c# Delete key for listbox

Question

I have a listbox where i can delete items with a button but i want to also be able to delete with the delete key on my keyboard, I could not find a way on google so can someone please help me

Edit Its a winform application

This is the code for the delete button:

private void Button3Click(object sender, EventArgs e)
{
    var application = this.GetCurrentApplication();

    if (application == null)
    {
        MessageBox.Show("No Application selected");
        return;
    }

    if (MessageBox.Show("You are about to delete application: " + Environment.NewLine + _applicationListBox.SelectedItem + Environment.NewLine + "Are you sure you want to delete the application?", "", MessageBoxButtons.YesNo) == DialogResult.No)
    {
        MessageBox.Show("The application will not be deleted.", "", MessageBoxButtons.OK);
    }
    else if (this._applicationListBox.SelectedIndex >= 0)
    {
        int index = _applicationListBox.SelectedIndex;

        _toepassingIniFile.ToePassingen.Remove(application);
        if (index == _toepassingIniFile.ToePassingen.Count)
            --index;
        application = index < 0 ? null : _toepassingIniFile.ToePassingen[index];

        _toepassingIniFile.Save(application);

        _applicationListBox.DataSource = null;
        _applicationListBox.DataSource = _toepassingIniFile.ToePassingen;

        _applicationListBox.SelectedIndex = index;
    }
}

Answer thank to Jonesy

private void ApplicationListBoxPreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
    {
        if (e.KeyCode ==Keys.Delete )
        {
           deletefromlistbox();
        }
        if (e.KeyCode == Keys.Insert)
        {
            Refreshapplication();
        }

    }

Refreshapplication

private void Refreshapplication()
    {
        var newapplication = new NewApplication(_toepassingIniFile);
        if (newapplication.Run())
        {
            _applicationListBox.DataSource = null;
            _applicationListBox.DataSource = _toepassingIniFile.ToePassingen;
            _applicationListBox.SelectedIndex = _toepassingIniFile.ToePassingen.Count - 1;
            _controllercombobox.DataSource = null;
            _controllercombobox.DataSource = _controllerIniFile.Controllers;
        }
    }

add a previewkeydown event to the listbox. Then verify the key was Delete in the event handler — Jonesopolis, Jun 25 '13 at 14:07
Can you give some more context? Installed application? Web application? — Feasoron, Jun 25 '13 at 14:07
http://stackoverflow.com/questions/7855657/keyboard-shortcut-for-a-button — Gopesh Sharma, Jun 25 '13 at 14:08

score 8 · Accepted Answer · answered Jun 25 '13 at 14:13

8

applicationListBox.PreviewKeyDown +=new PreviewKeyDownEventHandler(applicationListBox_PreviewKeyDown);

then

void applicationListBox_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Delete)
    {
        //delete
    }
}

then do like msm8bball said and abstract out that code so both button click and previewkeydown call the delete method

answered Jun 25 '13 at 14:13

Jonesopolis

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It wasnt completly correct the correct answer should be in the question but thanks to you i figured it out – Jun 25 '13 at 14:46

score 0 · Answer 2 · answered Jun 25 '13 at 14:08

Abstract out your logic for the deletion into it's own function. Have Button3Click call this function.

Then, add a new function that handles deletion, and have it also call the new function. Use this event: http://msdn.microsoft.com/en-us/library/system.windows.forms.control.onpreviewkeydown.aspx

c# Delete key for listbox

2 Answers2