Use System.Text.Json (xamarin#711)

Author: davidbritch

WebServices/TodoREST/Droid/TodoREST.Android.csproj

@@ -58,6 +58,9 @@
       <Version>1.6.1</Version>
     </PackageReference>
     <PackageReference Include="Xamarin.Forms" Version="5.0.0.1874" />
+    <PackageReference Include="System.Text.Json">
+      <Version>5.0.1</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup>
     <Reference Include="System" />

WebServices/TodoREST/TodoREST/Data/RestService.cs

@@ -4,20 +4,25 @@
 using System.Net.Http;
 using System.Text;
 using System.Threading.Tasks;
-using Newtonsoft.Json;
-using Xamarin.Forms;
+using System.Text.Json;
 
 namespace TodoREST
 {
     public class RestService : IRestService
     {
         HttpClient client;
+        JsonSerializerOptions serializerOptions;
 
         public List<TodoItem> Items { get; private set; }
 
         public RestService()
         {
             client = new HttpClient();
+            serializerOptions = new JsonSerializerOptions
+            {
+                PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+                WriteIndented = true
+            };
         }
 
         public async Task<List<TodoItem>> RefreshDataAsync()
@@ -31,7 +36,7 @@ public async Task<List<TodoItem>> RefreshDataAsync()
                 if (response.IsSuccessStatusCode)
                 {
                     string content = await response.Content.ReadAsStringAsync();
-                    Items = JsonConvert.DeserializeObject<List<TodoItem>>(content);
+                    Items = JsonSerializer.Deserialize<List<TodoItem>>(content, serializerOptions);
                 }
             }
             catch (Exception ex)
@@ -48,7 +53,7 @@ public async Task SaveTodoItemAsync(TodoItem item, bool isNewItem = false)
 
             try
             {
-                string json = JsonConvert.SerializeObject(item);
+                string json = JsonSerializer.Serialize<TodoItem>(item, serializerOptions);
                 StringContent content = new StringContent(json, Encoding.UTF8, "application/json");
 
                 HttpResponseMessage response = null;

WebServices/TodoREST/TodoREST/Models/TodoItem.cs

@@ -1,15 +1,10 @@
-using System;
-
-namespace TodoREST
+namespace TodoREST
 {
 	public class TodoItem
 	{
 		public string ID { get; set; }
-
 		public string Name { get; set; }
-
 		public string Notes { get; set; }
-
 		public bool Done { get; set; }
 	}
 }

WebServices/TodoREST/TodoREST/TodoREST.csproj

@@ -9,9 +9,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
     <PackageReference Include="Xamarin.Forms" Version="5.0.0.1874" />
+    <PackageReference Include="System.Text.Json" Version="5.0.1" />
   </ItemGroup>
 
   <ItemGroup>

WebServices/TodoREST/iOS/TodoREST.iOS.csproj

@@ -76,6 +76,9 @@
       <Version>1.6.1</Version>
     </PackageReference>
     <PackageReference Include="Xamarin.Forms" Version="5.0.0.1874" />
+    <PackageReference Include="System.Text.Json">
+      <Version>5.0.1</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup>
     <Reference Include="System" />