检查对象列表中的所有属性是否相等

Question

似乎我正在以一种迂回的方式检查Id是否都相等，是否有更简洁易懂的检查方法？

像一个完整的外连接和检查空值？

具体这部分：

if (masters1.Count() != masters1.Intersect(masters2).Count())
{
    throw new Exception("one IDs did not match two IDs");
}

if (masters2.Count() != masters2.Intersect(masters3).Count())
{
    throw new Exception("two IDs did not match three IDs");
}

完整示例：

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.SqlClient;
using System.Linq;


        public class Record
        {
            public string Id;
            public string Value;
        }

        public class Records
        {
            public Record One;
            public Record Two;
            public Record Three;
        }

public class Program
{
    public static void Main()
    {
        var one = new List<Record>(){new Record(){Id = "one", Value = "1"},new Record(){Id = "two", Value = "2"}};
        var two = new List<Record>(){new Record(){Id = "one", Value = "1"},new Record(){Id = "two", Value = "2"}};
        var three = new List<Record>(){new Record(){Id = "one", Value = "1"},new Record(){Id = "two", Value = "2"}};

        var masters1 = one.Select(x => x.Id);
        var masters2 = two.Select(x => x.Id);
        var masters3 = three.Select(x => x.Id);


        if (masters1.Count() != masters1.Intersect(masters2).Count())
        {
            throw new Exception("one IDs did not match two IDs");
        }

        if (masters2.Count() != masters2.Intersect(masters3).Count())
        {
            throw new Exception("two IDs did not match three IDs");
        }

        var rv = new List<Records>();
        foreach (var master in masters1)
        {
            var record = new Records()
            {
                One = one.Single(x => x.Id == master),
                Two = two.Single(x => x.Id == master),
                Three = three.Single(x => x.Id == master),
            };

            rv.Add(record);
        }


        foreach(var x in rv){
            Console.WriteLine(x.One.Value); 
            Console.WriteLine(x.Two.Value); 
            Console.WriteLine(x.Three.Value);   
        }

    }
}

见这里： https : //dotnetfiddle.net/QtjM7x

Answer 1

AFAIU，你需要像这样。 所以代码将如下所示：

if (masters1.SequenceEqual(masters2)) DoSomething();

请注意， SequenceEqual 使用默认的相等比较器，因此您需要覆盖 Equals() 以添加自定义比较逻辑。