Invalid Winforms UI Request

Question

I have a user interface and inside it.

While executed BackgroundWorker, it updates the user interface through Marshalling. The user interface did not respond during one of the runs. I pressed the pause button in Visual Studio to find out what was going on.

The following lines were shown in the Threads window:

• Application.Run(new uxRunSetup());

• private delegate void DisplayCounterHandler(int[] counts, int total);

  private void DisplayCounter(int[] counts, int total)    
   {  
      if (InvokeRequired)      
     {    
        //stuck on Invoke below.     
        Invoke(new DisplayCounterHandler(DisplayCounter), counts, total);     
                      return;  
     }  
     //some UI updates here.  
  }  
  

I read through this thread. My question is: let's say a call was called DisplayCounterHandler. However, BackgroundWorker is already complete. Could this lead to the user interface not responding and crashing?

Thank.

Answer 1

You should switch your Invoke to BeginInvoke, i.e.

if(this.InvokeRequired)
{
  this.BeginInvoke(...);
  return;
}

// UI updates here

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