.net - How do I determine if a WPF window is modal?

Question

What's the easiest way to figure out if a window is opened modally or not?

CLARIFICATION:

I open a window calling

myWindow.ShowDialog();

I have a footer with an "OK" & "Cancel" button that I only want to show if the window is opened modally. Now I realize I can set a property by doing this:

myWindow.IsModal = true;
myWindow.ShowDialog();

But I want the window itself to make that determination. I want to check in the Loaded event of the window whether or not it is modal.

UPDATE

The IsModal property doesn't actually exist in a WPF window. It's a property that I have created. ShowDialog() blocks the current thread.

I'm guessing I can determine if the Window is opened via ShowDialog() by checking if the current thread is blocked. How would I go about doing that?

Answer 1

There's a private field _showingAsDialog whenever a WPF Window is a modal dialog. You could get that value via reflection and incorporate it in an extension method:

public static bool IsModal(this Window window)
{
    return (bool)typeof(Window).GetField("_showingAsDialog", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(window);
}

The value is set to true when the window is shown as modal (ShowDialog) and set to false once the window closes.