c#字符串值类型与引用类型比较示例
时间:2021-12-19 04:26:33
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; }
}
相同的结构,不同的结果。
证明string是引用类型
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;
}
}