即使在C＃中单击用户控件，如何触发表单单击事件

Question

I need to detect all mouse click from a Windows forms application which has many user controls in it. I can capture every controls click event and pass it to main form but this would not be practicle because form has many custom user controls (over a hundred) and some of the are already using this event. I tried to add click, mouseclick, mouse up and down events but I couldn't make them fire if you click on the user controls instead of an empty part of the form. I searched the net for possible solutions but nothing was satisifactory.

Is there a practicle way to make the form click event fire even clicking on the user controls? I also wellcome any suggestions to record user mouse clicks without using form click event.

Answer 1

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    protected override void WndProc(ref Message m)
    {
        // 0x210 is WM_PARENTNOTIFY
        // 513 is WM_LBUTTONCLICK
        if (m.Msg == 0x210 && m.WParam.ToInt32() == 513)
        {
            // get the clicked position
            var x = (int)(m.LParam.ToInt32() & 0xFFFF);
            var y = (int)(m.LParam.ToInt32() >> 16);

            // get the clicked control
            var childControl = this.GetChildAtPoint(new Point(x, y));

            // call onClick (which fires Click event)
            OnClick(EventArgs.Empty)

            // do something else...
        }
        base.WndProc(ref m);
    }

Answer 2

This question is quite old now, but there are solutions that don't involve overriding the WndProc of the form.

For example, you can recursively add a click event to all controls in the control hierarchy using something like this:

private void SetupNestedClickEvents(Control control, EventHandler handler)
{
    control.Click += handler;
    foreach (Control ctl in control.Controls)
        SetupNestedClickEvents(ctl, handler);
}

You simply call it like this (with ctl being the Form , UserControl , or Control you want to apply this to):

SetupNestedClickEvents(ctl, (sender, e) => { // Your code here });

For example:

SetupNestedClickEvents(this, (sender, e) => { Close(); });

Run on the current Form , will set any control in the hierarchy anywhere under the form to close the form when clicked.