Question

So I have a control which, in response to its items being changed, calls UpdateLayout(). This results in a stack trace that looks like the following:

Description: The application requested process termination through
System.Environment.FailFast(string message). Message: Unrecoverable
system error. Stack: at System.Environment.FailFast(System.String)
at MS.Internal.Invariant.FailFast(System.String, System.String) at
MS.Internal.Invariant.Assert(Boolean, System.String) at
System.Windows.Window.GetWindowMinMax() at
System.Windows.Window.MeasureOverride(System.Windows.Size) at
System.Windows.FrameworkElement.MeasureCore(System.Windows.Size) at
System.Windows.UIElement.Measure(System.Windows.Size) at
System.Windows.ContextLayoutManager.UpdateLayout() at
System.Windows.UIElement.UpdateLayout() at

Clearly, under some circumstances, GetWindowMinMax() is failing an Assert() of some sort, which is causing an call to Environment.FailFast. What conditions can I check before calling UpdateLayout to ensure that these circumstances do not occur in order to avoid encountering this error?

Answer 1

Take Reflector and peek at the code for GetWindowMinMax. This is the assert:

Invariant.Assert (!this.IsCompositionTargetInvalid, 
    "IsCompositionTargetInvalid is supposed to be false here") ;

So it would appear that your window is not really created as a Win32 window yet or its Win32 window is already destroyed.