Updating UI from events using asyc await

Question

I am trying to understand how to update a UI from an event while using async/await pattern. Below is the test code I am using on a WinForm app. I am not even sure this is th

Answer 1

You should use Invoke method of Control. It executes some code in Control's thread. Also you can check InvokeRequired property to check if you need to call Invoke method (it checks if the caller is on a different thread than the one the control was created on).

Simple example:

void SomeAsyncMethod()
{
    // Do some work             

    if (this.InvokeRequired)
    {
        this.Invoke((MethodInvoker)(() =>
            {
                DoUpdateUI();

            }
        ));
    }
    else
    {
        DoUpdateUI();
    }
}

void DoUpdateUI()
{
    // Your UI update code here
}

In some cases you should check the IsHandleCreated property of Control before calling Invoke method. If IsHandleCreated returns false then you need wait while Control's handle will be created