[Gtk-sharp-list] How to use System.Drawing.Graphics in Mono ?

Stifu stifu at free.fr
Tue Nov 16 10:38:56 EST 2010

Drawing in the Click event sounds wrong.
You should probably do something like: flip a flag on Click, and invalidate
the control. Then in the Draw event handler method (whatever it's called in
GTK#), check the flag and draw appropriately (using the Graphics object
passed as parameter).

yu.wenpeng wrote:
> hello,
>   I want to draw some lines in the Gtk.window. So,I put a DrawingArea and
> a button in the window. In the Click event of the button:
> try
> {
>     System.Drawing.Graphics g =
> Gtk.DotNet.Graphics.FromDrawable(DA.GdkWindow, true));
>     //DA is the DrawingArea in the window.
>     g.DrawLine(new Pen(System.Drawing.Color.Red,1),5,5,100,5);
> }
> catch(Exception ex)
> {
>     string str=ex.Message;
> }
> when it runs at : g.DrawLine(...), an exception is raised
> the excetpion message is  General Error in GDI+.
> I don't know how to fix this problem..
> Windows 7 + MonoDevelop + C#

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