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

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

new UserInfo{UserCode=2, UserName="User002", Password="002"},

new UserInfo{UserCode=3, UserName="User003", Password="003"},

new UserInfo{UserCode=4, UserName="User004", Password="004"}

};

//使用LINQ查找用户代码大于2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 > 2

                 select item;

//使用ToDictionary方法将query转换为字典类型

Dictionary<int,UserInfo> userDict = query.ToDictionary(itm => itm.UserCode);

Response.Write("Dictionary的结果是：");

foreach (var user in userDict)

{

string temp = string.Format("(Key:{0},Value:{1})", user.Key, user.Value.UserName);

Response.Write(temp);

}

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; }

}