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Set ApartmentState on a Task

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轮回少年
轮回少年 2020-11-27 03:02

I am trying to set the apartment state on a task but see no option in doing this. Is there a way to do this using a Task?

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6条回答
  • 萌比男神i
    萌比男神i (楼主)
    2020-11-27 03:05

    This is what I'm using with Action since I don't need to return anything:

    public static class TaskUtil
{
    public static Task StartSTATask(Action action)
    {
        var tcs = new TaskCompletionSource();
        var thread = new Thread(() =>
        {
            try
            {
                action();
                tcs.SetResult(new object());
            }
            catch (Exception e)
            {
                tcs.SetException(e);
            }
        });
        thread.SetApartmentState(ApartmentState.STA);
        thread.Start();
        return tcs.Task;
    }
}



    Where I call it like this:
    


    TaskUtil.StartSTATask(async () => await RefreshRecords());

    


    For details, please see https://github.com/xunit/xunit/issues/103 and Func vs. Action vs. Predicate
    


    FYI, this is the exception I was getting where I needed to set the apartment state:
    


    
  
    System.InvalidOperationException occurred   HResult=-2146233079
    
      Message=The calling thread must be STA, because many UI components
      require this.   Source=PresentationCore   StackTrace:
         at System.Windows.Input.InputManager..ctor()
         at System.Windows.Input.InputManager.GetCurrentInputManagerImpl()
         at System.Windows.Input.Keyboard.ClearFocus()
    

    
    
    
             
    
                                                        
    
            
            
    
              
                
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