C# LINQ如何去Distinct物件List透過物件某個屬性
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApp2 { public class WIP_StationStatusModel { public string Id { get; set; } public string Wo { get; set; } public string Line { get; set; } public string Station { get; set; } public string Status { get; set; } public DateTime TranslationTime { get; set; } public string Ip { get; set; } public string JigNo { get; set; } public string Creator { get; set; } public DateTime? CreateDate { get; set; } } class Program { static void Main(string[] args) { List<WIP_StationStatusModel> StationStatusDatas = new List<WIP_StationStatusModel>(); for (int idx = 0; idx < 8; idx++) { WIP_StationStatusModel wIP_StationStatusModel = new WIP_StationStatusModel(); if (new List<int>() { 1, 5, 6 }.Contains(idx)) { wIP_StationStatusModel.Id = "1"; } else if (new List<int>() { 2, 7 }.Contains(idx)) { wIP_StationStatusModel.Id = "2"; } else { wIP_StationStatusModel.Id = "3"; } wIP_StationStatusModel.Wo = string.Format("WO_{0}", idx); wIP_StationStatusModel.Line = string.Format("LINE_{0}", idx); wIP_StationStatusModel.Station = string.Format("Station_{0}", idx); if (idx % 2 == 1 || idx == 4) { wIP_StationStatusModel.Status = "START"; } else { wIP_StationStatusModel.Status = "END"; } if (idx == 7 || idx == 8) { wIP_StationStatusModel.Wo = "BB"; } else { wIP_StationStatusModel.Wo = "AA"; } double mins = 30 * idx; DateTime dt = DateTime.Now.AddMinutes(mins); wIP_StationStatusModel.TranslationTime = dt; wIP_StationStatusModel.Ip = ""; StationStatusDatas.Add(wIP_StationStatusModel); } Console.WriteLine("Method1."); List<WIP_StationStatusModel> distincStationList = StationStatusDatas.GroupBy(x => x.Id).Select(y => y.First()).ToList(); foreach (WIP_StationStatusModel obj in distincStationList) { Console.WriteLine($"{ string.Format("{0}-{1}", obj.Station, obj.Line) } id: {obj.Id}"); } Console.WriteLine("Method2."); var distincStationList2 = StationStatusDatas.Distinct(new StationComparer()); foreach(WIP_StationStatusModel obj in distincStationList2) { Console.WriteLine($"{ string.Format("{0}-{1}",obj.Station,obj.Line) } id: {obj.Id}"); } Console.ReadKey(); } } public class StationComparer : IEqualityComparer<WIP_StationStatusModel> { public bool Equals(WIP_StationStatusModel obj1, WIP_StationStatusModel obj2) { return obj1?.Id == obj2?.Id; } public int GetHashCode(WIP_StationStatusModel obj) { return obj.Id.GetHashCode(); } } } |
Ref:
https://makolyte.com/csharp-select-distinct-objects-based-on-a-property/
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