Delegates and STA problem

[sebouh181]

Hi,

I Have a for each loop that calls a method in a class that will generate the UI.

I want to call this method asynchronously. I used a delegate, but every time I do deleagte.beginInvoke() this error appears:

The calling thread must be STA, because many UI components require this.


Any ideas?

[PRR]

Look at this thread.
Look into
Control.BeginInvoke Method

[sebouh181]

Let me explain more about the scenario;

I am using WPF.

This is in onload of the page

delegate string AsyncMethodHandler(cls_PAGESTRUCTURE.NumBtnItem obj_numBtn);

foreach (NumBtnItem obj_numBtn in obj_page.NumBtns)
{
AsyncMethodHandler caller = default(AsyncMethodHandler);
caller = new AsyncMethodHandler(CreateBtns);
caller.BeginInvoke(obj_numBtn, CallBack, null);
}

CreateBtns function will create WPF objects on the page

This is the scenario as a summary

[PRR]

I have not worked on WPF as yet. To update a windows form from another thread (non UI) you need to use delegate which will call a function, which in turn uses a control.invoke to update the UI.
Article by:Nicholas Paldino.

[tlhintoq]

Or you could add the STAThreadattribute to your Program.CS file.

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThreadAttribute]
        static void Main(string[] commandLine)
        {
            // Your program setup stuff here
            Application.EnableVisualStyles();
            //Application.SetCompatibleTextRenderingDefault(true);
            App myApp = new App();
            myApp.Run(commandLine);
        }