Fixed the serialization problem

Author: buraksenyurt

Chapter06/Chapter06.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AutoMapper" Version="13.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>
 
   <ItemGroup>

Chapter06/Persistence/JsonPersistence.cs

@@ -1,10 +1,10 @@
 using Azon.Web.Sdk.Components;
 using Azon.Web.Sdk.Contracts;
-using System.Text.Json;
+using Newtonsoft.Json;
 
 namespace Chapter06.Persistence;
 
-public class JsonPersistence 
+public class JsonPersistence
     : IFilePersistence
 {
     public string FilePath { get; set; } = Path.Combine(Environment.CurrentDirectory, "Form.json");
@@ -13,10 +13,9 @@ public void Save(List<Control> controls)
     {
         var dtos = controls.Select(ControlMapper.ToDto).ToList();
 
-        var json = JsonSerializer.Serialize(dtos, options: new JsonSerializerOptions
+        var json = JsonConvert.SerializeObject(dtos, Formatting.Indented, new JsonSerializerSettings
         {
-            WriteIndented = true,
-            IncludeFields = true
+            TypeNameHandling = TypeNameHandling.All
         });
 
         File.WriteAllText(FilePath, json);