WinRT - MessageDialog.ShowAsync will throw UnauthorizedAccessException in my custom class

Question

I Want to write my own control, when the ctor is invoked, a MessageBox is shown.

public class Class1
{
    public Class1()
    {
        ShowDialog();
    }
         


        

Answer 1

I think I've found it. I had the same problem when creating messageboxes in any other threads besides the main thread. This is the C++ solution but I think you can convert it easily ;)

    IAsyncOperation ^Op = msgbox->ShowAsync();
    task( Op ).then([=](IUICommand^ C)
    {

    }).then([](task t) 
        {
            try 
            {
                t.get();
            }
            catch (Platform::Exception ^e)
            {   
                //ERROR!                            
            }           
        });

On a side note this is the correct way to handle ANY WinRT/Windows 8 Store C++ exception.