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copied!<p>IMHO the best thing would be to change the <code>Foo</code> type from <a href="http://msdn.microsoft.com/en-us/library/system.int32.aspx" rel="nofollow noreferrer"><code>Int32</code></a> to <a href="http://msdn.microsoft.com/en-us/library/b3h38hb0.aspx" rel="nofollow noreferrer"><code>System.Nullable<Int32></code></a> as this would best reflect its semantics (if it can be null) but if you cannot modify this class AND if using <a href="http://msdn.microsoft.com/en-us/library/system.runtime.serialization.json.datacontractjsonserializer.aspx" rel="nofollow noreferrer">DataContractJsonSerializer</a> is not an obligation for you, <a href="http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx" rel="nofollow noreferrer">Json.NET</a> has extension points that allow you to do this (it also happens to be <a href="http://james.newtonking.com/archive/2010/01/01/net-serialization-performance-comparison.aspx" rel="nofollow noreferrer">better performing</a>).</p> <p>For example you could write a custom type converter:</p> <pre><code>internal class NullableIntConverter : JsonConverter { public override bool CanConvert(Type objectType) { return objectType == typeof(int); } public override object ReadJson(JsonReader reader, Type objectType, JsonSerializer serializer) { if (reader.Value == null) { return default(int); } return int.Parse(reader.Value.ToString()); } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { throw new System.NotImplementedException(); } } </code></pre> <p>that could be registered and used like this:</p> <pre><code>internal class Program { private static void Main(string[] args) { var serializer = new JsonSerializer(); serializer.Converters.Add(new NullableIntConverter()); using (var reader = new StringReader(@"{""Foo"":null}")) using (var jsonReader = new JsonTextReader(reader)) { var pony = serializer.Deserialize<Pony>(jsonReader); Console.WriteLine(pony.Foo); } } } </code></pre>

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