-Samples!

Src/Newtonsoft.Json.Tests/Documentation/Samples/Serializer/JsonObjectAttributeOptIn.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Newtonsoft.Json.Tests.Documentation.Samples.Serializer
+{
+  public class JsonObjectAttributeOptIn
+  {
+    #region Types
+    [JsonObject(MemberSerialization.OptIn)]
+    public class File
+    {
+      // excluded from serialization
+      // does not have JsonPropertyAttribute
+      public Guid Id { get; set; }
+
+      [JsonProperty]
+      public string Name { get; set; }
+      [JsonProperty]
+      public int Size { get; set; }
+    }
+    #endregion
+
+    public void Example()
+    {
+      #region Usage
+      File file = new File
+        {
+          Id = Guid.NewGuid(),
+          Name = "ImportantLegalDocuments.docx",
+          Size = 50 * 1024
+        };
+
+      string json = JsonConvert.SerializeObject(file, Formatting.Indented);
+
+      Console.WriteLine(json);
+      // {
+      //   "Name": "ImportantLegalDocuments.docx",
+      //   "Size": 51200
+      // }
+      #endregion
+    }
+  }
+}