DependencyObject.InvalidateProperty not working

Question

Based on the documentation via MSDN...

You can also use InvalidateProperty to force re-evaluation of a binding against a data source that is not a

Answer 1

As you mentioned, it ought to work but doesn't. But there is a simple workaround:

// Doesn't work:
//b.InvalidateProperty(Button.ContentProperty);

// Works:
BindingOperations.GetBindingExpression(b, Button.ContentProperty).UpdateTarget();

I debugged into the reference source and all InvalidateProperty does in your situation is cause a cached value to be re-read from the BindingExpression into the Button Content property. Offhand, I don't know when this would even be necessary but it's not useful to get the BindingExpression to re-read the raw property.

Since the workaround is convenient and general, the only further effort warranted is filing a bug report with Microsoft.