The escape sequence is not a markup extension and is not backed by a class.

转义序列不是标记扩展，不受类的支持。

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When implemented in a derived class, returns an object that is provided as the value of the target property for this markup extension.

在派生类中实现时，返回一个对象，此对象是作为此标记扩展的目标属性的值提供的。

youdao

Indicates that a class can use a markup extension to provide a value, and references a handler to use for markup extension set operations.

指示类可以使用标记扩展提供值，并引用要用于标记扩展设置操作的处理程序。

youdao

Indicates that a class can use a markup extension to provide a value, and references a handler to use for markup extension set operations.

指示类可以使用标记扩展提供值，并引用要用于标记扩展设置操作的处理程序。

youdao