classProgram {     staticvoid Main()     {         int a = 9;    //给变量a赋值为9         int b = a;   //将a的副本给变量b         b = 10;         Console.WriteLine(string.Format("a={0},b={1}", a, b));         Person ZS = newPerson();       //张三         ZS.Age = 99;           //张三的年龄是99         Person SM = ZS;        //三毛等于张三，即张三和三毛就是同一个人         SM.Age = 100;      //三毛年龄变成100,张三也就变成了100        Console.WriteLine(string.Format("A={0},B={1}", ZS.Age, SM.Age));         Console.ReadKey();     } } classPerson {     publicint Age { get; set; } }

using System; classProgram {     staticvoid Main()     {         int n = 99;         Console.WriteLine("Before：n={0}", n.GetHashCode());         //此时获取到的哈希码值就是n的变量值         GetInt(n);         string s = "Hello";         Console.WriteLine("Before：s={0}", s.GetHashCode());         GetString(s);         Console.ReadKey();     }     staticint GetInt(int n)     {         Console.WriteLine("After：m={0}", n.GetHashCode());         //传过来的是变量值，说明这是值传递         return n;     }     staticstring GetString(string s)     {         Console.WriteLine("After：s={0}", s.GetHashCode());         //传过来的是地址而不"Hello"，说明这时引用传递         return s;     } }