MessageDialog.ShowAsync and System.UnauthorizedAccessException

Question

I use this message when my device connected successfully. When i connected first time there is no exception but when i do reconnect i have UnauthorizedAccessException on md.ShowAsync(). The problem is that MessageDialog.ShowAsync() function throws an error System.UnauthorizedAccessException.

I saw the solution for similar problem but it does not work for me.

async void ShowMessageBox(string msgstr, string msgtitle, Boolean bConnectiomStatus)
        {
            if (msgstr == null)
                msgstr = "";
            if (msgtitle == null)
                msgtitle = "";

            MessageDialog md = new MessageDialog(msgstr, msgtitle);
            bool? result = null;
            md.Commands.Add(new UICommand("OK", new UICommandInvokedHandler((cmd) => result = true)));

            await md.ShowAsync();

            if (result == true)
            {
                md.ShowAsync().Cancel();
                if (bConnectiomStatus)
                {
                    UpdateConnectionStatus(_session.User.Name, "Connected");
                }
                else
                    UpdateConnectionStatus(_session.User.Name, "Not Connected");
            }
        }

            

Answer 1

it happens if ShowAsync() is called when a MessageDialog is already open. Probally your method ShowMessageBox is called twice.

what you can do to delay the second:

private SemaphoreSlim _semaphore = new SemaphoreSlim(1);
        async void ShowMessageBox(string msgstr, string msgtitle, Boolean bConnectiomStatus)
        {
            if (msgstr == null)
                msgstr = "";
            if (msgtitle == null)
                msgtitle = "";

            await _semaphore.WaitAsync();

            MessageDialog md = new MessageDialog(msgstr, msgtitle);
            bool? result = null;
            md.Commands.Add(new UICommand("OK", new UICommandInvokedHandler((cmd) => result = true)));

            await md.ShowAsync();

            if (result == true)
            {
                md.ShowAsync().Cancel();
                if (bConnectiomStatus)
                {
                    UpdateConnectionStatus(_session.User.Name, "Connected");
                }
                else
                    UpdateConnectionStatus(_session.User.Name, "Not Connected");
            }
            _semaphore.Release();
        }

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Microsoft Certified Solutions Developer - Windows Store Apps Using C#

Answer 2

Unfortunately, it did not work. Is there opportunity to close md.ShowAsync if it is open?