C#索引器的详细用法

关于C#索引器的基本用法

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Collections;

namespace 索引器

{

class Program

{

static void Main(string[] args)

{

B b = new B();

A a = new A();

a[0] = "李四";

a[1] ="王五";

Console.WriteLine("a0是" + a[0] );

Console.WriteLine("a1是" + a[1] );

b[0] = "李四";

b[1] = "王五";

b[2] = "马六";

Console.WriteLine("b0是" + b[0]);

Console.WriteLine("b1是" + b[1]);

Console.WriteLine("李四是" + b["李四"] + "号");

Console.WriteLine("王五是" + b["王五"] + "号");

Console.ReadLine();

}

}

class A

{

public ArrayList list = new ArrayList();

public string this[int id]

{

get

{

foreach(C a in list)

{

if(a.Id==id)

{

return a.Name;

}

}

return null;

}

set

{

list.Add(new C(value,id));

}

}

}

class C

{

private string m_Name;

private int m_Id;

public string Name

{

get

{

return m_Name;

}

set

{

m_Name = value;

}

}

public int Id

{

get

{

return m_Id;

}

set

{

m_Id = value;

}

}

public C(string n, int i)

{

this.m_Name = n;

this.m_Id = i;

}

}

class B

{

private Hashtable people = new Hashtable();

//根据名字找ID

public int this[string nm]

{

get

{

foreach (DictionaryEntry p in people)

{

if (p.Value.ToString() == nm)

{

return int.Parse(p.Key.ToString());

}

}

return -1;

}

set

{

people.Add(value, nm);

}

}

//根据ID找名字

public string this[int id]

{

get

{

return people[id].ToString();

}

set

{

people.Add(id, value);

}

}

}

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Collections;

namespace 索引器2

{

class Program

{

static void Main(string[] args)

{

B b = new B();

b[1, "李四"] = 39;

b[2, "王五"] = 40;

Console.WriteLine("今年李四" + b[1, "李四"]+"岁");

Console.WriteLine("今年王五" + b[2, "王五"] + "岁");

Console.ReadLine();

}

}

class A

{

private int m_Id;

public int Id

{

get { return m_Id; }

set { m_Id = value; }

}

private string m_Name;

public string Name

{

get { return m_Name; }

set { m_Name = value; }

}

private int m_Age;

public int Age

{

get { return m_Age; }

set { m_Age = value; }

}

public A(int id, string name, int age)

{

this.m_Id = id;

this.m_Name = name;

this.m_Age = age;

}

}

class B

{

ArrayList list = new ArrayList();

public int this[int id, string name]

{

get

{

foreach (A a in list)

{

if(a.Id==id&&a.Name==name)

{

return a.Age;

}

}

return -1;

}

set

{

list.Add(new A(id, name, value));

}

}

}

}