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Asked: 2026-05-16T15:07:43+00:00

I have a program where I basically need to load Rich Text from a

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I have a program where I basically need to load Rich Text from a StringBuilder.
The problem is, somethimes I get a string that is 100,000 lines long (and this is a possible situation for the program), including Rtf codes and colours.

The problem isn’t building the string, it’s when I asign the Rtf property to the StringBuilder.ToString(), it takes a solid 4 minutes to load.

TextBox.Rtf = Build.ToString();

If I copy this same string from the StringBuilder, and load it in WordPad, it takes about 2 or 3 seconds. I am diabling the RTB’s redrawing by using SendMessage() and WM_SETREDRAW, but that doesn’t change anything.

Any suggestions?

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1 Answer

  1. Editorial Team

    RichTextBox uses riched20.dll which is the v3.0 of the library Rich Edit Control of Microsoft. However, WordPad uses msfedit.dll which is version 4.1.

    Version 4.1 is about 30 times more faster than v3.0

    See this for more information about versions
    MSDN About Rich Edit Controls

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