C＃=＆GT;运营商？ [英] C# => operator?

问题描述

我有一个问题 =方式＆gt; 运算符在C＃

I have a question about the => operator in C#.

我在看防爆pression混合4个样本。有接触样品，它包括在一个行：

I am looking at the Expression Blend 4 samples. There is one line in the Contact sample which includes:

//In C:\Program Files (x86)\Microsoft Expression\Blend 4\Samples\en\Contacts\
//Contacts\ViewModels\ContactsViewModel.cs: 

contactDetailWindow.Closed += (o, e) =>
{                              
   finishedCallback(contactDetailWindow.DialogResult);

   // Or, C:\Program Files (x86)\Microsoft Expression\Blend 4\Samples\en\
   // Contacts\Contacts\ViewModels\ContactsViewModel.cs
   this.EditContact(newContact, dialogResult =>
   {
        if (dialogResult.HasValue && dialogResult.Value)
        {
        this.Contacts.Add(newContact);
        }
   });
};

什么是 =＆GT; 运营商实际上是在做什么？难道是压倒一切的东西吗？

What is the => operator actually doing? Is it overriding something?

推荐答案

=>是一个lambda前pression运营商可以把它看成在JavaScript中的匿名函数

=> is a lambda expression operator you can think of it as an anonymous function in javascript

在这种情况下

ContactDetailWindow.Closed += (o, e) => { finishedCallback(contactDetailWindow.DialogResult);

它正在创建正被用作处理程序闭合事件的功能。该编译器可以推断类型O和电子商务，因为它知道的封闭delelegate的确定指标。

it is creating a function that is being used as the handler for the closed event. The complier can infer the types of o and E since it knows the defintion of of the closed delelegate.

这篇关于C＃=＆GT;运营商？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！