Identify that a Window is completely hidden

In order to create a screen shot, I am hiding a wpf window. The code looks like that.

      Hide开发者_开发问答();
      var fullScreenshot = _cropper.TakeFullScreenshot();
      Show();

Sometimes the Application is not hidden when the screen shot is taken. How can I can I identify, that the window is completely hidden?

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I don't know how the screenshot is taken but I suspect that the UI-Thread has not removed all the content and therefore the TakeFullScreenshot sees rests of your app.

I would try to wait until your app has done all necessary ui-work and then trigger the TakeFullScreenshot-operation.

Trigger the ScreenShot-Operation with the Dispatcher:

Hide();
Dispatcher.BeginInvoke(new Action(delegate { 
    fullScreenshot = _cropper.TakeFullScreenshot(); 
    Show();
    }), System.Windows.Threading.DispatcherPriority.ContextIdle, null);

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Currently I am trying out this solution:

public void Foo()
{
    IsVisibleChanged += WhenVisibiltyChangend_TakeScreenshot_and_OpenCreateTicketDialog;
    Hide();
}}

void WhenVisibiltyChangend(object sender, DependencyPropertyChangedEventArgs e)
{
    if ((bool)e.NewValue == false) { 
        var fullScreenshot = _cropper.TakeFullScreenshot();
        Show();
    }
}

I hope this is the correct answer, but I have to do some additional tests.