找出一个类型是否实现了泛型接口 [英] Finding out if a type implements a generic interface

问题描述

假设我有一个类型，MyType.我想做以下事情:

Let's say I have a type, MyType. I want to do the following:

1. 找出 MyType 是否为某些 T 实现了 IList 接口.
2. 如果 (1) 的答案是肯定的，找出 T 是什么.

似乎这样做的方法是 GetInterface()，但这只能让您按特定名称进行搜索.有没有办法搜索所有 IList 形式的接口"(如果可能的话，如果接口是 IList 的子接口，它也很有用.)

It seems like the way to do this is GetInterface(), but that only lets you search by a specific name. Is there a way to search for "all interfaces that are of the form IList" (If possible it woudl also be useful if it worked if the interface was a subinterface of IList.)

相关:如何确定如果一个类型实现了一个特定的泛型接口类型

推荐答案

// this conditional is necessary if myType can be an interface,
// because an interface doesn't implement itself: for example,
// typeof (IList<int>).GetInterfaces () does not contain IList<int>!
if (myType.IsInterface && myType.IsGenericType && 
    myType.GetGenericTypeDefinition () == typeof (IList<>))
    return myType.GetGenericArguments ()[0] ;

foreach (var i in myType.GetInterfaces ())
    if (i.IsGenericType && i.GetGenericTypeDefinition () == typeof (IList<>))
        return i.GetGenericArguments ()[0] ;

即使 myType 实现了 IDerivedFromList<> 但不是直接实现 IList<>，IList<> 将显示在 GetInterfaces() 返回的数组中.

Even if myType implements IDerivedFromList<> but not directly IList<>, IList<> will show up in the array returned by GetInterfaces().

更新:添加了对myType 是相关通用接口的边缘情况的检查.

Update: added a check for the edge case where myType is the generic interface in question.

这篇关于找出一个类型是否实现了泛型接口的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！