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  1. using static System.Console;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Program {
  6. 	public static void Main() {
  7. 		IList<VendaDevolucao> vendas = new List<VendaDevolucao>() {
  8. 			new VendaDevolucao { Id = 100, Venda = 230.00, Devolucao = 0 },
  9. 			new VendaDevolucao { Id = 100, Venda = 0, Devolucao = 50.00 },
  10. 			new VendaDevolucao { Id = 101, Venda = 515.00, Devolucao = 0 },
  11. 			new VendaDevolucao { Id = 101, Venda = 0, Devolucao = 42.00 },
  12. 		};		
  13. 		var junta = vendas.GroupBy(x => x.Id)
  14. 			.Select(x => new {
  15.                 Id = x.First().Id,
  16.                 Venda = x.Sum(v => v.Venda),
  17.                 Devolucao = x.Sum(v => v.Devolucao)
  18.             });
  19. 		foreach (var item in junta.ToList()) WriteLine($"{item.Id} -> {item.Venda}, {item.Devolucao}");
  20. 	}
  21. }
  22.  
  23. public class VendaDevolucao {
  24.     public virtual int Id { get; set; }
  25.     public virtual double Venda { get; set; }
  26.     public virtual double Devolucao { get; set; }
  27. }
  28.  
  29. //https://pt.stackoverflow.com/q/134044/101
Success #stdin #stdout 0.02s 17776KB
comments (?)
stdin 
Standard input is empty
stdout 
100 -> 230, 50
101 -> 515, 42
https://ideone.com/9SCaVZ
language:
C# (gmcs 5.20.1)
created:
5 years ago
visibility:
public

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