Linq C# wo Bedingungsliste

Question

ich einfach Klasse Modellauto mit zwei Feldern haben

public class Car 
{ 
    public string CarBrand { get; set; } 
    public List<CarModel> carModel;   
} 

public class CarModel 
{ 
    public string Name { get; set; } 
    public string YearOfProduction{ get; set; } 
} 

Nun ist meine Frage, wie neue Liste der Autos Liste zu bekommen, wo YearOfProduction nur zum Beispiel 2016.

Answer 1

wenn Sie eine Liste von Auto brauchen, wenn mindestens einer der Fahrzeugmodelle zu einem bestimmten Jahr gehören, können Sie dies tun:

var temp = cars.Where(c=>c.CarModels.Any(cm=>cm.YearOfProduction== Year)).ToList(); 

wenn alle Pkw-Modelle in diesem Jahr gehören, haben dannverwendenErweiterung Methode anstelle Any:

var temp = cars.Where(c=>c.CarModels.All(cm=>cm.YearOfProduction== Year)).ToList(); 

Answer 2

Sie suchen die Any Funktion:

cars.Where(c => c.carModel.Any(cm => cm.YearOfProduction == 2016)); 

Answer 3

können Sie existiert für diese Abfrage-Methode verwenden. Überprüfen Sie das folgende Beispiel.

using System; 
using System.Collections.Generic; 
using System.Linq; 

namespace ConsoleApplication1 
{ 
    public class Car 
    { 
     public string CarBrand { get; set; } 
     public List<CarModel> carModel; 
    } 

    public class CarModel 
    { 
     public string Name { get; set; } 
     public string YearOfProduction { get; set; } 
    } 

    class Program 
    { 
     static void Main(string[] args) 
     { 
      var list = new List<Car>(); 
      list.Add(
       new Car 
        { 
         CarBrand = "Ford", 
         carModel = new List<CarModel>{ 
          new CarModel{Name="Fiesta", YearOfProduction="2010"}, 
          new CarModel{Name="Fiesta", YearOfProduction="2011"}, 
          new CarModel{Name="Fiesta", YearOfProduction="2012"}, 
          new CarModel{Name="Fiesta", YearOfProduction="2013"}, 
          new CarModel{Name="Fiesta", YearOfProduction="2014"}, 
          new CarModel{Name="Fiesta", YearOfProduction="2015"}, 
          new CarModel{Name="Fiesta", YearOfProduction="2016"}, 
          new CarModel{Name="Mondeo", YearOfProduction="2010"}, 
          new CarModel{Name="Mondeo", YearOfProduction="2011"}, 
          new CarModel{Name="Mondeo", YearOfProduction="2012"}, 
          new CarModel{Name="Mondeo", YearOfProduction="2013"}, 
          new CarModel{Name="Mondeo", YearOfProduction="2014"}, 
          new CarModel{Name="Mondeo", YearOfProduction="2015"}, 
          new CarModel{Name="Mondeo", YearOfProduction="2016"}, 
          new CarModel{Name="Focus", YearOfProduction="2010"}, 
          new CarModel{Name="Focus", YearOfProduction="2011"}, 
          new CarModel{Name="Focus", YearOfProduction="2012"}, 
          new CarModel{Name="Focus", YearOfProduction="2013"}, 
          new CarModel{Name="Focus", YearOfProduction="2014"}, 
          new CarModel{Name="Focus", YearOfProduction="2015"}, 

         } 
        } 

        ); 
      list.Add(new Car 
        { 
         CarBrand = "Volkswagen", 
         carModel = new List<CarModel>{ 
          new CarModel{Name="Polo", YearOfProduction="2010"}, 
          new CarModel{Name="Polo", YearOfProduction="2011"}, 
          new CarModel{Name="Polo", YearOfProduction="2012"}, 
          new CarModel{Name="Polo", YearOfProduction="2013"}, 
          new CarModel{Name="Polo", YearOfProduction="2014"}, 
          new CarModel{Name="Polo", YearOfProduction="2015"}, 
          new CarModel{Name="Golf", YearOfProduction="2010"}, 
          new CarModel{Name="Golf", YearOfProduction="2011"}, 
          new CarModel{Name="Golf", YearOfProduction="2012"}, 
          new CarModel{Name="Golf", YearOfProduction="2013"}, 
          new CarModel{Name="Golf", YearOfProduction="2014"}, 
          new CarModel{Name="Golf", YearOfProduction="2015"}, 
          new CarModel{Name="Passat", YearOfProduction="2010"}, 
          new CarModel{Name="Passat", YearOfProduction="2011"}, 
          new CarModel{Name="Passat", YearOfProduction="2012"}, 
          new CarModel{Name="Passat", YearOfProduction="2013"}, 
          new CarModel{Name="Passat", YearOfProduction="2014"}, 
          new CarModel{Name="Passat", YearOfProduction="2015"}, 

         } 
        }); 

      var newCars = list.Where(s => s.carModel.Exists(m => m.YearOfProduction == "2016")); 

      foreach (var brand in newCars) 
      { 
       foreach (var model in brand.carModel) 
       { 
        Console.WriteLine("Brand:{0}, Model:{1}, YearOfPrd:{2}", brand.CarBrand, model.Name, model.YearOfProduction); 

       } 
      } 
      Console.ReadLine(); 
     } 
    } 
}