=================================================EmployeeID.cs（学生编号类）
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication7
{
//作为键的类型必须要重写GetHashCode()
public class EmployeeID : IEquatable
{
public string ID { get; private set; }
public EmployeeID(string s)
{
ID = s;
}
public override bool Equals(object obj)
{
if (obj == null) throw new ArgumentException("对象不能为空");
return this.Equals(obj as EmployeeID);
}
public override int GetHashCode()
{
return 1;
}
public bool Equals(EmployeeID other)
{
return this.ID == other.ID;
}
}
} =================================================Student.cs（学生类）
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication7
{
public class Student
{
public string Name { get; private set; }
public EmployeeID ID { get; private set; }
public Student(EmployeeID id, string name)
{
this.Name = name;
this.ID = id;
}
}
}=================================================主程序
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication7
{
class Program
{
static void Main(string[] args)
{
Dictionary d = new Dictionary();
var ID1 = new EmployeeID("Z001");
var Stu1 = new Student(ID1, "张飞");
d.Add(ID1, Stu1);
var ID2 = new EmployeeID("Z002");
var Stu2 = new Student(ID2, "关羽");
d.Add(ID2, Stu2);
var ID3 = new EmployeeID("Z003");
var Stu3 = new Student(ID3, "曹操");
d.Add(ID3, Stu3);
var ID4 = new EmployeeID("Z004");
var Stu4 = new Student(ID4, "赵云");
d.Add(ID4, Stu4);
var ID5 = new EmployeeID("Z005");
var Stu5 = new Student(ID5, "马超");
d.Add(ID5, Stu5);
while (true)
{
string str = Console.ReadLine();
if (str.ToLower() == "exit") return;
Student s;
EmployeeID ei = null;
ei = new EmployeeID(str);
if (!d.TryGetValue(ei, out s))//判断是否存在键对应的相关的值
{
Console.WriteLine("没有找到该学生");
}
else
{
Console.WriteLine(d[ei].Name);
}
}
}
}
} 
