首先，公共类Foo: IFoo<T>{}不能编译，因为你需要指定一个类而不是T，但假设你做的事情类似于公共类Foo: IFoo<SomeClass> {}

如果你这样做了

Foo f = new Foo();
IBar<SomeClass> b = f as IBar<SomeClass>;

if(b != null)  //derives from IBar<>
    Blabla();

以下内容应该没有任何问题:

bool implementsGeneric = (anObject.Implements("IBar`1") != null);

如果您想为IBar查询提供一个特定的泛型类型参数，您可以捕获AmbiguousMatchException。

您必须检查泛型接口的构造类型。

你必须这样做:

foo is IBar<String>

因为IBar<String>表示构造的类型。你必须这样做的原因是，如果T在检查中是未定义的，编译器不知道你是指IBar<Int32>还是IBar<SomethingElse>。

public interface IFoo<T> : IBar<T> {}
public class Foo : IFoo<Foo> {}

var implementedInterfaces = typeof( Foo ).GetInterfaces();
foreach( var interfaceType in implementedInterfaces ) {
    if ( false == interfaceType.IsGeneric ) { continue; }
    var genericType = interfaceType.GetGenericTypeDefinition();
    if ( genericType == typeof( IFoo<> ) ) {
        // do something !
        break;
    }
}

作为辅助方法扩展

public static bool Implements<I>(this Type type, I @interface) where I : class
{
    if(((@interface as Type)==null) || !(@interface as Type).IsInterface)
        throw new ArgumentException("Only interfaces can be 'implemented'.");

    return (@interface as Type).IsAssignableFrom(type);
}

使用示例:

var testObject = new Dictionary<int, object>();
result = testObject.GetType().Implements(typeof(IDictionary<int, object>)); // true!

为了完全解决类型系统，我认为你需要处理递归，例如，IList<T>: ICollection<T>: IEnumerable<T>，否则你不会知道IList<int>最终实现了IEnumerable<>。

    /// <summary>Determines whether a type, like IList&lt;int&gt;, implements an open generic interface, like
    /// IEnumerable&lt;&gt;. Note that this only checks against *interfaces*.</summary>
    /// <param name="candidateType">The type to check.</param>
    /// <param name="openGenericInterfaceType">The open generic type which it may impelement</param>
    /// <returns>Whether the candidate type implements the open interface.</returns>
    public static bool ImplementsOpenGenericInterface(this Type candidateType, Type openGenericInterfaceType)
    {
        Contract.Requires(candidateType != null);
        Contract.Requires(openGenericInterfaceType != null);

        return
            candidateType.Equals(openGenericInterfaceType) ||
            (candidateType.IsGenericType && candidateType.GetGenericTypeDefinition().Equals(openGenericInterfaceType)) ||
            candidateType.GetInterfaces().Any(i => i.IsGenericType && i.ImplementsOpenGenericInterface(openGenericInterfaceType));

    }