使用Lambda表达式作为参数？ [英] Use Lambda expressions as a parameter?

问题描述

我想用lambda表达式在我的仓库
作为一种通用的参数。如果我使用一个公司像这样的：

I would like to use the lambda expression in my Repository as a generic parameter. If I use a firm like this one:

MyEntity entity:null

void Run(Expression<Func<MyEntity ,bool>> expression)

我可以调用它是这样的：

I can call it in this way:

Run(x => x.FirstName = "Whatever")

我想是这样做的能力：

Run(x => x.FirstName = "Whatever" and x.LastName = "whatelse")

或

Run(x => x.FirstName = "Whatever" && x.LastName = "whatelse")

和阅读x.FirstName和x.LastName的$ b $里面的内容b中的程序跑。 ？有没有办法来实现这一目标。

And read the content of x.FirstName and x.LastName inside the procedure Run. Is there a way to accomplish that?

推荐答案

您已经声明为运行方式：

You have your Run method declared as:

void Run(Expression<Func<MyEntity ,bool>> expression)

这只会工作，如果你只是它声明为：

This would just work if you just declared it as:

void Run(Func<MyEntity ,bool> expression)

有没有你正在做一个表达的一个原因，而不仅仅是一个委托（ Func键< myEntity所，布尔> ）直接

Is there a reason you're taking an expression, and not just a delegate (Func<MyEntity,bool>) directly?

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