Trials, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Linq;
namespace Rextester
{
    public class ids{
        public string name;
        public string id;
    }
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            List<ids> collectionofids = new List<ids>();
            var id = new ids();
            id.name = "nandhini";  
            id.id = "1";
            collectionofids.Add(id);
            var ids = new ids();
            ids.name = "priya";  
            ids.id = "1";
            collectionofids.Add(ids);     
            var dict = collectionofids.Aggregate(new Dictionary<string,List<ids>>(),(p,c)=>{
                if(p.ContainsKey(c.id)){
                    p[c.id].Add(c);
                }
                else{
                    p[c.id] = new List<ids>(){id};
                }
                return p;
            });
            
            int i=1;
            foreach(var a in dict){
                Console.WriteLine(i++);
                Console.Write("=>key:"+a.Key);
                var c = dict[a.Key];
                Console.Write("Value:");
                foreach(var b in c)
                {
                    Console.Write(b.name,",");
                }
            }
        }
    }
}

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