C# Listbox Item Double Click Event

问题:

I have a list box with some items. Is there anyway I can attach a double click event to each item?

Item 1
Item 2
Item 3

If i was to double click Item 2, a Messagebox saying "Item 2" would pop up

How would i do this?

回答1:

void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
    {
         int index = this.listBox1.IndexFromPoint(e.Location);
         if (index != System.Windows.Forms.ListBox.NoMatches)
            {
              MessageBox.Show(index.ToString());
            }
     }

This should work...check

回答2:

WinForms

Add an event handler for the Control.DoubleClick event for your ListBox, and in that event handler open up a MessageBox displaying the selected item.

E.g.:

 private void ListBox1_DoubleClick(object sender, EventArgs e)
 {
     if (ListBox1.SelectedItem != null)
     {
         MessageBox.Show(ListBox1.SelectedItem.ToString());
     }
 }

Where ListBox1 is the name of your ListBox.

Note that you would assign the event handler like this:

ListBox1.DoubleClick += new EventHandler(ListBox1_DoubleClick);

---

WPF
Pretty much the same as above, but you'd use the MouseDoubleClick event instead:

ListBox1.MouseDoubleClick += new RoutedEventHandler(ListBox1_MouseDoubleClick);

And the event handler:

 private void ListBox1_MouseDoubleClick(object sender, RoutedEventArgs e)
 {
     if (ListBox1.SelectedItem != null)
     {
         MessageBox.Show(ListBox1.SelectedItem.ToString());
     }
 }

---

Edit: Sisya's answer checks to see if the double-click occurred over an item, which would need to be incorporated into this code to fix the issue mentioned in the comments (MessageBox shown if ListBox is double-clicked while an item is selected, but not clicked over an item).

Hope this helps!

回答3:

I know this question is quite old, but I was looking for a solution to this problem too. The accepted solution is for WinForms not WPF which I think many who come here are looking for.

For anyone looking for a WPF solution, here is a great approach (via Oskar's answer here):

private void myListBox_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    DependencyObject obj = (DependencyObject)e.OriginalSource;

    while (obj != null && obj != myListBox)
    {
        if (obj.GetType() == typeof(ListBoxItem))
        {
             // Do something
             break;
         }
         obj = VisualTreeHelper.GetParent(obj);
    }
}

Basically, you walk up the VisualTree until you've either found a parent item that is a ListBoxItem, or you ascend up to the actual ListBox (and therefore did not click a ListBoxItem).

回答4:

For Winforms

private void listBox1_DoubleClick(object sender, MouseEventArgs e)
    {
        int index = this.listBox1.IndexFromPoint(e.Location);
        if (index != System.Windows.Forms.ListBox.NoMatches)
        {
            MessageBox.Show(listBox1.SelectedItem.ToString());
        }
    }

and

public Form()
{
    InitializeComponent();
    listBox1.MouseDoubleClick += new MouseEventHandler(listBox1_DoubleClick);
}

that should also, prevent for the event firing if you select an item then click on a blank area.

回答5:

I show you use Visual Studio,

what you can do for the same resualt that you want is in the listBox Properties-> Behavior->AutoPostBack change it to "True".

Hope that will help

回答6:

This is very old post but if anyone ran into similar problem and need quick answer:

• To capture if a ListBox item is clicked use MouseDown event.
• To capture if an item is clicked rather than empty space in list box check if listBox1.IndexFromPoint(new Point(e.X,e.Y))>=0
• To capture doubleclick event check if e.Clicks == 2