Hi,
My problem is: When the applications is started, I create a frame (with button and other components) in the principal thread. Later, i create an other Thread and i attempt to modify the frame in the second thread, but it doesn't work. I got this error message:
An unhandled exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll
How can I solve this problem
Thanks
Thread and GUI
Hot Topic
- project cannot be started directly!!
- exception on eventhandler SelectedIndexChanged
- Dynamic Property Value Retrieving
- Installing a System Wide CBT hook
- How to embed DataGridView in dll
- Grammar class for C# 2.0?
- Writing to a file
- Returning Type[] of inherited types
- switch constructs
- Synchronous versus Asynchronous
Visual C#
- Which type in C# is equivalent to C++ HResult?
- VS 2005 IDE Bugs, problems and suggestions
- How to add Intellisense descr
- Conditional References
- What is with all of the files for a simple program?
- windows service running on particular time and debug.write() where it prints ?
- Reading memory address of another process?
- Thread syncronisation is required...?
- Property accessors - overriding one, adding the other
- Windows Unzip and Download
Thread and GUI
jeffmorris
take a look at this also:
http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=564275&SiteID=1
Maximilian Machedon
You should never change controls from a different thread. I think it was finally forbidden in .NET 2.0.
To change controls in a different thread you should use Invoke. There is a bunch of examples out there, one of which is this.
HTH
--mc
Al33327
I don't know what you mean by frame but... I'll try and throw in my two cents.
You need to call the beinginvoke on the form you wish to modify in the second thread. You'll need to create a delegate. Here is an example method that show you how to inline the code, this creates a typing affect which asychronously updates the UI. Anonymous methods make nice code. You can copy and paste this code.
delegate void SomeDelegate(string t); //The delegate definition
public void ShowComplete(string Astring, System.Windows.Forms.Label mylabel){
new Thread((ThreadStart)delegate() //Inline the delegate that is started by the thead.{
SomeDelegate del = delegate(string t) //Inline a delegate that will be called to update the label{
mylabel.Text += t;
mylabel.Update();
};
foreach ( System.Char temp in Astring){
IAsyncResult res = this.BeginInvoke( del, temp.ToString()); //Call del ( the delegate we created above )res.AsyncWaitHandle.WaitOne();
// Wait till its done. Thread.Sleep(100); //Wait a tick and do the next char}
Thread.Sleep(1000); this.BeginInvoke( (ThreadStart)delegate(){ mylabel.Text = ""; }); //Set the lable to "" after typing it out}).Start();
}