c# - Disable image paste in RichTextBox in Winforms -

we have usercontrols herits richtextbox. forbid user enter image(with copy paste) in user control.

i found several places speaking of this:

• this doesn't work winforms
• this not work when doing right-click -> paste

currently i've solution:

protected override bool processcmdkey(ref message msg, keys keydata) {     if (keydata == (keys)shortcut.ctrlv || keydata == (keys)shortcut.shiftins)     {         if (clipboard.containsimage())         {             return false;         }     }     return base.processcmdkey(ref msg, keydata); } 

which works copy paste ctrl+c-ctrl+v, not contextual menu.

edit

i tried given proposition:

public class customrichbox : richtextbox {     private const int wm_paste = 0x0302;     protected override void wndproc(ref message m)     {         if (m.msg == wm_paste )         {             if (clipboard.containsimage())             {                 return;             }         }         base.wndproc(ref m);     } } 

but when ctrl+v, don't receive message

sadly there no global paste-event, on can subscribe in wpf. maybe solution you:

hook on default "paste" event of winforms textbox control

this worked me.