() => 的含义C# 中的运算符(如果存在) [英] Meaning of () => Operator in C#, if it exists

问题描述

在 Jon Skeet 的回答中，我在这里读到了这条有趣的线路.

I read this interesting line here, in an answer by Jon Skeet.

有趣的是，他主张使用委托:

The interesting line is this, where he advocated using a delegate:

Log.Info("I did something: {0}", () => action.GenerateDescription());

问题是，我想知道这个 ()=> 运算符是什么?我试过用谷歌搜索它，但因为它是由符号组成的，所以谷歌真的帮不上什么忙.我是不是很尴尬地错过了什么?

Question is, what is this ()=> operator, I wonder? I tried Googling it but since it's made of symbols Google couldn't be of much help, really. Did I embarrassingly miss something here?

推荐答案

这引入了一个不带参数的 lambda 函数(匿名委托)，它相当于并且基本上是以下的简写:

This introduces a lambda function (anonymous delegate) with no parameters, it's equivalent to and basically short-hand for:

delegate void () { return action.GenerateDescription(); }

你也可以添加参数，所以:

You can also add parameters, so:

(a, b) => a + b

这大致相当于:

delegate int (int a, int b) { return a + b; }

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