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PORestoring WinForm with textbox containing large amount of data
 

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  1. PORestoring WinForm with textbox containing large amount of data
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    <p>I have created a form in C# (VS2010) which contain (among other) a textbox control. The textbox may contain large amount of data at some point (~3 million chars).</p> <p>When scrolling or moving the form around no problems are encountered, but when the form is minimized and restored back again, a repaint sequence (I believe) is triggered which causes a big lag of around 5-10 seconds for the form to be repainted.</p> <p>I've already tried several solutions:</p> <ol> <li><p>Using double buffer – according to what I've read, double buffering applies only to the form itself and not to its controls</p> <p><code>this.SetStyle(ControlStyles.DoubleBuffer, true);</code> <code>this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);</code> <code>this.SetStyle(ControlStyles.UserPaint, true);</code></p></li> <li><p>Disabling the textbox redrew once minimized using: <code>SendMessage(this.my_textBox.Handle, WM_SETREDRAW, false, 0);</code> and enabling back after form is restored. I've noticed that the form repaint lag exist also if I <strong>don't re-enable the textbox repaint</strong>.</p></li> <li><p>Manual double buffer using a bitmap – similar results as #1.</p></li> </ol> <p>I read somewhere that this issue might be related to the textbox control trying to shrink or adjust to the amount of data, but couldn't override it.</p> <p>I previously had the same project in MFC, but didn't encounter any repaint or lagging issues there.</p> <p>Please advise me how to solve this issue.</p>
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    1. COSet the WordWrap property to False. It is expensive.
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    2. COWordWrap is essential for my purposes. Besides, i don't encounter any repaint issue while the textbox is being updated, or form moved around - only when window is restored from minimize state.
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    3. COWell, you asked for advice. Not taking it was the expected outcome.
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      1. USHans Passant
 

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