> Func键℃之间的差异;与委托和lambda表达式 [英] Difference between Func<> with delegate and lambda expression

问题描述

同时加深自己的C＃更先进的功能，我遇到了一些代码，但我并不确切知道的差异。这是关于两行：

while deepening myself to more advanced features of C#, I came across some code, which I didn't exactly know the difference of. It's about these two lines:

Func<string, int> giveLength = (text => text.Length);

和

Func<string, int> giveLength = delegate(string text) { return text.Length; };

这可以用同样的方式使用：

This can be used in the same way:

Console.WriteLine(giveLength("A random string."));

所以基本上..什么是这两条线的区别？而且这些线路编译到同一CIL？

So basically.. What is the difference of these two lines? And are these lines compiling to the same CIL?

推荐答案

他们是一样的，基本上是这样。他们两个的匿名函数的在C＃中规范的术语。

They're the same, basically. They're both anonymous functions in C# specification terminology.

Lambda表达式一般都比较简洁，也可以转换成的expression树的，这些都是进程外，LINQ是至关重要的。

Lambda expressions are generally more concise, and can also be converted to expression trees, which are crucial for out-of-process LINQ.

匿名方法让你放弃参数列表，如果你不在乎。例如：

Anonymous methods allow you to drop the parameter list if you don't care. For example:

EventHandler handler = delegate { 
    Console.WriteLine("Sender and args don't matter");
};

考虑如何很少需要对后一点，匿名方法正在成为现代的C＃濒危物种。 Lambda表达式更为常见。

Given how rarely the latter point is required, anonymous methods are becoming an endangered species in modern C#. Lambda expressions are much more common.

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