“ =”是什么意思？意思？ [英] What does "=>" mean?

问题描述

请原谅我，如果这叫新手，但是 => 在C＃中是什么意思？上周我在一次演讲中，这个运算符（我认为）是在ORM中使用的。在回到笔记之前，我并没有真正关注语法的具体细节。

Forgive me if this screams newbie but what does => mean in C#? I was at a presentation last week and this operator (I think) was used in the context of ORM. I wasn't really paying attention to the specifics of syntax until I went back to my notes.

推荐答案

在C＃中， lambda运算符写为 =>（通常发音为<<> ）。这意味着左侧的参数将传递到右侧的代码块（lambda函数/匿名委托）中。

In C# the lambda operator is written "=>" (usually pronounced "goes to" when read aloud). It means that the arguments on the left are passed into the code block (lambda function / anonymous delegate) on the right.

因此，如果您具有Func或Action（或它们的堂兄弟中有更多类型参数），则可以为其分配lambda表达式，而无需实例化委托或采用另一种方法进行延迟处理：

So if you have a Func or Action (or any of their cousins with more type parameters) then you can assign a lambda expression to them rather than needing to instantiate a delegate or have a separate method for the deferred processing:

//creates a Func that can be called later
Func<int,bool> f = i => i <= 10;
//calls the function with 12 substituted as the parameter
bool ret = f(12);

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