How to check which geometry drawing is clicked by mouse in WPF?

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WPF

in WPF, has anyone ever used the function StrokeContains() function to check whether a Geometry (Circle, Rectangle, line...) has been clicked and selected by the Mouse click in a Canvas? I could not make it work.

or Altenatively, if I can know all the points within each Geometry, then I could also directly check by comparing the mouse position to each point of the Geometry, but how to get all the points of a Geometry then?
thank you!

What I have tried:

I have tried using StrokeContains(), and srangly, the results indicate that all the Geometries have been selected by a single mouse click. It is difficult to debug it.