判断一个OBject类型是值类型还是引用类型

“根据定义，所有的值类型都必须从System.ValueType派生，所有的枚举都从System.Enum抽象类型中派生，后者又从System.ValueType派生的”                               -------摘自《CLR VIA C#》；

可以通过查找MSDN

测试代码：

 class Program
    {

        static void Main(string[] args)
        {
            Program p = new Program();

            int m = 1;
            Console.WriteLine("int m=1");
            p.function(m);
            double n = 2.44;
            Console.WriteLine("double n = 2.44");
            p.function(n);
            string x = "dasdas";
            Console.WriteLine("string x");
            p.function(x);
            M mm = new M();
            Console.WriteLine("M为结构体");
            p.function(mm);
            Console.WriteLine("Program p ");
            p.function(p);
            Console.ReadLine();
        }

        public void function(Object o)
        {

          if (o.GetType().IsValueType)
                Console.WriteLine( "类型:" + o + "为值类型");
            else
               Console.WriteLine( "类型:" +o + "为引用类型");
        }

    }
    public struct M
    {
        int x;
        int y;
    }

输出结果：