System.TypeExtensions.GetCommonBaseInterfaceType C# (CSharp) Метод

		public static Maybe<Type> GetCommonBaseInterfaceType(IEnumerable<Type> types)
		{
			return
				types.Select(t => t.GetInterfaces().Concat(t))
					.Aggregate((a, b) => a.Intersect(b))
					.OrderBy(x => x, LambdaComparer<Type>.Comparer(((a, b) =>
					{
						if (a != b)
						{
							if (a.IsAssignableFrom(b))
							{
								return 1;
							}
							if (b.IsAssignableFrom(a))
							{
								return -1;
							}
						}
						return 0;
					})))
					.FirstOrNothing();
		}
	}