c# listview detect checkbox change

Question

I'm trying to detect when a checkbox in a listview is changed so I can change the colour of the background. I've searched in google and found examples but I can't get any of them to work so I created a new project and added an example from msdn to test but that didn't work either.

The code I used for testing is:

private void InitializeListView()
{
    this.ListView1 = new System.Windows.Forms.ListView();

    // Set properties such as BackColor and DockStyle and Location. 
    this.ListView1.BackColor = System.Drawing.SystemColors.Control;
    this.ListView1.Dock = System.Windows.Forms.DockStyle.Top;
    this.ListView1.Location = new System.Drawing.Point(0, 0);
    this.ListView1.Size = new System.Drawing.Size(292, 130);
    this.ListView1.View = System.Windows.Forms.View.Details;
    this.ListView1.HideSelection = false;

    // Allow the user to select multiple items. 
    this.ListView1.MultiSelect = true;

    // Show CheckBoxes in the ListView. 
    this.ListView1.CheckBoxes = true;

    //Set the column headers and populate the columns.
    ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable;

    ColumnHeader columnHeader1 = new ColumnHeader();
    columnHeader1.Text = "Breakfast Choices";
    columnHeader1.TextAlign = HorizontalAlignment.Left;
    columnHeader1.Width = 146;

    ColumnHeader columnHeader2 = new ColumnHeader();
    columnHeader2.Text = "Price Each";
    columnHeader2.TextAlign = HorizontalAlignment.Center;
    columnHeader2.Width = 142;

    this.ListView1.Columns.Add(columnHeader1);
    this.ListView1.Columns.Add(columnHeader2);

    string[] foodList = new string[]{"Juice", "Coffee", 
        "Cereal & Milk", "Fruit Plate", "Toast & Jelly", 
        "Bagel & Cream Cheese"};

    string[] foodPrice = new string[]{"1.09", "1.09", "2.19", 
        "2.79", "2.09", "2.69"};

    int count;

    // Members are added one at a time, so call BeginUpdate to ensure  
    // the list is painted only once, rather than as each list item is added.
    ListView1.BeginUpdate();

    for(count = 0; count < foodList.Length; count++)
    {
        ListViewItem listItem = new ListViewItem(foodList[count]);
        listItem.SubItems.Add(foodPrice[count]);
        ListView1.Items.Add(listItem);
    }

    //Call EndUpdate when you finish adding items to the ListView.
    ListView1.EndUpdate();
    this.Controls.Add(this.ListView1);
}

    public Form1()
    {
        InitializeComponent();
        InitializeListView();
    }

    double price = 0.0;

// Handles the ItemCheck event. The method uses the CurrentValue 
// property of the ItemCheckEventArgs to retrieve and tally the   
// price of the menu items selected.   
private void ListView1_ItemCheck1(object sender, 
    System.Windows.Forms.ItemCheckEventArgs e)
{
    if (e.CurrentValue==CheckState.Unchecked)
    {
        price += Double.Parse(
            this.ListView1.Items[e.Index].SubItems[1].Text);
    }
    else if((e.CurrentValue==CheckState.Checked))
    {
        price -= Double.Parse(
            this.ListView1.Items[e.Index].SubItems[1].Text);
    }

    // Output the price to TextBox1.
    TextBox1.Text = price.ToString();
}

I created a listview and textbox named correctly but it still didn't work.

Any help would be appreciated!

Please be more precise instead of writing "but it still didn't work" and decribe what it exactly appening. — user2284570
– user2284570, Commented Apr 7, 2014 at 21:22

Andy · Accepted Answer · 2020-11-02 13:39:41Z

3

The MSDN article says Ensure that the ItemCheck event is associated with the event handler in this example. That's missing in your code.

Add:

this.ListView1.ItemCheck += ListView1_ItemCheck1;

to InitializeListView.

edited Nov 2, 2020 at 13:39

answered Apr 7, 2014 at 21:08

Andy

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