change：排序方式，默认按轨迹发生时间降序

src/SJZY.Track.Application.Contract/Dtos/ProvideServices/GetTrackInput.cs

@@ -1,5 +1,3 @@
-using System.ComponentModel.DataAnnotations;
-
 namespace SJZY.Track.Application.Contract.Dtos.ProvideServices;
 
 public class GetTrackInput : OrderNosInfo
@@ -17,10 +15,9 @@ public class GetTrackInput : OrderNosInfo
     }
 
     /// <summary>
-    /// 排序方式
+    /// 排序方式，默认按轨迹发生时间降序
     /// </summary>
-    [Required]
-    public SortMethod SortMethod { get; set; }
+    public SortMethod? SortMethod { get; set; }
 }
 
 public enum SortMethod

src/SJZY.Track.Application/Services/ProvideServices/TrackService.Query.cs

@@ -82,6 +82,7 @@ public partial class TrackService
                 // tips：quick-sort 直接修改原list
                 list.ForEach(item => item.TrackDetails.Sort((a, b) => a.Time.CompareTo(b.Time)));
                 break;
+            case null:
             case SortMethod.ByTrackTimeDesc:
                 list.ForEach(item => item.TrackDetails.Sort((a, b) => b.Time.CompareTo(a.Time)));
                 break;