C＃：收益率的回报范围/收藏 [英] C#: yield return range/collection

问题描述

我用收益回报率关键字不少，但我觉得它缺乏时，我想一个范围添加到的IEnumerable 。下面是我想怎么做一个简单的例子：

I use the yield return keyword quite a bit, but I find it lacking when I want to add a range to the IEnumerable. Here's a quick example of what I would like to do:

IEnumerable<string> SomeRecursiveMethod()
{
    // some code 
    // ...
    yield return SomeRecursiveMethod();
}

当然，这导致一个错误，它可以做一个简单的循环来解决。有没有更好的方式来做到这一点？环路感觉有点笨重。

Naturally this results in an error, which can be resolved by doing a simple loop. Is there a better way to do this? A loop feels a bit clunky.

推荐答案

没有，有我不害怕。 F＃的确实的有支持这一产量，但在C＃中没有相应的 - 你必须使用循环，基本上是这样。对不起......我觉得你的痛苦。我在我Edulinq博客文章之一，它会作出简单的事情

No, there isn't I'm afraid. F# does support this with yield!, but there's no equivalent in C# - you have to use the loop, basically. Sorry... I feel your pain. I mentioned it in one of my Edulinq blog posts, where it would have made things simpler.

请注意，使用收益回报递归可能是昂贵的 - 看到的韦斯·戴尔对迭代器了解更多信息（以及提后四年前正在审议的产量的foreach ...）

Note that using yield return recursively can be expensive - see Wes Dyer's post on iterators for more information (and mentioning a "yield foreach" which was under consideration four years ago...)

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