Access listbox item by double-click

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Hopefully this is a painfully simple question.

I have a listbox with 3 entries:

Dog
Cat
Fish

I have a string x.

When the user double-clicks on "Cat", I want a method/event handler to fire which sets x = "Cat". If they double-click on "Dog", I want x = "Dog".

Amazingly, I'm having a lot of trouble doing this. Just need a quick code sample.

Posted 7-Jan-12 17:50pm

CertNerd

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Sergey Alexandrovich Kryukov 8-Jan-12 0:17am

A lot of trouble? It's really amazing... and what kind of trouble do you have? Be so kind to share it with us, otherwise we won't be able to help you.
--SA

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OriginalGriff · Answer 1 · 2012-01-07T21:13:00

Solution 1

Handle the DoubleClick event for the listbox:

C#

private string x;
private void myListBox_DoubleClick(object sender, EventArgs e)
    {
    x = myListBox.SelectedItem.ToString();
    }

Posted 7-Jan-12 21:13pm

OriginalGriff

BillWoodruff · Answer 2 · 2012-01-07T22:58:00

I'm going to respond to your question on a little "broader" level (once an educator, always an educator ?) than just the how of you get a specific DoubleClick EventHandler "wired-up" to a specific ListBox.

First, what are your goals here:

1. what happens if the user only single-clicks on an entry in the ListBox, but that single-click changes the current SelectedIndex Property of that ListBox: does that potential change in selection by single-click "mean" anything in the context of your solution ?

Please note that ... sometimes .... depending on external variables, system settings, mouse-type, how fast you click, how worn-down your mouse-buttons are, etc., it's possible to "have trouble" getting a double-click Event.

Try this WinForm experiment: put a ListBox (here called 'listBox1), with the same three Items in it (Dog Cat Fish) you are using now, and add a large-sizedTextBox with 'Multi-Line set to 'true, and set to show a vertical scrollbar, named 'tbEventReport.

Add this code to the Form that contains the 'listBox1 ListBox, and the 'tbEventReport TextBox:

C#

    private int eventId;

    private void ReportEvent(string eventName)
    {
        tbEventReport.Text +=
            "Event ID ="
            + eventId
            + " : "
            + eventName
            + " : "
            + "Selected Index = "
            // note that use of 'ToString() is not required here ...
            + listBox1.SelectedIndex
            + Environment.NewLine
            + "-----------------------------------------------------------------------------------------------------"
            +Environment.NewLine;

        eventId++;
    }

    private void listBox1_MouseClick(object sender, MouseEventArgs e)
    {
        ReportEvent("MouseClick");
    }

    private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        ReportEvent("MouseDoubleClick");
    }

    private void listBox1_Click(object sender, EventArgs e)
    {
        ReportEvent("Click");
    }

    private void listBox1_DoubleClick(object sender, EventArgs e)
    {
        ReportEvent("DoubleClick");
    }

    private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        ReportEvent("SelectedIndexChanged");
    }
}

Do the right thing at design-time to "hook-up" those EventHandlers defined above to 'listBox1.

Then run the app, and experiment with clicking and double-clicking in a variety of ways: notice how clicking on the same item that's already selected still fires the SelectedIndexChanged EventHandler.

Getting "grounded" in the sequence and behavior of typical Mouse action generated Events will, I believe, equip you with a "mental toolkit" you can use to design many types of solution strategies in the future.