我需要更多的上下文，但如果你只是得到一个索引，使您可以拨打 .Skip ，我会建议采取看看 .SkipWhile 。

I'd need more context, but if you're just getting an index so that you can call .Skip, I would recommend taking a look at .SkipWhile.

如果你真正需要的指数，我建议编写自己的 .IndexOf 扩展方法。

If you do really need the index, I'd suggest writing your own .IndexOf extension method.