为什么试图理解代表感觉就像试图理解宇宙的本质? [英] Why does trying to understand delegates feel like trying to understand the nature of the universe?

问题描述

我读过两本书，有很多例子.他们对我来说仍然几乎没有意义.我可能会编写一些使用委托的代码，但我不知道为什么.我是唯一有这个问题的人，还是我只是个白痴?如果有人能真正向我解释我何时、何地以及为什么我会实际使用代理，我会永远爱你.

I've read two books, tons of examples. They still make next to no sense to me. I could probably write some code that uses delegates, but I have no idea why. Am I the only one with this problem, or am I just an idiot? If anyone can actually explain to me when, where, and why I would actually use a delegate, I'll love you forever.

推荐答案

委托只是在变量中传递函数的一种方式.

Delegates are just a way to pass around a function in a variable.

您传递一个委托函数来执行回调.比如在做异步 IO 的时候，你传递一个委托函数(一个你用委托参数写的函数)，当数据从磁盘读取出来时，它会被调用.

You pass a delegated function to do a callback. Such as when doing asynchronous IO, you pass a delegated function (a function you have written with the delegate parameter) that will be called when the data has been read off the disk.

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