-Fixed exception message typo

-Fixed serializer sometimes not using DateParseHandling setting
-Fixed error in JsonWriter.WriteToken when writing a DateTimeOffset
-Fixed error when serializing emitted classes that have a constructor with null named parameters (really?)

Src/Newtonsoft.Json.Tests/Properties/AssemblyInfo.cs

@@ -76,5 +76,5 @@ using System.Security;
 // by using the '*' as shown below:
 [assembly: AssemblyVersion("4.5.0.0")]
 #if !PocketPC
-[assembly: AssemblyFileVersion("4.5.9.15324")]
+[assembly: AssemblyFileVersion("4.5.9.15402")]
 #endif

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

@@ -1312,7 +1312,7 @@ keyword such as type of business.""
       String strFromTest = JsonConvert.SerializeObject(testClass);
 
       ExceptionAssert.Throws<JsonSerializationException>(
-        @"Could not create an instance of type Newtonsoft.Json.Tests.TestObjects.ICo. Type is an interface or abstract class and cannot be instantated. Path 'co.Name', line 1, position 14.",
+        @"Could not create an instance of type Newtonsoft.Json.Tests.TestObjects.ICo. Type is an interface or abstract class and cannot be instantiated. Path 'co.Name', line 1, position 14.",
         () =>
         {
           InterfacePropertyTestClass testFromDe = (InterfacePropertyTestClass)JsonConvert.DeserializeObject(strFromTest, typeof(InterfacePropertyTestClass));
@@ -7162,6 +7162,23 @@ Parameter name: value",
 }", json);
     }
 #endif
+
+#if !NET20
+    [Test]
+    public void RoundtripOfDateTimeOffset()
+    {
+      var content = @"{""startDateTime"":""2012-07-19T14:30:00+09:30""}";
+
+      var jsonSerializerSettings = new JsonSerializerSettings() {DateFormatHandling = DateFormatHandling.IsoDateFormat, DateParseHandling = DateParseHandling.DateTimeOffset, DateTimeZoneHandling = DateTimeZoneHandling.RoundtripKind};
+      
+      var obj = (JObject)JsonConvert.DeserializeObject(content, jsonSerializerSettings);
+
+      var dateTimeOffset = (DateTimeOffset)((JValue) obj["startDateTime"]).Value;
+
+      Assert.AreEqual(TimeSpan.FromHours(9.5), dateTimeOffset.Offset);
+      Assert.AreEqual("07/19/2012 14:30:00 +09:30", dateTimeOffset.ToString(CultureInfo.InvariantCulture));
+    }
+#endif
   }
 
 #if !(SILVERLIGHT || NETFX_CORE || PORTABLE)

Src/Newtonsoft.Json/DefaultValueHandling.cs

@@ -47,8 +47,8 @@ namespace Newtonsoft.Json
     /// Ignore members where the member value is the same as the member's default value when serializing objects
     /// so that is is not written to JSON.
     /// This option will ignore all default values (e.g. <c>null</c> for objects and nullable typesl; <c>0</c> for integers,
-    /// decimals and floating point numbers; and <c>false</c> for booleans). The default value ignored can be override by
-    /// the <see cref="DefaultValueAttribute"/>.
+    /// decimals and floating point numbers; and <c>false</c> for booleans). The default value ignored can be changed by
+    /// placing the <see cref="DefaultValueAttribute"/> on the property.
     /// </summary>
     Ignore = 1,
     /// <summary>

Src/Newtonsoft.Json/JsonSerializer.cs

@@ -530,7 +530,7 @@ namespace Newtonsoft.Json
         reader.DateTimeZoneHandling = _dateTimeZoneHandling.Value;
       }
       DateParseHandling? previousDateParseHandling = null;
-      if (_dateParseHandling != null && reader.DateTimeZoneHandling != _dateTimeZoneHandling)
+      if (_dateParseHandling != null && reader.DateParseHandling != _dateParseHandling)
       {
         previousDateParseHandling = reader.DateParseHandling;
         reader.DateParseHandling = _dateParseHandling.Value;

Src/Newtonsoft.Json/JsonWriter.cs

@@ -432,13 +432,22 @@ namespace Newtonsoft.Json
             WritePropertyName(reader.Value.ToString());
             break;
           case JsonToken.Comment:
-            WriteComment(reader.Value.ToString());
+            WriteComment((reader.Value != null) ? reader.Value.ToString() : null);
             break;
           case JsonToken.Integer:
             WriteValue(Convert.ToInt64(reader.Value, CultureInfo.InvariantCulture));
             break;
           case JsonToken.Float:
-            WriteValue(Convert.ToDouble(reader.Value, CultureInfo.InvariantCulture));
+            object value = reader.Value;
+
+            if (value is decimal)
+              WriteValue((decimal)value);
+            else if (value is double)
+              WriteValue((double)value);
+            else if (value is float)
+              WriteValue((float)value);
+            else
+              WriteValue(Convert.ToDouble(value, CultureInfo.InvariantCulture));
             break;
           case JsonToken.String:
             WriteValue(reader.Value.ToString());
@@ -462,10 +471,15 @@ namespace Newtonsoft.Json
             WriteEndConstructor();
             break;
           case JsonToken.Date:
-            WriteValue((DateTime)reader.Value);
+#if !PocketPC && !NET20
+            if (reader.Value is DateTimeOffset)
+              WriteValue((DateTimeOffset)reader.Value);
+            else
+#endif
+              WriteValue(Convert.ToDateTime(reader.Value, CultureInfo.InvariantCulture));
             break;
           case JsonToken.Raw:
-            WriteRawValue((string)reader.Value);
+            WriteRawValue((reader.Value != null) ? reader.Value.ToString() : null);
             break;
           case JsonToken.Bytes:
             WriteValue((byte[])reader.Value);

Src/Newtonsoft.Json/Properties/AssemblyInfo.cs

@@ -90,7 +90,7 @@ using System.Security;
 // by using the '*' as shown below:
 [assembly: AssemblyVersion("4.5.0.0")]
 #if !PocketPC
-[assembly: AssemblyFileVersion("4.5.9.15324")]
+[assembly: AssemblyFileVersion("4.5.9.15402")]
 #endif
 
 [assembly: CLSCompliant(true)]

Src/Newtonsoft.Json/Serialization/DefaultContractResolver.cs

@@ -432,7 +432,10 @@ namespace Newtonsoft.Json.Serialization
 
       foreach (ParameterInfo parameterInfo in constructorParameters)
       {
-        JsonProperty matchingMemberProperty = memberProperties.GetClosestMatchProperty(parameterInfo.Name);
+        // it is possible to generate a ParameterInfo with a null name using Reflection.Emit
+        // protect against an ArgumentNullException from GetClosestMatchProperty by testing for null here
+        JsonProperty matchingMemberProperty = (parameterInfo.Name != null) ? memberProperties.GetClosestMatchProperty(parameterInfo.Name) : null;
+
         // type must match as well as name
         if (matchingMemberProperty != null && matchingMemberProperty.PropertyType != parameterInfo.ParameterType)
           matchingMemberProperty = null;

Src/Newtonsoft.Json/Serialization/JsonSerializerInternalReader.cs

@@ -1165,7 +1165,7 @@ To fix this error either change the environment to be fully trusted, change the
       IDynamicMetaObjectProvider newObject;
 
       if (contract.UnderlyingType.IsInterface() || contract.UnderlyingType.IsAbstract())
-        throw JsonSerializationException.Create(reader, "Could not create an instance of type {0}. Type is an interface or abstract class and cannot be instantated.".FormatWith(CultureInfo.InvariantCulture, contract.UnderlyingType));
+        throw JsonSerializationException.Create(reader, "Could not create an instance of type {0}. Type is an interface or abstract class and cannot be instantiated.".FormatWith(CultureInfo.InvariantCulture, contract.UnderlyingType));
 
       if (contract.DefaultCreator != null &&
         (!contract.DefaultCreatorNonPublic || Serializer.ConstructorHandling == ConstructorHandling.AllowNonPublicDefaultConstructor))
@@ -1446,7 +1446,7 @@ To fix this error either change the environment to be fully trusted, change the
       object newObject = null;
 
       if (objectContract.UnderlyingType.IsInterface() || objectContract.UnderlyingType.IsAbstract())
-        throw JsonSerializationException.Create(reader, "Could not create an instance of type {0}. Type is an interface or abstract class and cannot be instantated.".FormatWith(CultureInfo.InvariantCulture, objectContract.UnderlyingType));
+        throw JsonSerializationException.Create(reader, "Could not create an instance of type {0}. Type is an interface or abstract class and cannot be instantiated.".FormatWith(CultureInfo.InvariantCulture, objectContract.UnderlyingType));
 
       if (objectContract.OverrideConstructor != null)
       {