C# 通过反射获取扩展方法

注意，扩展方法本质上是静态方法，所以拿到MethodInfo时，应该这么调用 methodInfo.Invoke(null, new object[]{params})

static IEnumerable<MethodInfo> GetExtensionMethods(Assembly assembly, Type extendedType)
        {
            var query = from type in assembly.GetTypes()
                        where !type.IsGenericType && !type.IsNested
                        from method in type.GetMethods(BindingFlags.Static
                            | BindingFlags.Public | BindingFlags.NonPublic)
                        where method.IsDefined(typeof(System.Runtime.CompilerServices.ExtensionAttribute), false)
                        where method.GetParameters()[0].ParameterType == extendedType
                        select method;
            return query;
        }