Tuple與匿名型別偷吃步的比較方式，只比較特定值

gistfile1.cs

using System;
using System.Collections.Generic;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Linq;

namespace CollectionAssertSample
{
    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestMethod1()
        {
            var expected = new List<OwnExpenseHPatientDoctorViewModel>();
            expected.Add(new OwnExpenseHPatientDoctorViewModel()
            {
                AccountsCost = 2000,
                DoctorName = "徐勵生",
                OwnId = "2014050001",
                PaidCost = 700,
                PatientName = "test",
                UnpaidCost = 1200
            });
            expected.Add(new OwnExpenseHPatientDoctorViewModel()
            {
                AccountsCost = 0,
                DoctorName = "謝佳臻",
                OwnId = "2014050001",
                PaidCost = 100,
                PatientName = "test",
                UnpaidCost = 0
            });
            var actual = new List<OwnExpenseHPatientDoctorViewModel>();
            actual.Add(new OwnExpenseHPatientDoctorViewModel()
            {
                AccountsCost = 2000,
                DoctorName = "徐勵生",
                OwnId = "2014050001",
                PaidCost = 700,
                PatientName = "test",
                UnpaidCost = 1200
            });
            actual.Add(new OwnExpenseHPatientDoctorViewModel()
            {
                AccountsCost = 0,
                DoctorName = "謝佳臻",
                OwnId = "2014050001",
                PaidCost = 100,
                PatientName = "test",
                UnpaidCost = 0
            });
            //var actual = await service.GetOwnReport(StartDate, EndDate, "", "All");          
            //Assert.IsTrue(expected.SequenceEqual(actual));

            //default compare by reference should be false
            Assert.IsFalse(expected.SequenceEqual(actual));

            //正規作法
            Assert.IsTrue(expected.SequenceEqual(actual, new OwnExpenseHPatientDoctorViewModelEqualityComparer()), "IEqualityComparer比較集合是否相等");

            //Tuple比較，只比較特定property值
            var expectdTuple = expected.Select(x => Tuple.Create(x.AccountsCost, x.OwnId)).ToList();
            var actualTuple = actual.Select(x => Tuple.Create(x.AccountsCost, x.OwnId)).ToList();            
            Assert.IsTrue(expectdTuple.SequenceEqual(actualTuple));

            //匿名型別比較，只比較特定property值
            var expectedAnonymousType = expected.Select(x =>
                new
                {
                    AccountsCost = x.AccountsCost
                ,
                    Id = x.OwnId
                });

            var actualAnonymousType = actual.Select(x =>
                new
                {
                    AccountsCost = x.AccountsCost
                ,
                    Id = x.OwnId
                });

            Assert.IsTrue(expectedAnonymousType.SequenceEqual(actualAnonymousType));
        }
    }

    internal class OwnExpenseHPatientDoctorViewModelEqualityComparer : IEqualityComparer<OwnExpenseHPatientDoctorViewModel>
    {
        public bool Equals(OwnExpenseHPatientDoctorViewModel x, OwnExpenseHPatientDoctorViewModel y)
        {
            var result = x.AccountsCost == y.AccountsCost
                && x.DoctorName == y.DoctorName
                && x.OwnId == y.OwnId
                && x.PaidCost == y.PaidCost
                && x.PatientName == y.PatientName
                && x.UnpaidCost == y.UnpaidCost
                && x.UnpBaidCost == y.UnpBaidCost;

            return result;
        }

        public int GetHashCode(OwnExpenseHPatientDoctorViewModel obj)
        {
            //拿來當hash key用的，例如Dictionary<TKey,TValue> 這個Tkey什麼時候叫做Key一樣
            return 0;
        }
    }


    public class OwnExpenseHPatientDoctorViewModel
    {
        public int AccountsCost { get; set; }

        public string DoctorName { get; set; }

        public string OwnId { get; set; }

        public int PaidCost { get; set; }

        public string PatientName { get; set; }

        public int UnpaidCost { get; set; }

        public int UnpBaidCost { get; set; }
    }
}