RalativeSource Property理解-WPF

https://*.com/questions/84278/how-do-i-use-wpf-bindings-with-relativesource

If you want to bind to another property on the object(同一个Element):

{Binding Path=PathToProperty, RelativeSource={RelativeSource Self}}

If you want to get a property on an ancestor(Eelement可视化树父级):

{Binding Path=PathToProperty,
    RelativeSource={RelativeSource AncestorType={x:Type typeOfAncestor}}}

If you want to get a property on the templated parent (so you can do 2 way bindings in a ControlTemplate)

{Binding Path=PathToProperty, RelativeSource={RelativeSource TemplatedParent}}

or, shorter (this only works for OneWay bindings):

{TemplateBinding Path=PathToProperty}

corner上的例子：https://www.c-sharpcorner.com/UploadFile/yougerthen/relativesources-in-wpf/