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Fórum ➡ GroupJoin'ing Books and Orders ♦
//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; // aljodav // http://rextester.com/users/376 // in reply to the MSDN Forum thread // http://bit.ly/2ebf3Vg namespace Rextester { using T2=Tuple<int,string>; using T3=Tuple<int,int,string>; using BooksList=List<Tuple<int,string>>; using OrdersList=List<Tuple<int,int,string>>; class Program { static IEnumerable<T2> GetBooks(){ // Book ➡ BookId, Title yield return Tuple.Create(1,"DevCurry Tips"); yield return Tuple.Create(2,".NET & COM"); yield return Tuple.Create(3,"jQuery Recipes"); yield return Tuple.Create(4,"Motivational Gurus"); yield return Tuple.Create(5,"Spiritual Gurus"); yield break; } static IEnumerable<T3> GetOrders(){ // Order ➡ OrderId, BookId, PaymentMode yield return Tuple.Create(1,1,"Cheque"); yield return Tuple.Create(2,5,"Credit"); yield return Tuple.Create(3,1,"Cash"); yield return Tuple.Create(4,3,"Cheque"); yield return Tuple.Create(5,3,"Cheque"); yield return Tuple.Create(6,4,"Cash"); yield break; } public static void Main(string[] args) { IEnumerable<T2> outerBooks=GetBooks(); IEnumerable<T3> innerOrders=GetOrders(); outerBooks .GroupJoin(innerOrders, book=>book.Item1, order=>order.Item2, (book,orders)=>new{ Title=book.Item2, OrderIds=orders.Select(x=>x.Item1), PaymentMode=orders.Select(x=>x.Item3) }) .ToList() .ForEach(x=>{ Console.Write("\n\nBook Title: {0}\n\tOrders Id: ",x.Title); x.OrderIds.ToList().ForEach(y=>Console.Write("{0} ",y)); Console.Write("\n\tPayment Mode: "); x.PaymentMode.ToList().ForEach(y=>Console.Write("{0} ",y)); }); Console.WriteLine("\n\nHello, world!"); } } }
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