yield 语句实现

I want to know everything about the yield statement, in an easy to understand form.

我已经阅读了 yield 语句及其在实现迭代器模式时的易用性.但是，大部分都非常干燥.我想深入了解一下微软是如何处理收益率的.

I have read about the yield statement and its ease when implementing the iterator pattern. However, most of it is very dry. I would like to get under the covers and see how Microsoft handles return yield.

另外，你什么时候使用yield break?

Also, when do you use yield break?

推荐答案

yield 通过在内部构建状态机来工作.它会在例程退出时存储该例程的当前状态，并在下次从该状态恢复时存储.

yield works by building a state machine internally. It stores the current state of the routine when it exits and resumes from that state next time.

您可以使用 Reflector 查看编译器是如何实现的.

You can use Reflector to see how it's implemented by the compiler.

yield break 当你想停止返回结果时使用.如果您没有 yield break，编译器会在函数末尾假定一个(就像普通函数中的 return; 语句一样)

yield break is used when you want to stop returning results. If you don't have a yield break, the compiler would assume one at the end of the function (just like a return; statement in a normal function)

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