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POPartial transparency with C# .NET 3.5 WinForms?
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  1. POPartial transparency with C# .NET 3.5 WinForms?
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    copied!<p>I'm making a .NET 3.5 app with a form that draws a partially transparent black background. I'm overriding OnPaintBackground to accomplish this:</p> <pre><code>protected override void OnPaintBackground( PaintEventArgs e ) { using ( Brush brush = new SolidBrush( Color.FromArgb( 155, Color.Black ) ) ) { e.Graphics.FillRectangle( brush, e.ClipRectangle ); } } </code></pre> <p>It works, but occasionally the form draws over itself without clearing the screen, making the transparency darker than it should be. I've tried playing with <code>Graphics.Flush()</code> and <code>Graphics.Clear()</code>, but it either doesn't help or completely removes transparency. Any suggestions?</p> <p><strong>Edit:</strong> Here's what it looks like, after starting the app on the left, and after the form redraws itself a few times (in response to tabbing from one control to another) on the right:</p> <p><a href="http://www.quicksnapper.com/files/5085/17725729384A10347269148_m.png" rel="nofollow noreferrer">Transparency Issue http://www.quicksnapper.com/files/5085/17725729384A10347269148_m.png</a></p> <p><strong>Edit 2:</strong> I was trying a few things out this morning and noticed that when the desktop behind the transparent portions change, it's not actually being redrawn. For example, if I open Task Manager and put it behind the window, you don't see it refreshing itself. This makes sense with what I've been seeing with the transparency levels. Is there a function to make Windows redraw the area behind your window?</p> <p><strong>Edit 3:</strong> I've tried changing a few properties on the form, but they all result in the form drawing non-transparent black:</p> <pre><code>this.AllowTransparency = true; this.DoubleBuffered = true; this.Opacity = .99; </code></pre> <p>I'm going to try creating a separate window for the transparent portion as overslacked mentioned, but any other ideas are still welcome.</p>
 

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