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MaxHeight="{Binding Path=ActualHeight, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"参考文献
https://www.cnblogs.com/-Timosthetic/p/16021865.html
MaxHeight="{Binding Path=ActualHeight, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"https://www.cnblogs.com/-Timosthetic/p/16021865.html