'=>'是什么意思？

Question

What does => means? Here's a code snap:

Dispatcher.BeginInvoke((Action)(() => { trace.Add(response); }));

Answer 1

it's lambda expression which is the simplified syntax of anonymous delegate. it reads 'goes to'. equivalent to Dispatcher.BeginInvoke((Action)delegate() { trace.Add(response); });

Answer 2

=> is lambda expression operator which indicate that the code is lambda expression.

( param ) => expr(int x) = > { return x + 1 };

or

param => exprx=> x + 1;>

What is Lambda expression ?

* Lambda expression is replacement of the anonymous method avilable in C#2.0 Lambda 
  expression can do all thing which can be done by anonymous method.
* Lambda expression are sort and function consist of single line or block of statement.

Read more : Lambda Expressions

Answer 3

=> is an operator called Lambda Operator

It is used for creating a lambda expression

Answer 4

这是lambda运算符=>

Answer 5

它是一个lambda运算符，读起来像“去”

Answer 6

This "=>" means the use of lambda expression syntax in C#.

This syntax is available since Visual Studio 2008 in .NET 3.5 (C# 3.0). This is the MSDN official documentation of lambda expression in C# .

The code above is the same as anonymous delegate in already available since C# 2.0

Your code:

Dispatcher.BeginInvoke((Action)(() => { trace.Add(response); })); 

is translated into:

Dispatcher.BeginInvoke(new delegate () { trace.Add(response); });

Those two codes essentially have the same semantics.

Answer 7

值得注意的是，单个表达式lambda不需要身体周围的{}，也不需要分号，所以你可以简化你的代码（略）。

Dispatcher.BeginInvoke((Action)(() => trace.Add(response) ));