用.Compile()方法去将一个表达式树转换为一个委托，然后你可以执行它。

Use the .Compile() method to turn the expression tree into a delegate so that you can execute it.

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联编程序将封装语言的语义，并指定如何使用表达式树在调用站点中执行操作。

Binders encapsulate a language's semantics and specify how to perform operations in a call site by using expression trees.

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联编程序将封装语言的语义，并指定如何使用表达式树在调用站点中执行操作。

Binders encapsulate a language's semantics and specify how to perform operations in a call site by using expression trees.

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