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Is Forms.Timer multithreaded or...?

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Bryan Cool via .Net Guru (VIP)

I have a C# app with a child window (let's call it WindowY) and a PropertyGrid (the PropertyGrid is also a child of the app, not a child of WindowY). I used to have a System.Windows.Forms.Timer that would trigger a call into a C++ DLL (in the DLL is some code to paint WindowY). I also implemented some custom UITypeEditors for the PropertyGrid, which would pop up as modal dialogs and you could edit some properties; all the while, the timers would keep triggering the repaint on WindowY so you could see your changes in real-time.

Recently, the timers were removed and instead of Application.Run(), a standard message loop was directly written (using NativeMethods code). Now, when I go to edit something with one of the UITypeEditors in the PropertyGrid, the message loop of the main window appears to be inactivated, and WindowY is not refreshed. I expect this lack of refresh, since the editor is a modal dialog (though the same thing happens if I make the editor a drop-down); however, it's not something that I want: I need to have WindowY continue to be refreshed. Is there a way to make this happen? I don't really want to go back to using the timers, since there are some key benefits to rolling my own message loop. Does System.Windows.Forms.Timer bypass message loops? Is there a way to emulate that behavior?

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From: Bryan Cool

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Posted by a user from .Net Guru (http://www.dot-net-guru.com/)

<Id>x2SUmthr9E69+V2yaq+D7Q==</Id>

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Sijin Joseph

Windows is built fundamentally on message passing, i don't think there
is any way for an application to recv a timer message without a message
loop.

Sijin Joseph
http://www.indiangeek.net
http://weblogs.asp.net/sjoseph

Bryan Cool via .Net Guru wrote:
[Original message clipped]

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	System.Windows.Forms.Application
	System.Windows.Forms.PropertyGrid
	System.Windows.Forms.Timer

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