fix 调试问题

Src/Dlhis.Middle/Request/OrderAddRequest.cs

@@ -1,8 +1,9 @@
-using Dlhis.Entity.Canteen.Enums;
+using System.ComponentModel.DataAnnotations;
+using Dlhis.Entity.Canteen.Enums;
 
 namespace Dlhis.Middle.Request;
 
-public class OrderAddRequest
+public class OrderAddRequest : IValidatableObject
 {
     /// <summary>
     /// 是否离线数据
@@ -37,4 +38,15 @@ public class OrderAddRequest
     public DateTime? CostDateTime { get; set; }
 
     public string Image { get; set; }
+
+    /// <inheritdoc />
+    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
+    {
+        if (!CostDateTime.HasValue)
+        {
+            CostDateTime = DateTime.Now;
+        }
+        
+        yield break;
+    }
 }