change gui controls from another thread in c#

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I am using a user control in windows application this project is build as class library
then i use another class library to access the windows form then changes the user controls shown in the main form, this library has another thread that waits user actions on the gui to do some work
another console application runs the second class library first thread to run windows application and the second to wait user actions and change the user controls according to user input
I faced the problem that i cannot change UI owned by another thread i passed this by using

C#

if(InvokeRequired) Invoke(new Action<object, EventArgs>(button_Click),sender,e) ;

In test it looks it is working but actually each time i invoke an event or invoke any method using this syntax i found that it is executed more than once and each time it is doubled

thank you for any help

Posted 13-Jul-12 21:23pm

Waleedkassem

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Trak4Net · Answer 1 · 2012-07-13T22:19:00

This is typically how I ensure the method is executed back on UI thread. Typically it would not be a button click but an event handler...

You might want to look into Synchronizing context for your library classes that run on seperate thread. You can assign the UI thread as the synchronizing context and inside your non-ui thread you can post back to the UI thread so any events raised or methods executed can be executed back to the UI thread if you are required to update UI controls.

Understanding SynchronizationContext (Part I)[^]

http://www.codeproject.com/search.aspx?q=Synchronizing+context&sbo=kw&x=0&y=0[^]

C#

private void button1_Click(object sender, EventArgs e)
       {

           if (this.InvokeRequired)
           {
               this.Invoke(new EventHandler(button1_Click), new[] { sender, e });
           }
           else
           {
               //perform UI update
           }
       }