()=> 有什么用?银光闪闪 [英] what is the use of ()=> in silverllight

问题描述

你能说说()=>和=>的作用是什么?我在代码中看到了这一点.我没有得到任何参考.

Can you say what is the use of the ()=> and =>? I saw this in a code. I did not get any reference for this.

this.Dispatcher.BeginInvoke(()=>
{
    //some thing..
};

推荐答案

此表示法是 lambda 表达式 不带参数.如果 lambda 表达式使用参数，它们将在括号的空集中声明，如 say...

This notation is that of a lambda expression which takes no argument. If the lambda expression made use of arguments they would be declared in the empty set of parenthesis as in say...

this.Dispatcher.BeginInvoke((x, y) => { do some' with x and/or y }, 12, somevar);

简而言之，lambda 表达式允许在需要的地方创建无名"函数.
在问题的示例中，BeginInvoke() 方法要求它的第一个参数是一个委托(指向方法的指针")，这正是这个 lambda 表达式所提供的.

In a nutshell, lambda expressions allows creating "nameless" functions, right where they are needed.
In the example of the question, the BeginInvoke() method requires its first parameter to be a delegate (a "pointer to a method"), which is exactly what this lambda expression provides.

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