c#擷取多個List<class>合并、並將相同條件下的值累計sum

標籤：style   blog   color   io   os   ar   for   sp   div   

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            List<strudent> one = new List<strudent>();            one.Add(new strudent() { age = 2, name = "aaa" });            one.Add(new strudent() { age = 1, name = "bbb" });            one.Add(new strudent() { age = 3, name = "ddd" });            one.Add(new strudent() { age = 55, name = "fff" });            one.Add(new strudent() { age = 2, name = "ggg" });            one.Add(new strudent() { age = 12, name = "eee" });            List<strudent> two = new List<strudent>();            two.Add(new strudent() { age = 11, name = "aaa" });            two.Add(new strudent() { age = 22, name = "bbb" });            two.Add(new strudent() { age = 33, name = "ddd" });            two.Add(new strudent() { age = 55, name = "fff" });            two.Add(new strudent() { age = 44, name = "ggg" });            two.Add(new strudent() { age = 22, name = "eee" });            two.Add(new strudent() { age = 22, name = "aaaaa" });            var tt = one.Union(two).ToList();            var res = from p in tt                      group p by new { p.name } into g                      select new { name = g.Key.name, accp = g.Sum(p => p.age) };            tt.ForEach(x =>            {                Console.WriteLine(x.name + "     " + x.age);            });            Console.ReadKey();        }    }    public class strudent    {        public decimal age { get; set; }        public string name { get; set; }    }    public class StudentListEquality : IEqualityComparer<strudent>    {        public bool Equals(strudent x, strudent y)        {            return x.name == y.name;        }        public decimal sum(strudent x, strudent y)        {            if (x.name == y.name)            {                return x.age + y.age;            }            return 0;        }        public int GetHashCode(strudent obj)        {            if (obj == null)            {                return 0;            }            else            {                return obj.ToString().GetHashCode();            }        }    }}

 

c#擷取多個List<class>合并、並將相同條件下的值累計sum