CODEWITHSUNDEEP
c#wpfwindowmessagebox
IneedHelp
IneedHelp

Reputation: 1758

Why does System.Windows.MessageBox lag a WPF window?

Consider the following code:

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    MessageBox.Show("MyMessage");
}

If I am trying to display a message box after a WPF window has been loaded, when I run the application, the WPF window is displayed with a transparent background (only the non-client area is visible) and it takes 3-5 seconds until the message box appears. The WPF window returns to normal only after the message box has been closed.

Is this normal? Does anyone else experience this?

EDIT: I have added a screenshot of how the window looks like:

enter image description here

Upvotes: 3

Views: 2277

Answers (2)

Rachel
Rachel

Reputation: 132628

The MessageBox is getting shown at the Normal DispatcherPriority, which occurs before things like DataBind, Render, and Loaded, so the code that initializes your Window's objects is not getting run until after you dismiss the MessageBox

You can fix this by simply showing the MessageBox at a later DispatcherPriority, such as Background

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    InitializeComponent();

    this.Dispatcher.BeginInvoke(DispatcherPriority.Background, 
        new Action(delegate() { MessageBox.Show("MyMessage"); }));
}

Upvotes: 7

Dennis
Dennis

Reputation: 37790

Try this overload of Show method, or any other overload, accepting Window instance as parameter.

Upvotes: 0

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