委托、Lambda、Action、Func、匿名函数 [英] Delegates, Lambdas, Action, Func, Anonymous Functions

问题描述

我只是想验证我对以下内容的理解

I just want to verify my understanding about the following

• 委托 - 方法签名
• Lambdas - 匿名函数
• 匿名函数 - 仅此而已
• Action - 一个不返回任何内容的匿名函数
• Func - 一个返回某些东西的匿名函数

• Delegate - a method signature
• Lambdas - anonymous function
• Anonymous Function - just that
• Action - An anonymous function that returns nothing
• Func - An anonymous function that returns something

嗯...他们都做类似的事情，你如何定义&知道什么时候使用每个?

hmm... they all do similar things, how do you define & know when to use each?

对不起，我解释得不好

推荐答案

• 委托 - 它不是方法签名.是一种封装了方法的类型.因此，委托声明应该有一个类似于它想要封装的方法的签名.何时使用 Delegate - 每当您想将方法传递给另一个函数时. 有关更多信息，请参阅 this 和 这个.

  • Delegate - it is not a method signature. It is a type which encapsulates a method. Hence a delegate declaration should have a signature similar to the method it wants to encapsulate. When to use Delegate - whenever you want to pass a method to another function. For more see this and this.

    Lambdas - 编写匿名函数的简写和更具表现力的方式.但还有更多.lambda 表达式也可以转换为表达式树.有关更多信息，请参阅this.

    Lambdas - short hand and more expressive way of writing an anonymous function. But there is more to it. A lambda expression can also be converted to an expression tree. For more see this.

    匿名函数 - 是的..就这样

    Action - 它是一个委托，可以封装一个不返回任何内容的函数.所以你应该把它想象成一种可以封装一个动作的类型，并在你需要传递一个动作时使用它.

    Action - It is a delegate which can encapsulate a function that returns nothing. So you should think of it as a type that can encapsulate an action and use it when you need to pass an action around.

    Func - 可以封装返回某些内容的函数的委托.但是您应该将其视为一种可以封装转换的类型，并在您想要传递转换时使用.

    Func - A delegate that can encapsulate a function that returns something. But you should look at it as a type that can encapsulate a transformation and use when you want to pass around a transformation.

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