业务场景:
对集合分组,求和
using System;
using System.Collections.Generic;
using System.Linq;
namespace Test
{
class Program
{
static void Main(string[] args)
{
JhInfo jh01 = new JhInfo() { xmbh = "xm01", htbh = "ht01", name = "甲", amount = 11 };
JhInfo jh02 = new JhInfo() { xmbh = "xm01", htbh = "ht01", name = "乙", amount = 6 };
JhInfo jh03 = new JhInfo() { xmbh = "xm01", htbh = "ht02", name = "丙", amount = 9 };
List<JhInfo> list = new List<JhInfo>();
list.Add(jh01);
list.Add(jh02);
list.Add(jh03);
// 对集合 按 xmbh 和 htbh 分组,对name多值拼接,对amount求和
List<JhInfo> aa = list.GroupBy(x => new { x.xmbh, x.htbh }).Select(y => new JhInfo{
xmbh = y.Key.xmbh,
htbh = y.Key.htbh,
name = string.Join(",", y.Select(x => x.name).ToArray()),
amount = y.Sum(x => x.amount)
}).ToList();
foreach (JhInfo a in aa)
{
Console.WriteLine("name:【" + a.name + "】Count: 【" + a.amount + "】");
}
// 从集合查找
JhInfo findOne = list.Find(x => x.name.Equals("甲"));
List<JhInfo> findAll = list.FindAll(x => x.xmbh.Equals("xm01"));
}
}
class JhInfo
{
public string xmbh { get; set; }
public string htbh { get; set; }
public string name { get; set; }
public int amount { get; set; }
}
}
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