//构造泛型列表

List<UserInfo> users = new List<UserInfo> {

new UserInfo{UserCode=1, UserName="User001", Password="001"},

new UserInfo{UserCode=1, UserName="User002", Password="002"},

new UserInfo{UserCode=2, UserName="User003", Password="003"},

new UserInfo{UserCode=2, UserName="User004", Password="004"}

};

//使用LINQ查找用户代码小于3的列表

//此时的query变量的类型是IEnumerable<UserInfo>类型

var query = from item in users

where item.UserCode < 3

select item;

//使用ToLookup方法将query转换为一对多字典类型

ILookup<int,UserInfo> userLookup = query.ToLookup(itm => itm.UserCode);

Response.Write("ILookup的结果是：<br/>");

foreach (var user in userLookup)

{

Response.Write(user.Key);

Response.Write(" ");

foreach (var user2 in user)

{

Response.Write(user2.UserName + " , ");

}

Response.Write("<br/>");

}

 

public class UserInfo

{

public UserInfo()

{

//

//TODO: 在此处添加构造函数逻辑

//

}

public int UserCode { get; set; }

public string UserName { get; set; }

public string Password { get; set; }

}