不能踏进返回的IEnumerable℃的方法; T&GT ;? [英] Cannot step into a method returning IEnumerable<T>?

问题描述

我有一个返回一个IEnumerable这样的方法。

I have a method that returns an IEnumerable like this..

public virtual IEnumerable<Page> ToPages(){
  // foreach logic
  yield return pages;

  // more foreach logic
  yield return otherPages;

  // etc
}

的方法似乎工作... 在某种方式。但真正令人费解的是，我不能踏进去！我把调试点周围的一切，并且调试器只是通过他们传递正确的！

The method seems to work ... in a way. But what's really baffling is that I cannot step into it! I place debugger points all around, and the debugger just passes right through them!!!

有谁知道为什么会发生？

Does anyone know why this might occur?

推荐答案

的方法不运行，直到您列举了进去。

The method isn't run until you enumerate into it.

foo.ToPages().ToList() // will enumerate and your breakpoint will be hit.

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