问题:

private void screensaverWindow_Load(object sender, System.EventArgs e)
{            
    this.BringToFront();            
    this.Focus();
    this.KeyPreview = true;
    this.KeyDown += new KeyEventHandler(onkeyDown);            
}

onKeyDown() is never called. Any idea why?

EDIT: This works in release mode!? I guess it must be visual studio debugger interfering somewhere

回答1:

Seems to work for me:

public Form1()
{
    InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
    this.BringToFront();
    this.Focus();
    this.KeyPreview = true;
    this.KeyDown += new KeyEventHandler(Form1_KeyDown);
}

void Form1_KeyDown(object sender, KeyEventArgs e)
{
    Console.WriteLine("test");
}

Are there any child controls on your form ?

回答2:

This is caused by the interception of events by child controls on form. If this is not desirable, you need set KeyPreview property of parent form to True

回答3:

How about menus, do you have menus with shortcut keys defined? I had an issue where a context menu that was hidden was actually swallowing cetain keys and not passing them on to any of the form key events