In WPF, under what circumstances does Visual.PointFromScreen throw InvalidOperationException?

Question

Suppose I wanted to do this, so I can find the current position of the mouse relative to a Visual, without needing access to a specific mouse event:

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Answer 1

The exception may occur because a visual is discarded but still in memory due to a memory leak.

I was having a similar problem. I found the exception occurring in a visual which was supposed to be garbage collected. Fixing the memory leaks in the visual solved the problem.