获取类实现的泛型接口的类型参数

I have a generic interface, say IGeneric. For a given type, I want to find the generic arguments which a class imlements via IGeneric.

我有一个通用接口,比如IGeneric。对于给定的类型,我想找到一个类通过IGeneric实现的泛型参数。

It is more clear in this example:

在这个例子中更清楚:

Class MyClass : IGeneric<Employee>, IGeneric<Company>, IDontWantThis<EvilType> { ... }

Type t = typeof(MyClass);
Type[] typeArgs = GetTypeArgsOfInterfacesOf(t);

// At this point, typeArgs must be equal to { typeof(Employee), typeof(Company) }

What is the implementation of GetTypeArgsOfInterfacesOf(Type t)?

GetTypeArgsOfInterfacesOf(Type t)的实现是什么?

Note: It may be assumed that GetTypeArgsOfInterfacesOf method is written specifically for IGeneric.

注意:可以假设GetTypeArgsOfInterfacesOf方法是专门为IGeneric编写的。

Edit: Please note that I am specifically asking how to filter out IGeneric interface from all the interfaces that MyClass implements.

编辑:请注意我特别询问如何从MyClass实现的所有接口中过滤掉IGeneric接口。

相关:确定类型是否实现了通用接口

3 个解决方案

#1

To limit it to just a specific flavor of generic interface you need to get the generic type definition and compare to the "open" interface (IGeneric<> - note no "T" specified):

要将它限制为通用接口的特定风格,您需要获取泛型类型定义并与“open”接口进行比较(IGeneric <> - 注意没有指定“T”):

List<Type> genTypes = new List<Type>();
foreach(Type intType in t.GetInterfaces()) {
    if(intType.IsGenericType && intType.GetGenericTypeDefinition()
        == typeof(IGeneric<>)) {
        genTypes.Add(intType.GetGenericArguments()[0]);
    }
}
// now look at genTypes

Or as LINQ query-syntax:

或者作为LINQ查询语法:

Type[] typeArgs = (
    from iType in typeof(MyClass).GetInterfaces()
    where iType.IsGenericType
      && iType.GetGenericTypeDefinition() == typeof(IGeneric<>)
    select iType.GetGenericArguments()[0]).ToArray();

#2

typeof(MyClass)
    .GetInterfaces()
    .Where(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IGeneric<>))
    .SelectMany(i => i.GetGenericArguments())
    .ToArray();

#3

  Type t = typeof(MyClass);
            List<Type> Gtypes = new List<Type>();
            foreach (Type it in t.GetInterfaces())
            {
                if ( it.IsGenericType && it.GetGenericTypeDefinition() == typeof(IGeneric<>))
                    Gtypes.AddRange(it.GetGenericArguments());
            }


 public class MyClass : IGeneric<Employee>, IGeneric<Company>, IDontWantThis<EvilType> { }

    public interface IGeneric<T>{}

    public interface IDontWantThis<T>{}

    public class Employee{ }

    public class Company{ }

    public class EvilType{ }

#1