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Xamarin.Forms - BeginInvokeOnMainThread for an async Action

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我寻月下人不归
我寻月下人不归 2021-01-19 01:02

I am familiar with the rules about updating UI elements on the UI thread using the Device.BeginInvokeOnMainThread, however I have an operation that needs to be run on the UI

3条回答
  • 感情败类
    感情败类 (楼主)
    2021-01-19 01:27

    Dropping this here in case someone wants to await the end of an action which has to be executed on the main thread

    public static class DeviceHelper
{
    public static Task RunOnMainThreadAsync(Action action)
    {
        var tcs = new TaskCompletionSource();
        Device.BeginInvokeOnMainThread(
            () =>
            {
                try
                {
                    action();
                    tcs.SetResult(null);
                }
                catch (Exception e)
                {
                    tcs.SetException(e);
                }
            });

        return tcs.Task;
    }

    public static Task RunOnMainThreadAsync(Task action)
    {
        var tcs = new TaskCompletionSource();
        Device.BeginInvokeOnMainThread(
            async () =>
            {
                try
                {
                    await action;
                    tcs.SetResult(null);
                }
                catch (Exception e)
                {
                    tcs.SetException(e);
                }
            });

        return tcs.Task;
    }
}

    
    
             
    
                                                        
    
            
            
    
              
                
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