如何获得MethodInfo的通用扩展方法？ [英] How to get MethodInfo for generic extension method?

问题描述

我有一个 IEnumerable< T> ，我想调用 Enumerable.Contains 方法。我只是努力争取正确的语法。这是我现在有的：

I have an IEnumerable<T>, and I want to call the Enumerable.Contains method by reflection. I'm just struggling to get the syntax right. Here's what I currently have:

var containsMethod = typeof(Enumerable).GetMethod("Contains", 
  new[] {
    typeof(IEnumerable<T>), 
    typeof(T) 
  });

这只是返回null。

获取 MethodInfo ？

推荐答案

的正确方法是什么？

获取MethodInfo的正确方法是什么？

What is the correct way to get the MethodInfo?

您必须找到 / em>方法 - 这不幸有点痛苦 - 然后用适当的参数构造它。在这种情况下，您知道只有2 Contains 重载，并且您想要的重载有两个参数，因此您可以使用：

You have to find the generic method - which is unfortunately a bit of a pain - and then construct that with the appropriate arguments. In this case you know that there are only 2 Contains overloads, and the one you want has two arguments, so you can use:

var method = typeof(Enumerable).GetMethods()
                               .Where(m => m.Name == "Contains")
                               .Single(m => m.GetParameters().Length == 2)
                               .MakeGenericMethod(typeof(T));

然后，您应该可以适当地调用它。

You should then be able to invoke it appropriately.

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