.NET get a list of types that implement a (non-specific) generic interface.

ReflectionUtil.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace Reflection
{
    public interface IGenericInterface<T>
    {
        
    }

    public static class ReflectionUtil
    {
        public static IEnumerable<Type> GetTypesHavingGenericInterface(Assembly assembly)
        {
            if (null == assembly)
            {
                throw new ArgumentNullException("assembly");
            }

            return
                from type in assembly.GetTypes()
                where
                    type.GetInterfaces().Any(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IGenericInterface<>)) &&
                    type.IsClass
                select type;
        }
    }
}