扩展方法和动态对象 [英] Extension method and dynamic object

问题描述

我要总结一下我的问题分为以下code片段。

I am going to summarize my problem into the following code snippet.

List<int> list = new List<int>() { 5, 56, 2, 4, 63, 2 };
Console.WriteLine(list.First());

以上code是工作的罚款。

Above code is working fine.

现在我尝试以下

dynamic dList = list;
 Console.WriteLine(dList.First());

但我正在逐渐RuntimeBinderException.Why会这样呢？

but I am getting RuntimeBinderException.Why is it so?

推荐答案

要扩大Stecya的答案...扩展方法，并没有以扩展方法的形式动态类型的支持的，即所谓的如同它们是实例方法。然而，这将工作：

To expand on Stecya's answer... extension methods aren't supported by dynamic typing in the form of extension methods, i.e. called as if they were instance methods. However, this will work:

dynamic dList = list;
Console.WriteLine(Enumerable.First(dList));

当然，这可能会或可能不会是有用的。如果你能提供有关为什么和怎样你要使用动态类型的更多信息，我们也许能够帮助更多的。

Of course, that may or may not be useful. If you could give more information about why and how you're trying to use dynamic typing, we may be able to help more.

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