Actualización de unión de LINQ sin crear nuevos
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Assert = Xunit.Assert;
namespace Research.Rli.Tests
{
public class Appointment
{
public int Id { get; set; }
public string Location { get; set; }
}
[TestClass]
public class ResearchTester
{
[TestMethod]
public void Should_update_appointments()
{
var appointments1 = new List<Appointment>
{
new Appointment { Id = 1, Location = "" },
new Appointment { Id = 2, Location = "" },
new Appointment { Id = 3, Location = "" }
};
var appointments2 = new List<Appointment>
{
new Appointment { Id = 1, Location = "My location 1" },
new Appointment { Id = 3, Location = "My location 3" }
};
Func<Appointment, Appointment, Appointment> UpdateLocation
= ((a, b) => { if (b != null) { a.Location = b.Location; } return a; });
var updatedAppointmets =
(
from a1 in appointments1
join a2 in appointments2 on a1.Id equals a2.Id into g
from g1 in g.DefaultIfEmpty(null)
select UpdateLocation(a1, g1)
).ToList();
foreach (Appointment a in updatedAppointmets)
{
Console.WriteLine
(
string.Format("Id [{0}] Location [{1}]", a.Id, a.Location)
);
}
// Output:
// Id [1] Location [My location 1]
// Id [2] Location []
// Id [3] Location [My location 3]
}
}
}
Jamy Pad