TimeSpan to/from ISO8601

GridBlazorOData.Server/Models/NorthwindDbContext.cs

@@ -1,5 +1,6 @@
 using GridBlazorOData.Shared.Models;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 
 namespace GridBlazorOData.Server.Models
 {
@@ -13,6 +14,9 @@ public NorthwindDbContext(DbContextOptions<NorthwindDbContext> options)
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
+            modelBuilder.Entity<Order>()
+                .Property(s => s.Age)
+                .HasConversion(new TimeSpanToTicksConverter());
             modelBuilder.Entity<OrderDetail>()
                 .HasKey(c => new { c.OrderID, c.ProductID });
 

GridBlazorOData.Shared/Models/Order.cs

@@ -82,6 +82,9 @@ public Order()
         [NotMappedColumn]
         [ForeignKey("ShipVia")]
         public virtual Shipper Shipper { get; set; }
+
+        [GridColumn(Position = 18)]
+        public TimeSpan? Age { get; set; }
     }
 
 }

GridShared/Utility/JsonSerializerOptionsExtensions.cs

@@ -23,6 +23,7 @@ public static JsonSerializerOptions AddOdataSupport(this JsonSerializerOptions j
                 }
             // required for Blazor WA
             jsonOptions.Converters.Add(new ODataDateTimeConverter());
+            jsonOptions.Converters.Add(new ODataTimeSpanConverter());
 
             converters = jsonOptions.Converters.Where(r => r.CanConvert(typeof(Enum)));
             if (converters != null)

GridShared/Utility/ODataTimeSpanConverter.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Diagnostics;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Xml;
+
+namespace GridShared.Utility
+{
+    /// <summary>
+    /// Converts with TimeSpan to/from ISO8601
+    /// </summary>
+    public class ODataTimeSpanConverter : JsonConverter<TimeSpan>
+    {
+        public override TimeSpan Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            Debug.Assert(typeToConvert == typeof(TimeSpan));
+            return XmlConvert.ToTimeSpan(reader.GetString());
+        }
+
+        public override void Write(Utf8JsonWriter writer, TimeSpan value, JsonSerializerOptions options)
+        {
+            writer.WriteStringValue(XmlConvert.ToString(value));
+        }
+    }
+}