How do you prevent a RichTextBox from refreshing its display?

by

Here is complete and working example:

    private const int WM_USER = 0x0400;
    private const int EM_SETEVENTMASK = (WM_USER + 69);
    private const int WM_SETREDRAW = 0x0b;
    private IntPtr OldEventMask;       

    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

    public void BeginUpdate()
    {
        SendMessage(this.Handle, WM_SETREDRAW, IntPtr.Zero, IntPtr.Zero);
        OldEventMask = (IntPtr)SendMessage(this.Handle, EM_SETEVENTMASK, IntPtr.Zero, IntPtr.Zero);
    }       

    public void EndUpdate()
    {
        SendMessage(this.Handle, WM_SETREDRAW, (IntPtr)1, IntPtr.Zero);
        SendMessage(this.Handle, EM_SETEVENTMASK, IntPtr.Zero, OldEventMask);
    }

More Related Contents:

  1. Color different parts of a RichTextBox string
  2. How to compare two rich text box contents and highlight the characters that are changed?
  3. How to color different words with different colors in a RichTextBox while a user is writing and raise an event when that colored text is clicked
  4. A textbox/richtextbox that has syntax highlighting? [C#] [closed]
  5. Change color of text within a WinForms RichTextBox [duplicate]
  6. Detecting if paste event occurred inside a rich text box
  7. Get current scroll position from rich text box control?
  8. Rich Text Box how to highlight text block
  9. Synchronize Scroll Position of two RichTextBoxes?
  10. How can I make a hyperlink work in a RichTextBox?
  11. Displaying tooltip on mouse hover of a text
  12. Reset RTF formatting in a WinForms RichTextBox without discarding its text?
  13. C# RichEditBox has extremely slow performance (4 minutes loading)
  14. RichTextBox Newline Conversion?
  15. Some Alt keys changes my RichTextBox font
  16. Drawing a rectangle with a certain angle of degree
  17. How do I pass a value from a child back to the parent form?
  18. How do I write a backslash (\) in a string?
  19. How to get an HtmlElement value inside Frames/IFrames?
  20. Find a control in Windows Forms by name
  21. How to draw line and select it in Panel
  22. Execute specified function every X seconds
  23. Windows Forms ProgressBar: Easiest way to start/stop marquee?
  24. How do I change the culture of a WinForms application at runtime
  25. Changing font for richtextbox without losing formatting
  26. How to Draw on Zoomable Image in C# windows Forms
  27. Looking for clean WinForms MVC tutorial for C# [closed]
  28. Reading data from DataGridView in C#
  29. Process.Start(url) fails
  30. Winforms : Intercepting Mouse Event on Main Form first, not on Controls

Leave a Comment