Question

采取以下代码

（linq部分中的伪代码 - ＆gt; lstApples.Except（i =＆gt; i.id = Banana.ID）;）

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

delegate int NumberChanger(int n);

namespace ConsoleApplication1
{

    class Program
    {
        static void Main(string[] args)
        {
            List<Banana> lstBananas = new List<Banana>()
            {
                new Banana {IDBanana = 1, Name = "Mike", Surname = "x" },
                new Banana {IDBanana = 2, Name = "Mauro", Surname = "y" },
                new Banana {IDBanana = 3, Name = "Ciccio", Surname = "z" },
                new Banana {IDBanana = 4, Name = "Enzo", Surname = "w" }
            };

            List<Apple> lstApples = new List<Apple>()
            {
                new Apple {IDApple = 1, Brand = "Melinda", Type = "Golden" },
                new Apple {IDApple = 1, Brand = "Melinda", Type = "Tirolese" },
                new Apple {IDApple = 1, Brand = "Melinda", Type = "d" },
                new Apple {IDApple = 1, Brand = "Melinda", Type = "f" },
                new Apple {IDApple = 1, Brand = "Secure", Type = "r" },
                new Apple {IDApple = 1, Brand = "Melinda", Type = "g" },
                new Apple {IDApple = 1, Brand = "AllOver", Type = "Tirolese" },
                new Apple {IDApple = 1, Brand = "Valtellina", Type = "Rossa" },
                new Apple {IDApple = 1, Brand = "ThisOne", Type = "Verde" },
                new Apple {IDApple = 1, Brand = "Melinda", Type = "Blu" },
            };

            lstApples.Except(i => i.id = Banana.ID);
        }
    }


    public class Banana
    {
        public int IDBanana { get; set; }
        public string Name { get; set; }
        public string Surname { get; set; }
    }

    public class Apple
    {
        public int IDApple { get; set; }
        public string Brand { get; set; }
        public string Type { get; set; }
    }
}

我需要根据其他一些对象属性过滤出列表中的对象。

示例：当apple id与banana相同时，主要从列表中删除苹果** USUS EXCEPT **或其他方式

Linq让它变得麻烦。怎么做？

Answer 1

lstApples.Where(a=>!lstBananas.Any(b=>b.IDBanana == a.IDApple))

或者您也可以join

LINQ基于类似的类型属性比较和excude /包含不同的对象

1 个答案: