DB Electrical SND0787 Starter", UnitPrice = 212.58, ImageFile = "283759.png" };
            AutoParts[7]  = new AutoPart() { PartNumber = 503502, Year = 2008, Make = "Jeep",      Model = "Wrangler", Category = "Alternators", PartName = "Alternator", UnitPrice = 114.46, ImageFile = "503502.png" };
            AutoParts[8]  = new AutoPart() { PartNumber = 130338, Year = 2011, Make = "Buick",     Model = "Enclave", Category = "Brake Kits", PartName = "Autospecialty Front and Rear Replacement Brake Kit-OE Brake Rotors & Ceramic Brake Pads", UnitPrice = 315.27, ImageFile = "308113.png" };
            AutoParts[9]  = new AutoPart() { PartNumber = 799428, Year = 2012, Make = "Cadillac",  Model = "XTS", Category = "Bearings & Seals", PartName = "Front/Rear Wheel Hub Bearing Assembly 5 Lugs w/ABS", UnitPrice = 79.97, ImageFile = "799428.png" };
            AutoParts[10] = new AutoPart() { PartNumber = 648203, Year = 2018, Make = "Honda",     Model = "CRV", Category = "Alternator", PartName = "Alternator", UnitPrice = 202.47, ImageFile = "593804.png" };
            AutoParts[11] = new AutoPart() { PartNumber = 148073, Year = 2011, Make = "Chrysler",  Model = "s200", Category = "Starters", PartName = "DB Electrical SND0775 Starter", UnitPrice = 94.48, ImageFile = "148073.png" };
            AutoParts[12] = new AutoPart() { PartNumber = 308113, Year = 2017, Make = "Buick",     Model = "Enclave", Category = "Brake Kits", PartName = "Autospecialty Front and Rear Replacement Brake Kit-OE Brake Rotors & Ceramic Brake Pads", UnitPrice = 315.27, ImageFile = "308113.png" };
            AutoParts[13] = new AutoPart() { PartNumber = 938475, Year = 2010, Make = "Chrysler",  Model = "Sebring", Category = "Starters", PartName = "DB Electrical SMT0343 Starter", UnitPrice = 82.66, ImageFile = "938475.png" };
            AutoParts[14] = new AutoPart() { PartNumber = 502853, Year = 2014, Make = "GMC",       Model = "Terrain", Category = "Bearings & Seals", PartName = "Wheel Hub Bearing Assembly", UnitPrice = 48.85, ImageFile = "927944.png" };
            AutoParts[15] = new AutoPart() { PartNumber = 520384, Year = 2020, Make = "Jeep",      Model = "Wrangler Unlimited Sahara", Category = "Drum Brake", PartName = "Rear Dynamic Friction Company True-Arc Brake Shoes", UnitPrice = 42.22, ImageFile = "928037.png" };
            AutoParts[16] = new AutoPart() { PartNumber = 727394, Year = 2018, Make = "Toyota",    Model = "Corolla SE 1.8L L4 Gas", Category = "Alternators", PartName = "DB Electrical 400-40169 Alternator Compatible With/Replacement For 125 Internal Fan Type Decoupler Pulley Type Internal Regulator CW Rotation", UnitPrice = 215.84, ImageFile = "727394.png" };
            AutoParts[17] = new AutoPart() { PartNumber = 483804, Year = 2011, Make = "Chrysler",  Model = "Town & Country 3.3L", Category = "Alternators & Generators", PartName = "", UnitPrice = 118.37, ImageFile = "148040.png" };
            AutoParts[18] = new AutoPart() { PartNumber = 927944, Year = 2017, Make = "Chevrolet", Model = "Equinox", Category = "Bearings & Seals", PartName = "Wheel Hub Bearing Assembly", UnitPrice = 48.85, ImageFile = "927944.png" };
            AutoParts[19] = new AutoPart() { PartNumber = 208497, Year = 2009, Make = "Dodge",     Model = "Grand Caravan", Category = "Alternators", PartName = "Alternator", UnitPrice = 114.46, ImageFile = "503502.png" };
            AutoParts[20] = new AutoPart() { PartNumber = 749471, Year = 2019, Make = "Toyota",    Model = "Prius", Category = "Shocks, Struts & Suspension", PartName = "2-Piece Suspension Strut and Coil Spring Kit (593024)", UnitPrice = 299.97, ImageFile = "593024.png" };
            AutoParts[21] = new AutoPart() { PartNumber = 957724, Year = 2016, Make = "Chrysler",  Model = "s200", Category = "Starters", PartName = "DB Electrical SND0775 Starter", UnitPrice = 94.48, ImageFile = "148073.png" };
            AutoParts[22] = new AutoPart() { PartNumber = 397930, Year = 2008, Make = "Buick",     Model = "Enclave", Category = "Brake Kits", PartName = "Autospecialty Front and Rear Replacement Brake Kit-OE Brake Rotors & Ceramic Brake Pads", UnitPrice = 315.27, ImageFile = "308113.png" };
            AutoParts[23] = new AutoPart() { PartNumber = 927307, Year = 2014, Make = "Buick",     Model = "Regal", Category = "Alternators & Generators", PartName = "DB Electrical Alternator", UnitPrice = 218.74, ImageFile = "928037.png" };
            AutoParts[24] = new AutoPart() { PartNumber = 304031, Year = 2017, Make = "Chevrolet", Model = "Express 2500", Category = "Shocks, Struts & Suspension", PartName = "Suspension Kit (Front; with 3 Groove Pitman Arm)", UnitPrice = 142.44, ImageFile = "304031.png" };
            AutoParts[25] = new AutoPart() { PartNumber = 497249, Year = 2013, Make = "GMC",       Model = "Sierra 1500", Category = "Drum Brake", PartName = "ACDelco Gold 17960BF1 Bonded Rear Drum Brake Shoe Set", UnitPrice = 58.92, ImageFile = "497249.png" };
            AutoParts[26] = new AutoPart() { PartNumber = 973947, Year = 2012, Make = "Honda",     Model = "Accord", Category = "Brake Kits", PartName = "R1 Concepts Front Rear Brakes and Rotors Kit |Front Rear Brake Pads| Brake Rotors and Pads| Ceramic Brake Pads and Rotors", UnitPrice = 292.84, ImageFile = "973947.png" };
            AutoParts[27] = new AutoPart() { PartNumber = 868050, Year = 2010, Make = "Dodge",     Model = "Avenger", Category = "Starters", PartName = "DB Electrical SMT0343 Starter", UnitPrice = 82.66, ImageFile = "938475.png" };
            AutoParts[28] = new AutoPart() { PartNumber = 182694, Year = 2016, Make = "Chevrolet", Model = "Impala", Category = "Bearings & Seals", PartName = "Wheel Hub Bearing Assembly", UnitPrice = 48.85, ImageFile = "927944.png" };
            AutoParts[29] = new AutoPart() { PartNumber = 209246, Year = 2013, Make = "Chevrolet", Model = "Silverado 1500", Category = "Drum Brake", PartName = "ACDelco Gold 17960BF1 Bonded Rear Drum Brake Shoe Set", UnitPrice = 58.92, ImageFile = "497249.png" };

            cbxYears.Items.Add(2023.ToString());
            cbxYears.Items.Add(2022.ToString());
            cbxYears.Items.Add(2021.ToString());
            cbxYears.Items.Add(2020.ToString());
            cbxYears.Items.Add(2019.ToString());
            cbxYears.Items.Add(2018.ToString());
            cbxYears.Items.Add(2017.ToString());
            cbxYears.Items.Add(2016.ToString());
            cbxYears.Items.Add(2015.ToString());
            cbxYears.Items.Add(2014.ToString());
            cbxYears.Items.Add(2013.ToString());
            cbxYears.Items.Add(2012.ToString());
            cbxYears.Items.Add(2011.ToString());
            cbxYears.Items.Add(2010.ToString());
            cbxYears.Items.Add(2009.ToString());
            cbxYears.Items.Add(2008.ToString());
        }

        private void cbxYears_SelectedIndexChanged(object sender, EventArgs e)
        {
            cbxMakes.Items.Clear();
            cbxModels.Items.Clear();
            cbxCategories.Items.Clear();
            txtPartName.Text  = string.Empty;
            txtUnitPrice.Text = string.Empty;

            foreach (AutoPart part in AutoParts)
            {
                if (!(cbxMakes.Items.Contains(part.Make)))
                {
                    cbxMakes.Items.Add(part.Make);
                }
            }
        }

        private void cbxMakes_SelectedIndexChanged(object sender, EventArgs e)
        {
            cbxModels.Items.Clear();
            cbxCategories.Items.Clear();
            txtPartName.Text  = string.Empty;
            txtUnitPrice.Text = string.Empty;

            foreach (AutoPart part in AutoParts)
            {
                if( (part.Year.ToString().Equals(cbxYears.Text)) &&
                    (part.Make!.Equals(cbxMakes.Text)) )
                {
                    if (!(cbxModels.Items.Contains(part.Model)))
                    {
                        cbxModels.Items.Add(part.Model);
                    }
                }
            }
        }

        private void cbxModels_SelectedIndexChanged(object sender, EventArgs e)
        {
            cbxCategories.Items.Clear();
            txtPartName.Text  = string.Empty;
            txtUnitPrice.Text = string.Empty;

            foreach (AutoPart part in AutoParts)
            {
                if( (part.Year.ToString().Equals(cbxYears.Text)) &&
                    (part.Make!.Equals(cbxMakes.Text)) &&
                    (part.Model!.Equals(cbxModels.Text)) )
                {
                    if (!(cbxCategories.Items.Contains(part.Category)))
                    {
                        cbxCategories.Items.Add(part.Category);
                    }
                }
            }
        }

        private void cbxCategories_SelectedIndexChanged(object sender, EventArgs e)
        {
            foreach (AutoPart part in AutoParts)
            {
                if( (part.Year.ToString().Equals(cbxYears.Text)) && 
                    (part.Make!.Equals(cbxMakes.Text)) &&
                    (part.Model!.Equals(cbxModels.Text)) &&
                    (part.Category!.Equals(cbxCategories.Text)))
                {
                    txtPartName.Text  = part.PartName;
                    txtUnitPrice.Text = part.UnitPrice.ToString("F");
                    pbxAutoPart.Image = Image.FromFile(@"E:\College Park Auto-Parts\" + part.ImageFile);

                    Width  = pbxAutoPart.Left + pbxAutoPart.Image.Width + 50;
                    Height = pbxAutoPart.Top + pbxAutoPart.Image.Height + 80;
                }
            }
        }
    }
}
  17. To execute the project, press Ctrl + F5

    College Park Auto-Parts - Parts Inventory

  18. Make some selections in the combo boxes:

    College Park Auto-Parts - Parts Inventory

    College Park Auto-Parts - Parts Inventory

  19. Close the form and return to your programming environment

Composite Lists-Based Controls

An Image List

An image list is a list of image that are put together to be use by an application in a particular manner. The images are put together as an array where each picture occupies a specific index and can therefore be located with that index.

To support image lists, the .NET Framework provides a class named ImageList. You can use it to programmatically create an image list. To visually create an image list, click the ImageList button in the Toolbox and click a form on the application. An image list is not a visual control. Therefore, when you visually add an ImageList to a form, the icon of that object is positioned below the form.

If you had programmatically created an ImageList, you can configure it with code. After visually adding an image list to a form, you can configure it using the Properties window. Either way, the most important action to take is to add images to the object. To support this, the ImageList class is equipped with a property named Images .

List Views

We saw that a list box holds a vertical series of items, one item at a time. A list view is an enhanced version of a list box. While each item in a list box contain one value, in a list view, each item is one or more values. To organise a list view, its items are divided in columns. As a programmer, you have many options to define how the list box should display its items.

To help you with list views, the Toolbox has a button marked ListView. To create a list view, click that button and click a form or other container in your application. The characteristics of a list view are specified in a class named ListView. All the characteristics are available in the Properties window.

Practical LearningPractical Learning: Returning a Tuple

  1. To start a new application, on the main menu of Microsoft Visual Studio, click File -> New -> Project...
  2. Create a Windows Forms App named AutoPartsInventory3
  3. In the Solution Explorer, right-click Form1.cs -> Rename
  4. Type AutoPartsInventory (to get AutoPartsInventory.cs) and press Enter twice
  5. In the Toolbox, click the ListView button and click the form
  6. On the form, right-click the list view and click Edit Columns...
  7. Create the columns as follows:
    (Name) Text TextAlign Width
    colPartNumber Part #   80
    colCategory Item Category   250
    colPartName Part Name/Description   700
    colUnitPrice Unit Price Right 100
  8. Click OK
  9. Complete the design of the form as follows:

    Displaying a Picture in a Control

    Control (Name) Other Properties
    ListView List View lvwAutoParts FullRowSelect: True
    GridLines: True
    View: Details
    PictureBox List View pbxAutoPart BorderStyle: FixedSingle
    SizeMode: AutoSize
  10. Double-click an unoccupied area of the form
  11. Return to the form and click the list view
  12. In the Properties window, click the Events button Events
  13. In the Events section of the Properties window, double-click ItemSelectionChanged
  14. Change the document as follows: 
    namespace AutoPartsInventory3
{
    public partial class AutoPartsInventory : Form
    {
        public AutoPartsInventory()
        {
            InitializeComponent();
        }

        private void AutoPartsInventory_Load(object sender, EventArgs e)
        {
            ListViewItem lviAutoPart = new ListViewItem(148040.ToString());
            
            lviAutoPart.SubItems.Add("Alternators & Generators");
            lviAutoPart.SubItems.Add("Alternator");
            lviAutoPart.SubItems.Add(118.37.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(730283.ToString());

            lviAutoPart.SubItems.Add("Oil Filters");
            lviAutoPart.SubItems.Add("Hydraulic Cylinder Timing Belt Tensioner");
            lviAutoPart.SubItems.Add(14.15.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(727394.ToString());
            
            lviAutoPart.SubItems.Add("Alternators");
            lviAutoPart.SubItems.Add("DB Electrical 400-40169 Alternator Compatible With/Replacement For 125 Internal Fan Type Decoupler Pulley Type Internal Regulator CW Rotation");
            lviAutoPart.SubItems.Add(215.84.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(290741.ToString());
            
            lviAutoPart.SubItems.Add("Shocks, Struts & Suspension");
            lviAutoPart.SubItems.Add("Front Strut and Coil Spring Assembly - Set of 2");
            lviAutoPart.SubItems.Add(245.68.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(740248.ToString());
            
            lviAutoPart.SubItems.Add("Bearings & Seals");
            lviAutoPart.SubItems.Add("Wheel hub bearing Assembly");
            lviAutoPart.SubItems.Add(99.95.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(308113.ToString());
            
            lviAutoPart.SubItems.Add("Brake Kits");
            lviAutoPart.SubItems.Add("Autospecialty Front and Rear Replacement Brake Kit-OE Brake Rotors & Ceramic Brake Pads");
            lviAutoPart.SubItems.Add(315.27.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(283759.ToString());
            
            lviAutoPart.SubItems.Add("Starters");
            lviAutoPart.SubItems.Add("DB Electrical SND0787 Starter");
            lviAutoPart.SubItems.Add(212.58.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(503502.ToString());
            
            lviAutoPart.SubItems.Add("Alternators");
            lviAutoPart.SubItems.Add("Alternator");
            lviAutoPart.SubItems.Add(114.46.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(799428.ToString());
            
            lviAutoPart.SubItems.Add("Bearings & Seals");
            lviAutoPart.SubItems.Add("Front/Rear Wheel Hub Bearing Assembly 5 Lugs w/ABS");
            lviAutoPart.SubItems.Add(79.97.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(148073.ToString());
            
            lviAutoPart.SubItems.Add("Starters");
            lviAutoPart.SubItems.Add("DB Electrical SND0775 Starter");
            lviAutoPart.SubItems.Add(94.48.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(938475.ToString());
            
            lviAutoPart.SubItems.Add("Starters");
            lviAutoPart.SubItems.Add("DB Electrical SMT0343 Starter");
            lviAutoPart.SubItems.Add(82.66.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(520384.ToString());

            lviAutoPart.SubItems.Add("Drum Brake");
            lviAutoPart.SubItems.Add("Rear Dynamic Friction Company True-Arc Brake Shoes");
            lviAutoPart.SubItems.Add(42.22.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(927944.ToString());
            
            lviAutoPart.SubItems.Add("Bearings & Seals");
            lviAutoPart.SubItems.Add("Wheel Hub Bearing Assembly");
            lviAutoPart.SubItems.Add(48.85.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(304031.ToString());
            
            lviAutoPart.SubItems.Add("Shocks, Struts & Suspension");
            lviAutoPart.SubItems.Add("Suspension Kit (Front; with 3 Groove Pitman Arm)");
            lviAutoPart.SubItems.Add(142.44.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
            
            lviAutoPart = new ListViewItem(497249.ToString());
            
            lviAutoPart.SubItems.Add("Drum Brake");
            lviAutoPart.SubItems.Add("ACDelco Gold 17960BF1 Bonded Rear Drum Brake Shoe Set");
            lviAutoPart.SubItems.Add(58.92.ToString("F"));
            lvwAutoParts.Items.Add(lviAutoPart);
        }

        private void lvwAutoParts_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e)
        {
            pbxAutoPart.Image = Image.FromFile(@"C:\College Park Auto-Parts\" + e.Item!.Text + ".png");

            Width = pbxAutoPart.Left + pbxAutoPart.Image.Width + 40;
            Height = pbxAutoPart.Top + pbxAutoPart.Image.Height + 80;
        }
    }
}
  15. To execute, on the main menu, click Debug -> Start Without Debugging:

    College Park Auto-Parts - Parts Inventory

  16. Click different items on the list view:

    College Park Auto-Parts - Parts Inventory

    College Park Auto-Parts - Parts Inventory

  17. Close the form and return to Microsoft Visual Studio

Tree Views

A tree view is a control that holds a list that resembles a tree. It has a beginning, also called a root. That root has one or more dependencies as branches and leaves. These are referred to as nodes. The root and nodes have buttons that allow a user to expand or collapse a section.

To allow you to create a tree view, the .NET Framework provides a class named TreeView. To allow you to graphically add a tree view to your application, the Toolbox is equipped with a button titled TreeView. You can click that button and click a form or your application.

After adding a tree view to a form, you can configure its behavior. For example, you use the Properties window to add and configure the columns. In the same way, you can visually or programmatically create the tree nodes. Here are examples:

namespace AutoPartsInventory4
{
    public partial class AutoPartsInventory : Form
    {
        public AutoPartsInventory()
        {
            InitializeComponent();
        }

        private void AutoPartsInventory_Load(object sender, EventArgs e)
        {
            TreeNode nodRoot = tvwAutoParts.Nodes.Add("College Park Auto-Parts", "College Park Auto-Parts", 0, 1);

            TreeNode nodChild = nodRoot.Nodes.Add("2016", "2016", 2, 3);
            TreeNode nodGrandChild = nodChild.Nodes.Add("Buick", "Buick", 4, 5);
            TreeNode nodGrandGrandChild = nodGrandChild.Nodes.Add("Encore", "Encore", 6, 7);
            nodGrandGrandChild.Nodes.Add("Brake Kits", "Brake Kits", 8, 9);

            nodGrandChild = nodChild.Nodes.Add("Honda", "Honda", 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add("CR-Z", "CR-Z", 6, 7);
            nodGrandGrandChild.Nodes.Add("Brake Kits", "Brake Kits", 8, 9);

            nodChild = nodRoot.Nodes.Add("2015", "2015", 2, 3);
            nodGrandChild = nodChild.Nodes.Add("Ford", "Ford", 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add("F-150 4WD", "F-150 4WD", 6, 7);
            nodGrandGrandChild.Nodes.Add("Wheel Bearing Hub", "Wheel Bearing Hub", 8, 9);

            nodChild = nodRoot.Nodes.Add("2014", "2014", 2, 3);
            nodGrandChild = nodChild.Nodes.Add("Acura", "Acura", 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add("ILX 2.0L", "ILX 2.0L", 6, 7);
            nodGrandGrandChild.Nodes.Add("Brake Kits", "Brake Kits", 8, 9);

            nodGrandChild = nodChild.Nodes.Add("Honda", "Honda", 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add("ILX 2.0L", "ILX 2.0L", 6, 7);
            nodGrandGrandChild.Nodes.Add("Brake Kits", "Brake Kits", 8, 9);

            nodChild = nodRoot.Nodes.Add("2013", "2013", 2, 3);

            nodGrandChild = nodChild.Nodes.Add("Honda", "Honda", 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add("Accord Coupe LX-S 4 Cyl.", "Accord Coupe LX-S 4 Cyl.", 6, 7);
            nodGrandGrandChild.Nodes.Add("Wheel Bearing", "Wheel Bearing", 8, 9);

            nodChild = nodRoot.Nodes.Add("2012", "2012", 2, 3);
            nodGrandChild = nodChild.Nodes.Add("Honda", "Honda", 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add("Civic Sedan EX", "Civic Sedan EX", 6, 7);
            nodGrandGrandChild.Nodes.Add("Brake Kits", "Brake Kits", 8, 9);

            tvwAutoParts.SelectedNode = nodRoot;

            // Expand the root node
            tvwAutoParts.ExpandAll();
        }
    }
}

This would produce:

College Park Auto-Parts

ApplicationPractical Learning: Introducing Else Conditions

  1. Start a new Windows Forms App application named AutoPartsInventory4
  2. In the Solution Explorer, right-click AutoPartsInventory3 -> New -> Folder
  3. Type Models as the name of the folder
  4. In the Solution Explorer, right-click Models -> Add -> Class...
  5. Type AutoPart as the name of the class
  6. Press Enter
  7. Change the document as follows: 
    namespace AutoPartsInventory4.Models
{
    internal record struct AutoPart
    {
        public long    PartNumber { get; init; }
        public int     Year       { get; init; }
        public string? Make       { get; init; }
        public string? Model      { get; init; }
        public string? Category   { get; init; }
        public string? PartName   { get; init; }
        public double UnitPrice   { get; init; }
        public string? ImageFile  { get; init; }
    }
}
  8. In the Solution Explorer, right-click Form1.cs and click Rename
  9. Type AutoPartsInventory (to get AutoPartsInventory.cs) and press Enter twice
  10. In the Toolbox, click the ListView button and click the form
  11. On the form, right-click the list view and click Edit Columns...
  12. Create the columns as follows:
    (Name) Text TextAlign Width
    colPartNumber Part #   100
    colPartName Part Name/Description   700
    colUnitPrice Unit Price Right 100
  13. Click OK
  14. In the Toolbox, expand the Components section and click ImageList
  15. Click the form
  16. While the image list is selected below the form, in the Properties window, click (Name) and type imgAutoParts and press Enter
  17. Still in the Properties window for the image list, click Images and click its Images button
  18. Continuously click the Add button. Add , , Plus, Minus, Ruler, Ruler, Graph, Graph, Tool, and Tool
  19. Complete the design of the form as follows:

    College Park Auto-Parts - Parts Inventory

    Control (Name) Text Other Properties
    Label Label   College Park Auto-Parts Font: Times New Roman, 36pt, style=Bold
    ForeColo: Blue
    Label Label     BackColor: Maroon
    AutoSize: False
    Label Label   Part Identification _______  
    TreeView Tree View tvwAutoParts   ImageList: imgAutoParts
    Button Combo Box btnClose Close Font: Times New Roman, 48pt, style=Bold
    ListView List View lvwAutoParts   FullRowSelect: True
    GridLines: True
    View: Details
    PictureBox Picture Box pbxAutoPart   BorderStyle: FixedSingle
    SizeMode: AutoSize
  20. Double-click an unoccupied area of the form to launch its Load event
  21. Return to the form and click the tree view on the form
  22. In the Properties window, click the Events button Events
  23. In the Events section of the Properties window, double-click the NodeMouseClick field
  24. Return to the form and click the list view on the form
  25. In the Events section of the Properties window, double-click ItemSelectionChanged
  26. Return to the form and double-click the Close button
  27. Change the document as follows: 
    using AutoPartsInventory4.Models;

namespace AutoPartsInventory4
{
    public partial class AutoPartsInventory : Form
    {
        internal AutoPart[] AutoParts { get; set; } = new AutoPart[32];

        public AutoPartsInventory()
        {
            InitializeComponent();
        }

        private void AutoPartsInventory_Load(object sender, EventArgs e)
        {
            TreeNode nodRoot = tvwAutoParts.Nodes.Add("College Park Auto-Parts", "College Park Auto-Parts", 0, 1);

            AutoParts[0]  = new AutoPart() { PartNumber = 393795, Year = 2015, Make = "Buick",     Model = "Regal", Category = "Alternators & Generators", PartName = "DB Electrical Alternator", UnitPrice = 218.74, ImageFile = "928037.png" };
            AutoParts[1]  = new AutoPart() { PartNumber = 928374, Year = 2018, Make = "Chevrolet", Model = "Express 3500", Category = "Shocks, Struts & Suspension", PartName = "Suspension Kit (Front; with 3 Groove Pitman Arm)", UnitPrice = 142.44, ImageFile = "304031.png" };
            AutoParts[2]  = new AutoPart() { PartNumber = 148040, Year = 2010, Make = "Chrysler",  Model = "Town & Country 3.8L", Category = "Alternators & Generators", PartName = "Alternator", UnitPrice = 118.37, ImageFile = "148040.png" };
            AutoParts[3]  = new AutoPart() { PartNumber = 730283, Year = 2020, Make = "Jeep",      Model = "Wrangler Unlimited Sahara", Category = "Oil Filters", PartName = "Hydraulic Cylinder Timing Belt Tensioner", UnitPrice = 14.15, ImageFile = "730283.png" };
            AutoParts[4]  = new AutoPart() { PartNumber = 290741, Year = 2015, Make = "Ford",      Model = "F-150 XL 3.5L V6 Flex Regular Cab 2 Full-Size Doors", Category = "Shocks, Struts & Suspension", PartName = "Front Strut and Coil Spring Assembly - Set of 2", UnitPrice = 245.68, ImageFile = "290741.png" };
            AutoParts[5]  = new AutoPart() { PartNumber = 740248, Year = 2013, Make = "Chevrolet", Model = "Equinox", Category = "Bearings & Seals", PartName = "Wheel hub bearing Assembly", UnitPrice = 99.95, ImageFile = "740248.png" };
            AutoParts[6]  = new AutoPart() { PartNumber = 283759, Year = 2012, Make = "Dodge",     Model = "Charger 3.6L", Category = "Starters", PartName = "DB Electrical SND0787 Starter", UnitPrice = 212.58, ImageFile = "283759.png" };
            AutoParts[7]  = new AutoPart() { PartNumber = 503502, Year = 2008, Make = "Jeep",      Model = "Wrangler", Category = "Alternators", PartName = "Alternator", UnitPrice = 114.46, ImageFile = "503502.png" };
            AutoParts[8]  = new AutoPart() { PartNumber = 130338, Year = 2011, Make = "Buick",     Model = "Enclave", Category = "Brake Kits", PartName = "Autospecialty Front and Rear Replacement Brake Kit-OE Brake Rotors & Ceramic Brake Pads", UnitPrice = 315.27, ImageFile = "308113.png" };
            AutoParts[9]  = new AutoPart() { PartNumber = 799428, Year = 2012, Make = "Cadillac",  Model = "XTS", Category = "Bearings & Seals", PartName = "Front/Rear Wheel Hub Bearing Assembly 5 Lugs w/ABS", UnitPrice = 79.97, ImageFile = "799428.png" };
            AutoParts[10] = new AutoPart() { PartNumber = 648203, Year = 2018, Make = "Honda",     Model = "CRV", Category = "Alternator", PartName = "Alternator", UnitPrice = 202.47, ImageFile = "593804.png" };
            AutoParts[11] = new AutoPart() { PartNumber = 148073, Year = 2011, Make = "Chrysler",  Model = "s200", Category = "Starters", PartName = "DB Electrical SND0775 Starter", UnitPrice = 94.48, ImageFile = "148073.png" };
            AutoParts[12] = new AutoPart() { PartNumber = 308113, Year = 2017, Make = "Buick",     Model = "Enclave", Category = "Brake Kits", PartName = "Autospecialty Front and Rear Replacement Brake Kit-OE Brake Rotors & Ceramic Brake Pads", UnitPrice = 315.27, ImageFile = "308113.png" };
            AutoParts[13] = new AutoPart() { PartNumber = 938475, Year = 2010, Make = "Chrysler",  Model = "Sebring", Category = "Starters", PartName = "DB Electrical SMT0343 Starter", UnitPrice = 82.66, ImageFile = "938475.png" };
            AutoParts[14] = new AutoPart() { PartNumber = 502853, Year = 2014, Make = "GMC",       Model = "Terrain", Category = "Bearings & Seals", PartName = "Wheel Hub Bearing Assembly", UnitPrice = 48.85, ImageFile = "927944.png" };
            AutoParts[15] = new AutoPart() { PartNumber = 520384, Year = 2020, Make = "Jeep",      Model = "Wrangler Unlimited Sahara", Category = "Drum Brake", PartName = "Rear Dynamic Friction Company True-Arc Brake Shoes", UnitPrice = 42.22, ImageFile = "520384.png" };
            AutoParts[16] = new AutoPart() { PartNumber = 727394, Year = 2018, Make = "Toyota",    Model = "Corolla SE 1.8L L4 Gas", Category = "Alternators", PartName = "DB Electrical 400-40169 Alternator Compatible With/Replacement For 125 Internal Fan Type Decoupler Pulley Type Internal Regulator CW Rotation", UnitPrice = 215.84, ImageFile = "727394.png" };
            AutoParts[17] = new AutoPart() { PartNumber = 483804, Year = 2011, Make = "Chrysler",  Model = "Town & Country 3.3L", Category = "Alternators & Generators", PartName = "Electrical Alternator", UnitPrice = 118.37, ImageFile = "148040.png" };
            AutoParts[18] = new AutoPart() { PartNumber = 927944, Year = 2017, Make = "Chevrolet", Model = "Equinox", Category = "Bearings & Seals", PartName = "Wheel Hub Bearing Assembly", UnitPrice = 48.85, ImageFile = "927944.png" };
            AutoParts[19] = new AutoPart() { PartNumber = 208497, Year = 2009, Make = "Dodge",     Model = "Grand Caravan", Category = "Alternators", PartName = "Alternator", UnitPrice = 114.46, ImageFile = "503502.png" };
            AutoParts[20] = new AutoPart() { PartNumber = 749471, Year = 2019, Make = "Toyota",    Model = "Prius", Category = "Shocks, Struts & Suspension", PartName = "2-Piece Suspension Strut and Coil Spring Kit (593024)", UnitPrice = 299.97, ImageFile = "593024.png" };
            AutoParts[21] = new AutoPart() { PartNumber = 957724, Year = 2016, Make = "Chrysler",  Model = "s200", Category = "Starters", PartName = "DB Electrical SND0775 Starter", UnitPrice = 94.48, ImageFile = "148073.png" };
            AutoParts[22] = new AutoPart() { PartNumber = 397930, Year = 2008, Make = "Buick",     Model = "Enclave", Category = "Brake Kits", PartName = "Autospecialty Front and Rear Replacement Brake Kit-OE Brake Rotors & Ceramic Brake Pads", UnitPrice = 315.27, ImageFile = "308113.png" };
            AutoParts[23] = new AutoPart() { PartNumber = 927307, Year = 2014, Make = "Buick",     Model = "Regal", Category = "Alternators & Generators", PartName = "DB Electrical Alternator", UnitPrice = 218.74, ImageFile = "928037.png" };
            AutoParts[24] = new AutoPart() { PartNumber = 304031, Year = 2017, Make = "Chevrolet", Model = "Express 2500",   Category = "Shocks, Struts & Suspension", PartName = "Suspension Kit (Front; with 3 Groove Pitman Arm)", UnitPrice = 142.44, ImageFile = "304031.png" };
            AutoParts[25] = new AutoPart() { PartNumber = 497249, Year = 2013, Make = "GMC",       Model = "Sierra 1500",    Category = "Drum Brake", PartName = "ACDelco Gold 17960BF1 Bonded Rear Drum Brake Shoe Set", UnitPrice = 58.92, ImageFile = "497249.png" };
            AutoParts[26] = new AutoPart() { PartNumber = 973947, Year = 2012, Make = "Honda",     Model = "Accord",         Category = "Brake Kits", PartName = "R1 Concepts Front Rear Brakes and Rotors Kit |Front Rear Brake Pads| Brake Rotors and Pads| Ceramic Brake Pads and Rotors", UnitPrice = 292.84, ImageFile = "973947.png" };
            AutoParts[27] = new AutoPart() { PartNumber = 868050, Year = 2010, Make = "Dodge",     Model = "Avenger",        Category = "Starters", PartName = "DB Electrical SMT0343 Starter", UnitPrice = 82.66, ImageFile = "938475.png" };
            AutoParts[28] = new AutoPart() { PartNumber = 182694, Year = 2016, Make = "Chevrolet", Model = "Impala",         Category = "Bearings & Seals", PartName = "Wheel Hub Bearing Assembly", UnitPrice = 48.85, ImageFile = "927944.png" };
            AutoParts[29] = new AutoPart() { PartNumber = 209246, Year = 2013, Make = "Chevrolet", Model = "Silverado 1500", Category = "Drum Brake", PartName = "ACDelco Gold 17960BF1 Bonded Rear Drum Brake Shoe Set", UnitPrice = 58.92, ImageFile = "497249.png" };
            AutoParts[30] = new AutoPart() { PartNumber = 928037, Year = 2017, Make = "Buick",     Model = "Regal",          Category = "Alternators & Generators", PartName = "DB Electrical Alternator", UnitPrice = 218.74, ImageFile = "928037.png" };
            AutoParts[31] = new AutoPart() { PartNumber = 297149, Year = 2020, Make = "Jeep",      Model = "Wrangler",       Category = "Air Filters", PartName = "ACDelco Gold A3408C Air Filter", UnitPrice = 22.83, ImageFile = "297149.png" };

            nodRoot.Nodes.Add("2024", "2024", 2, 3);
            nodRoot.Nodes.Add("2023", "2023", 2, 3);
            nodRoot.Nodes.Add("2022", "2022", 2, 3);
            nodRoot.Nodes.Add("2021", "2021", 2, 3);

            tvwAutoParts.ExpandAll();

            TreeNode nodChild = nodRoot.Nodes.Add("2020", "2020", 2, 3);

            TreeNode nodGrandChild = nodChild.Nodes.Add(AutoParts[31].Make, AutoParts[31].Make, 4, 5);
            TreeNode nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[31].Model, AutoParts[31].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[31].Category, AutoParts[31].Category, 8, 9);

            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[15].Model, AutoParts[15].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[15].Category, AutoParts[15].Category, 8, 9);

            nodGrandGrandChild.Nodes.Add(AutoParts[3].Category, AutoParts[3].Category, 8, 9);
            
            nodChild = nodRoot.Nodes.Add("2019", "2019", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[20].Make, AutoParts[20].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[20].Model, AutoParts[20].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[20].Category, AutoParts[20].Category, 8, 9);
            
            nodChild = nodRoot.Nodes.Add("2018", "2018", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[16].Make, AutoParts[16].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[16].Model, AutoParts[16].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[16].Category, AutoParts[16].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[1].Make, AutoParts[1].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[1].Model, AutoParts[1].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[1].Category, AutoParts[1].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[10].Make, AutoParts[10].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[10].Model, AutoParts[10].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[10].Category, AutoParts[10].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2017", "2017", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[24].Make, AutoParts[24].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[24].Model, AutoParts[24].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[24].Category, AutoParts[24].Category, 8, 9);

            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[18].Model, AutoParts[18].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[18].Category, AutoParts[18].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[12].Make, AutoParts[12].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[12].Model, AutoParts[12].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[12].Category, AutoParts[12].Category, 8, 9);

            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[30].Model, AutoParts[30].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[30].Category, AutoParts[30].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2016", "2016", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[21].Make, AutoParts[21].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[21].Model, AutoParts[21].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[21].Category, AutoParts[21].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[28].Make, AutoParts[28].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[28].Model, AutoParts[28].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[28].Category, AutoParts[28].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2015", "2015", 2, 3);
            
            nodGrandChild = nodChild.Nodes.Add(AutoParts[4].Make, AutoParts[4].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[4].Model, AutoParts[4].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[4].Category, AutoParts[4].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[0].Make, AutoParts[0].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[0].Model, AutoParts[0].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[0].Category, AutoParts[0].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2014", "2014", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[23].Make, AutoParts[23].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[23].Model, AutoParts[23].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[23].Category, AutoParts[23].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[14].Make, AutoParts[14].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[14].Model, AutoParts[14].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[14].Category, AutoParts[14].Category, 8, 9);
            
            nodChild = nodRoot.Nodes.Add("2013", "2013", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[25].Make, AutoParts[25].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[25].Model, AutoParts[25].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[25].Category, AutoParts[25].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[5].Make, AutoParts[5].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[5].Model, AutoParts[5].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[5].Category, AutoParts[5].Category, 8, 9);

            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[29].Model, AutoParts[29].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[29].Category, AutoParts[29].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2012", "2012", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[9].Make, AutoParts[9].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[9].Model, AutoParts[9].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[9].Category, AutoParts[9].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[6].Make, AutoParts[6].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[6].Model, AutoParts[6].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[6].Category, AutoParts[6].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[26].Make, AutoParts[26].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[26].Model, AutoParts[26].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[26].Category, AutoParts[26].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2011", "2011", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[8].Make, AutoParts[8].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[8].Model, AutoParts[8].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[8].Category, AutoParts[8].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[11].Make, AutoParts[11].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[11].Model, AutoParts[11].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[11].Category, AutoParts[11].Category, 8, 9);

            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[17].Model, AutoParts[17].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[17].Category, AutoParts[17].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2010", "2010", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[27].Make, AutoParts[27].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[27].Model, AutoParts[27].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[27].Category, AutoParts[27].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[13].Make, AutoParts[13].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[13].Model, AutoParts[13].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[13].Category, AutoParts[13].Category, 8, 9);

            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[2].Model, AutoParts[2].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[2].Category, AutoParts[2].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2009", "2009", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[19].Make, AutoParts[19].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[19].Model, AutoParts[19].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[19].Category, AutoParts[19].Category, 8, 9);

            nodChild = nodRoot.Nodes.Add("2008", "2008", 2, 3);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[7].Make, AutoParts[7].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[7].Model, AutoParts[7].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[7].Category, AutoParts[7].Category, 8, 9);

            nodGrandChild = nodChild.Nodes.Add(AutoParts[22].Make, AutoParts[22].Make, 4, 5);
            nodGrandGrandChild = nodGrandChild.Nodes.Add(AutoParts[22].Model, AutoParts[22].Model, 6, 7);
            nodGrandGrandChild.Nodes.Add(AutoParts[22].Category, AutoParts[22].Category, 8, 9);

            tvwAutoParts.SelectedNode = nodRoot;
        }

        private void tvwAutoParts_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            TreeNode nodClicked = e.Node;

            if (nodClicked.Level == 4)
                lvwAutoParts.Items.Clear();

            try
            {
                foreach (AutoPart part in AutoParts)
                {
                    if ((part.Category == nodClicked.Text) &&
                        (part.Model == nodClicked.Parent.Text) &&
                        (part.Make == nodClicked.Parent.Parent.Text) &&
                        (part.Year.ToString() == nodClicked.Parent.Parent.Parent.Text))
                    {
                        ListViewItem lviAutoPart = new ListViewItem(part.PartNumber.ToString());

                        lviAutoPart.SubItems.Add(part.PartName);
                        lviAutoPart.SubItems.Add(part.UnitPrice.ToString("F"));
                        lvwAutoParts.Items.Add(lviAutoPart);
                    }
                }
            }
            catch (NullReferenceException)
            {
            }
        }

        private void lvwAutoParts_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e)
        {
            foreach (AutoPart part in AutoParts)
            {
                if (part.PartNumber == long.Parse(e.Item!.Text))
                {
                    pbxAutoPart.Image = Image.FromFile(@"E:\College Park Auto-Parts\" + part.ImageFile);

                    Width = pbxAutoPart.Left + pbxAutoPart.Image.Width + 40;
                    Height = pbxAutoPart.Top + pbxAutoPart.Image.Height + 80;
                }
            }
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}
  28. To execute, on the main menu, click Debug -> Start Without Debugging:

    College Park Auto-Parts - Parts Inventory

  29. Expand some nodes in the tree view and click part category
  30. In the list view, click an item:

    College Park Auto-Parts - Parts Inventory

    College Park Auto-Parts - Parts Inventory

  31. Close the form and return to your programming environment
  32. Close your programming environment
Previous Copyright © 2001-2024, FunctionX Sunday 07 May 2023, 14:00 Next