using System;
using System.Collections.Generic; ----//--------///------------
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace ToLookup
{
public partial class Frm_Main : Form
{
public Frm_Main()
{
InitializeComponent();
}
private void Frm_Main_Load(object sender, EventArgs e)
{
//结构泛型列表
Listusers = new List{
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"}};
//运用LINQ查找用户代码小于3的列表
//此刻的query变量的类型是IEnumerable类型
var query = from item in users
where item.UserCode < 3
select item;
//运用ToLookup办法将query转换为一对多字典类型
ILookup
label1.Text = "ILookup的成果是：
";
foreach (var user in userLookup)//遍历查询成果
{
label1.Text += user.Key;//显现主键
label1.Text += " ";
foreach (var user2 in user)//遍历一切值
{
label1.Text += user2.UserName + " , ";//显现键值
}
label1.Text += "
";
}
}
}
public class UserInfo
{
public int UserCode { get; set; }//用户代码
public string UserName { get; set; }//用户称号
public string Password { get; set; }//暗码
}
}
