-Added additional ToString overloads to JValue

-Fixed poor error message when dynamic type cannot be created during deserialization
-Fixed error when setting a null value on a dynamic type during deserialization
-Fixed JsonTextReader.ReadAsDecimal not attempting to convert string values to decimal

Src/Newtonsoft.Json.Tests/Linq/DynamicTests.cs

@@ -185,7 +185,7 @@ namespace Newtonsoft.Json.Tests.Linq
 
       Assert.AreEqual("", d.Null.ToString());
       Assert.AreEqual("1", d.Integer.ToString());
-      Assert.AreEqual("1.1", d.Float.ToString());
+      Assert.AreEqual("1.1", d.Float.ToString(CultureInfo.InvariantCulture));
       Assert.AreEqual("12/29/2000 23:51:10", d.DateTime.ToString(null, CultureInfo.InvariantCulture));
       Assert.AreEqual("True", d.Boolean.ToString());
       Assert.AreEqual("A string lol!", d.String.ToString());

Src/Newtonsoft.Json.Tests/Linq/LinqToJsonTest.cs

@@ -25,6 +25,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Text;
 using NUnit.Framework;
@@ -285,7 +286,7 @@ keyword such as type of business.""
   1264118400000
 )", o.Property("Establised").Value.ToString());
       Assert.AreEqual(@"""Width"": 1.1", o.Property("Width").ToString());
-      Assert.AreEqual(@"1.1", o.Property("Width").Value.ToString());
+      Assert.AreEqual(@"1.1", ((JValue)o.Property("Width").Value).ToString(CultureInfo.InvariantCulture));
       Assert.AreEqual(@"""Open"": false", o.Property("Open").ToString());
       Assert.AreEqual(@"False", o.Property("Open").Value.ToString());
 

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

@@ -182,6 +182,103 @@ namespace Newtonsoft.Json.Tests.Serialization
       Assert.AreEqual("Child text!", n.DynamicChildObject.Text);
       Assert.AreEqual(int.MinValue, n.DynamicChildObject.Integer);
     }
+
+    [Test]
+    [ExpectedException(typeof(JsonSerializationException), ExpectedMessage = "Unable to find a default constructor to use for type System.Dynamic.DynamicObject.")]
+    public void NoPublicDefaultConstructor()
+    {
+      var settings = new JsonSerializerSettings();
+      settings.NullValueHandling = NullValueHandling.Ignore;
+      var json = @"{
+  ""contributors"": null
+}";
+      
+      JsonConvert.DeserializeObject<DynamicObject>(json, settings);
+    }
+
+    public class DictionaryDynamicObject : DynamicObject
+    {
+      public IDictionary<string, object> Values { get; private set; }
+
+      protected DictionaryDynamicObject()
+      {
+        Values = new Dictionary<string, object>();
+      }
+
+      public override bool TrySetMember(SetMemberBinder binder, object value)
+      {
+        Values[binder.Name] = value;
+        return true;
+      }
+    }
+
+    [Test]
+    public void AllowNonPublicDefaultConstructor()
+    {
+      var settings = new JsonSerializerSettings();
+      settings.ConstructorHandling = ConstructorHandling.AllowNonPublicDefaultConstructor;
+
+      var json = @"{
+  ""contributors"": null,
+  ""retweeted"": false,
+  ""text"": ""Guys SX4 diesel is launched.what are your plans?catch us at #facebook http://bit.ly/dV3H1a #auto #car #maruti #india #delhi"",
+  ""in_reply_to_user_id_str"": null,
+  ""retweet_count"": 0,
+  ""geo"": null,
+  ""id_str"": ""40678260320768000"",
+  ""in_reply_to_status_id"": null,
+  ""source"": ""<a href=\""http://www.tweetdeck.com\"" rel=\""nofollow\"">TweetDeck</a>"",
+  ""created_at"": ""Thu Feb 24 07:43:47 +0000 2011"",
+  ""place"": null,
+  ""coordinates"": null,
+  ""truncated"": false,
+  ""favorited"": false,
+  ""user"": {
+    ""profile_background_image_url"": ""http://a1.twimg.com/profile_background_images/206944715/twitter_bg.jpg"",
+    ""url"": ""http://bit.ly/dcFwWC"",
+    ""screen_name"": ""marutisuzukisx4"",
+    ""verified"": false,
+    ""friends_count"": 45,
+    ""description"": ""This is the Official Maruti Suzuki SX4 Twitter ID! Men are Back - mail us on social (at) sx4bymaruti (dot) com"",
+    ""follow_request_sent"": null,
+    ""time_zone"": ""Chennai"",
+    ""profile_text_color"": ""333333"",
+    ""location"": ""India"",
+    ""notifications"": null,
+    ""profile_sidebar_fill_color"": ""efefef"",
+    ""id_str"": ""196143889"",
+    ""contributors_enabled"": false,
+    ""lang"": ""en"",
+    ""profile_background_tile"": false,
+    ""created_at"": ""Tue Sep 28 12:55:15 +0000 2010"",
+    ""followers_count"": 117,
+    ""show_all_inline_media"": true,
+    ""listed_count"": 1,
+    ""geo_enabled"": true,
+    ""profile_link_color"": ""009999"",
+    ""profile_sidebar_border_color"": ""eeeeee"",
+    ""protected"": false,
+    ""name"": ""Maruti Suzuki SX4"",
+    ""statuses_count"": 637,
+    ""following"": null,
+    ""profile_use_background_image"": true,
+    ""profile_image_url"": ""http://a3.twimg.com/profile_images/1170694644/Slide1_normal.JPG"",
+    ""id"": 196143889,
+    ""is_translator"": false,
+    ""utc_offset"": 19800,
+    ""favourites_count"": 0,
+    ""profile_background_color"": ""131516""
+  },
+  ""in_reply_to_screen_name"": null,
+  ""id"": 40678260320768000,
+  ""in_reply_to_status_id_str"": null,
+  ""in_reply_to_user_id"": null
+}";
+
+      DictionaryDynamicObject foo = JsonConvert.DeserializeObject<DictionaryDynamicObject>(json, settings);
+
+      Assert.AreEqual(false, foo.Values["retweeted"]);
+    }
   }
 }
 #endif

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

@@ -28,6 +28,7 @@ using System.Collections.Generic;
 #if !SILVERLIGHT && !PocketPC && !NET20
 using System.ComponentModel.DataAnnotations;
 using System.Runtime.CompilerServices;
+using System.Threading;
 using System.Web.Script.Serialization;
 #endif
 using System.Text;
@@ -4178,5 +4179,29 @@ keyword such as type of business.""
   ""Name"": null
 }", json);
     }
+
+    public class DeserializeStringConvert
+    {
+      public string Name { get; set; }
+      public int Age { get; set; }
+      public double Height { get; set; }
+      public decimal Price { get; set; }
+    }
+
+    [Test]
+    public void DeserializeStringEnglish()
+    {
+      string json = @"{
+  'Name': 'James Hughes',
+  'Age': '40',
+  'Height': '44.4',
+  'Price': '4'
+}";
+
+      DeserializeStringConvert p = JsonConvert.DeserializeObject<DeserializeStringConvert>(json);
+      Assert.AreEqual(40, p.Age);
+      Assert.AreEqual(44.4, p.Height);
+      Assert.AreEqual(4d, p.Price);
+    }
   }
 }

Src/Newtonsoft.Json/JsonTextReader.cs

@@ -348,6 +348,13 @@ namespace Newtonsoft.Json
       if (TokenType == JsonToken.Float)
         return (decimal?)Value;
 
+      decimal d;
+      if (TokenType == JsonToken.String && decimal.TryParse((string)Value, NumberStyles.Number, CultureInfo.InvariantCulture, out d))
+      {
+        SetToken(JsonToken.Float, d);
+        return d;
+      }
+
       throw CreateJsonReaderException("Unexpected token when reading decimal: {0}. Line {1}, position {2}.", TokenType, _currentLineNumber, _currentLinePosition);
     }
 

Src/Newtonsoft.Json/Linq/JValue.cs

@@ -458,6 +458,30 @@ namespace Newtonsoft.Json.Linq
       return _value.ToString();
     }
 
+    /// <summary>
+    /// Returns a <see cref="System.String"/> that represents this instance.
+    /// </summary>
+    /// <param name="format">The format.</param>
+    /// <returns>
+    /// A <see cref="System.String"/> that represents this instance.
+    /// </returns>
+    public string ToString(string format)
+    {
+      return ToString(format, CultureInfo.CurrentCulture);
+    }
+
+    /// <summary>
+    /// Returns a <see cref="System.String"/> that represents this instance.
+    /// </summary>
+    /// <param name="formatProvider">The format provider.</param>
+    /// <returns>
+    /// A <see cref="System.String"/> that represents this instance.
+    /// </returns>
+    public string ToString(IFormatProvider formatProvider)
+    {
+      return ToString(null, formatProvider);
+    }
+
     /// <summary>
     /// Returns a <see cref="System.String"/> that represents this instance.
     /// </summary>

Src/Newtonsoft.Json/Serialization/JsonSerializerInternalReader.cs

@@ -228,7 +228,7 @@ namespace Newtonsoft.Json.Serialization
           case JsonToken.Boolean:
           case JsonToken.Date:
           case JsonToken.Bytes:
-            return EnsureType(reader.Value, objectType);
+            return EnsureType(reader.Value, CultureInfo.InvariantCulture, objectType);
           case JsonToken.String:
             // convert empty string to null automatically for nullable types
             if (string.IsNullOrEmpty((string)reader.Value) &&
@@ -240,7 +240,7 @@ namespace Newtonsoft.Json.Serialization
             if (objectType == typeof(byte[]))
               return Convert.FromBase64String((string)reader.Value);
 
-            return EnsureType(reader.Value, objectType);
+            return EnsureType(reader.Value, CultureInfo.InvariantCulture, objectType);
           case JsonToken.StartConstructor:
           case JsonToken.EndConstructor:
             string constructorName = reader.Value.ToString();
@@ -251,7 +251,7 @@ namespace Newtonsoft.Json.Serialization
             if (objectType == typeof (DBNull))
               return DBNull.Value;
 
-            return EnsureType(reader.Value, objectType);
+            return EnsureType(reader.Value, CultureInfo.InvariantCulture, objectType);
           case JsonToken.Raw:
             return new JRaw((string)reader.Value);
           case JsonToken.Comment:
@@ -463,7 +463,7 @@ namespace Newtonsoft.Json.Serialization
         );
     }
 
-    private object EnsureType(object value, Type targetType)
+    private object EnsureType(object value, CultureInfo culture, Type targetType)
     {
       if (targetType == null)
         return value;
@@ -476,7 +476,7 @@ namespace Newtonsoft.Json.Serialization
       {
         try
         {
-          return ConvertUtils.ConvertOrCast(value, CultureInfo.InvariantCulture, targetType);
+          return ConvertUtils.ConvertOrCast(value, culture, targetType);
         }
         catch (Exception ex)
         {
@@ -612,7 +612,7 @@ namespace Newtonsoft.Json.Serialization
             object keyValue;
             try
             {
-              keyValue = EnsureType(reader.Value, contract.DictionaryKeyType);
+              keyValue = EnsureType(reader.Value, CultureInfo.InvariantCulture, contract.DictionaryKeyType);
             }
             catch (Exception ex)
             {
@@ -776,9 +776,9 @@ namespace Newtonsoft.Json.Serialization
 
       if (contract.DefaultCreator != null &&
         (!contract.DefaultCreatorNonPublic || Serializer.ConstructorHandling == ConstructorHandling.AllowNonPublicDefaultConstructor))
-      {
         newObject = (IDynamicMetaObjectProvider)contract.DefaultCreator();
-      }
+      else
+        throw new JsonSerializationException("Unable to find a default constructor to use for type {0}.".FormatWith(CultureInfo.InvariantCulture, contract.UnderlyingType));
 
       if (id != null)
         Serializer.ReferenceResolver.AddReference(id, newObject);

Src/Newtonsoft.Json/Utilities/DynamicUtils.cs

@@ -98,6 +98,8 @@ namespace Newtonsoft.Json.Utilities
 
     public static bool TryGetMember(this IDynamicMetaObjectProvider dynamicProvider, string name, out object value)
     {
+      ValidationUtils.ArgumentNotNull(dynamicProvider, "dynamicProvider");
+
       GetMemberBinder getMemberBinder = (GetMemberBinder) BinderWrapper.GetMember(name, typeof (DynamicUtils));
 
       CallSite<Func<CallSite, object, object>> callSite = CallSite<Func<CallSite, object, object>>.Create(new NoThrowGetBinderMember(getMemberBinder));
@@ -118,7 +120,9 @@ namespace Newtonsoft.Json.Utilities
 
     public static bool TrySetMember(this IDynamicMetaObjectProvider dynamicProvider, string name, object value)
     {
-      SetMemberBinder binder = (SetMemberBinder) BinderWrapper.SetMember(name, value.GetType());
+      ValidationUtils.ArgumentNotNull(dynamicProvider, "dynamicProvider");
+
+      SetMemberBinder binder = (SetMemberBinder)BinderWrapper.SetMember(name, typeof(DynamicUtils));
 
       var setterSite = CallSite<Func<CallSite, object, object, object>>.Create(new NoThrowSetBinderMember(binder));