-Added SerializeCompilerGeneratedMembers to DefaultContractResolver to control serializing compiler generated fields

Src/Newtonsoft.Json.Tests/Serialization/ContractResolverTests.cs

@@ -4,6 +4,8 @@ using System.Linq;
 using System.Text;
 using NUnit.Framework;
 using Newtonsoft.Json.Serialization;
+using Newtonsoft.Json.Tests.TestObjects;
+using System.Reflection;
 
 namespace Newtonsoft.Json.Tests.Serialization
 {
@@ -79,5 +81,50 @@ namespace Newtonsoft.Json.Tests.Serialization
   ""BookPrice"": 16.19
 }", startingWithB);
     }
+
+    [Test]
+    public void SerializeCompilerGeneratedMembers()
+    {
+      StructTest structTest = new StructTest
+        {
+          IntField = 1,
+          IntProperty = 2,
+          StringField = "Field",
+          StringProperty = "Property"
+        };
+
+      DefaultContractResolver skipCompilerGeneratedResolver = new DefaultContractResolver
+      {
+        DefaultMembersSearchFlags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public
+      };
+
+      string skipCompilerGeneratedJson = JsonConvert.SerializeObject(structTest, Formatting.Indented,
+        new JsonSerializerSettings { ContractResolver = skipCompilerGeneratedResolver });
+
+      Assert.AreEqual(@"{
+  ""StringField"": ""Field"",
+  ""IntField"": 1,
+  ""StringProperty"": ""Property"",
+  ""IntProperty"": 2
+}", skipCompilerGeneratedJson);
+
+      DefaultContractResolver includeCompilerGeneratedResolver = new DefaultContractResolver
+      {
+        DefaultMembersSearchFlags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
+        SerializeCompilerGeneratedMembers = true
+      };
+
+      string includeCompilerGeneratedJson = JsonConvert.SerializeObject(structTest, Formatting.Indented,
+        new JsonSerializerSettings { ContractResolver = includeCompilerGeneratedResolver });
+
+      Assert.AreEqual(@"{
+  ""StringField"": ""Field"",
+  ""IntField"": 1,
+  ""<StringProperty>k__BackingField"": ""Property"",
+  ""<IntProperty>k__BackingField"": 2,
+  ""StringProperty"": ""Property"",
+  ""IntProperty"": 2
+}", includeCompilerGeneratedJson);
+    }
   }
 }

Src/Newtonsoft.Json/Serialization/DefaultContractResolver.cs

@@ -35,6 +35,7 @@ using System.Security.Permissions;
 using Newtonsoft.Json.Converters;
 using Newtonsoft.Json.Utilities;
 using Newtonsoft.Json.Linq;
+using System.Runtime.CompilerServices;
 
 namespace Newtonsoft.Json.Serialization
 {
@@ -113,6 +114,14 @@ namespace Newtonsoft.Json.Serialization
     /// <value>The default members search flags.</value>
     public BindingFlags DefaultMembersSearchFlags { get; set; }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether compiler generated members should be serialized.
+    /// </summary>
+    /// <value>
+    /// 	<c>true</c> if serialized compiler generated members; otherwise, <c>false</c>.
+    /// </value>
+    public bool SerializeCompilerGeneratedMembers { get; set; }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="DefaultContractResolver"/> class.
     /// </summary>
@@ -205,20 +214,24 @@ namespace Newtonsoft.Json.Serialization
       List<MemberInfo> serializableMembers = new List<MemberInfo>();
       foreach (MemberInfo member in allMembers)
       {
-        if (defaultMembers.Contains(member))
+        // exclude members that are compiler generated if set
+        if (SerializeCompilerGeneratedMembers || !member.IsDefined(typeof(CompilerGeneratedAttribute), true))
         {
-          // add all members that are found by default member search
-          serializableMembers.Add(member);
-        }
-        else
-        {
-          // add members that are explicitly marked with JsonProperty/DataMember attribute
-          if (JsonTypeReflector.GetAttribute<JsonPropertyAttribute>(member) != null)
+          if (defaultMembers.Contains(member))
+          {
+            // add all members that are found by default member search
             serializableMembers.Add(member);
+          }
+          else
+          {
+            // add members that are explicitly marked with JsonProperty/DataMember attribute
+            if (JsonTypeReflector.GetAttribute<JsonPropertyAttribute>(member) != null)
+              serializableMembers.Add(member);
 #if !PocketPC && !NET20
-          else if (dataContractAttribute != null && JsonTypeReflector.GetAttribute<DataMemberAttribute>(member) != null)
-            serializableMembers.Add(member);
+            else if (dataContractAttribute != null && JsonTypeReflector.GetAttribute<DataMemberAttribute>(member) != null)
+              serializableMembers.Add(member);
 #endif
+          }
         }
       }