[英]Delegates, Lambdas, Action, Func, Anonymous Functions
I just want to verify my understanding about the following 我只想验证我对以下内容的理解
hmm... they all do similar things, how do you define & know when to use each? 嗯...他们都做类似的事情,你如何定义和知道何时使用每个?
sorry, I don't explain well 对不起,我不好解释
Delegate - it is not a method signature. 委托 - 它不是方法签名。
It is a type which encapsulates a method
. It is a type which encapsulates a method
。 Hence a delegate declaration should have a signature similar to the method it wants to encapsulate. 因此,委托声明应该具有与其想要封装的方法类似的签名。
When to use Delegate - whenever you want to pass a method to another function.
For more see this and this . 欲了解更多看到这个和这个 。
Lambdas - short hand and more expressive way of writing an anonymous function. Lambdas - 写一个匿名函数的简短手和更具表现力的方式。 But there is more to it.
但还有更多。 A lambda expression can also be converted to an expression tree.
lambda表达式也可以转换为表达式树。 For more see this .
欲了解更多看到这个 。
Anonymous Function - yes .. just that 匿名函数 - 是的......就是这样
Action - It is a delegate which can encapsulate a function that returns nothing. Action - 它是一个委托,它可以封装一个不返回任何内容的函数。 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. 因此,您应该将其视为
a type that can encapsulate an action
并在需要传递操作时使用它。
Func - A delegate that can encapsulate a function that returns something. Func - 可以封装返回某些内容的函数的委托。 But you should look at it as
a type that can encapsulate a transformation
and use when you want to pass around a transformation. 但是您应该将其视为
a type that can encapsulate a transformation
并在您想要传递转换时使用。
Don't try to see C# + these features. 不要试图看到C#+这些功能。 Also because there is not a strict pragmatic answer to your question.
还因为对你的问题没有严格务实的答案。
Start from a functional programming point of view, for example try to learn F# to get inside what and when lambdas are used (actually everywhere inside a functional language) and then you'll understand things better. 从函数式编程的角度出发,例如尝试学习F#以获取内部使用lambdas的内容(实际上是函数式语言中的所有内容),然后您将更好地理解事物。
It will open your mind and make you think differently about imperative programming or mixed languages like C#. 它会打开你的思维,让你对命令式编程或C#等混合语言有不同的看法。
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