Turn off screen updating while I fill a RichTextBox

[Guest]

I am filling a richtextbox via the AppendText method and it works great.
However, I would like to to off screen updating, add my 50 or so lines to the
richtextbox, and then turn screen updating back on.

How do I do this? SuspendLayout does not do this.

Thanks.

 

[Walter Wang [MSFT]]

Hi Dave,

You can use WM_SETREDRAW message to do this. Refer to following FAQ entry:

#Windows Forms FAQ - Windows Forms
http://msdn2.microsoft.com/en-us/netframework/aa497373.aspx
How do I suspend painting a form until all its controls are initialized?

There is not currently a way to do this built into the framework, but
WM_SETREDRAW will do what you're looking for:

[ DllImport( "user32" ) ]
private static extern bool SendMessage( IntPtr hWnd, int msg,
int wParam, int lParam );
private const int WM_SETREDRAW = 0xB;

int paintFrozen;

private bool FreezePainting
{
get { return paintFrozen > 0; }
set
{
if ( value && IsHandleCreated && Visible )
if ( 0 == paintFrozen++ )
SendMessage( Handle, WM_SETREDRAW, 0, 0 );

if ( !value )
{
if ( paintFrozen == 0 ) return;
if ( 0 == --paintFrozen )
{
SendMessage( Handle, WM_SETREDRAW, 1, 0 );
Invalidate( true );
}
}
}
}


Hope this helps.


Sincerely,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

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[Walter Wang [MSFT]]

Hi Dave,

Does the above suggestion work for you? Please feel free to let me know if
there's anything unclear. Thanks.


Regards,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

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