判断一个变量是否是某种基本类型.

        public static void Judge(object ma)
        {
            var ta = ma.GetType();  //通过Type可以对传入的参数类型进行基本类型的判断
            Console.WriteLine(ta.IsEnum);    //枚举
            Console.WriteLine(ta.IsValueType);   //值类型
            Console.WriteLine(ta.IsInterface);   //接口
            Console.WriteLine(ta.IsClass);     //引用类型
            Console.WriteLine();

            Console.WriteLine(ma is Enum);
            Console.WriteLine(ma is ValueType);
            Console.WriteLine(ma is object); //必然为真
            //Console.WriteLine(ma is interface);  //不实例化Type,怎么判断是否变量是否是接口?
        }