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    <p>If you're using the <code>DataContractSerializer</code> (or, in this case, the <code>DataContractJsonSerializer</code>), you can use the <code>DataMember(EmitDefaultValue = false)]</code> decoration in your class. This way, you can set the properties which you <em>don't</em> want serialized to their default values (i.e., <code>null</code> for strings, 0 for ints and so on), and they won't be.</p> <p>If you're using the ASP.NET Web API, then you should be aware that the default JSON serializer isn't the <code>DataContractJsonSerializer</code> (DCJS), but JSON.NET instead. So unless you explicitly configure your <code>JsonMediaTypeFormatter</code> to use DCJS, you need another attribute to get the same behavior (<code>JsonProperty</code>, and its <code>DefaultValueHandling</code> property).</p> <p>The code below only serializes the two members which were assigned in this Car object, using both serializers. Notice that you can remove one of the attributes if you're only going to use one of them.</p> <pre><code>public class StackOverflow_12465285 { [DataContract] public class Car { private int savedId; private string savedYear; private string savedMake; private string savedModel; private string savedColor; [DataMember(EmitDefaultValue = false)] [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)] public int Id { get; set; } [DataMember(EmitDefaultValue = false)] [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)] public string Year { get; set; } [DataMember(EmitDefaultValue = false)] [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)] public string Make { get; set; } [DataMember(EmitDefaultValue = false)] [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)] public string Model { get; set; } [DataMember(EmitDefaultValue = false)] [JsonProperty(DefaultValueHandling = DefaultValueHandling.Ignore)] public string Color { get; set; } [OnSerializing] void OnSerializing(StreamingContext ctx) { this.savedId = this.Id; this.savedYear = this.Year; this.savedMake = this.Make; this.savedModel = this.Model; this.savedColor = this.Color; // Logic to determine which ones to serialize, let's say I only want Id, Make; so make all others default. this.Color = default(string); this.Model = default(string); this.Year = default(string); } [OnSerialized] void OnSerialized(StreamingContext ctx) { this.Id = this.savedId; this.Year = this.savedYear; this.Make = this.savedMake; this.Model = this.savedModel; this.Color = this.savedColor; } } public static void Test() { Car car = new Car { Id = 12345, Make = "Ford", Model = "Focus", Color = "Red", Year = "2010" }; JsonSerializer js = new JsonSerializer(); StringBuilder sb = new StringBuilder(); StringWriter sw = new StringWriter(sb); js.Serialize(sw, car); Console.WriteLine("Using JSON.NET: {0}", sb.ToString()); MemoryStream ms = new MemoryStream(); DataContractJsonSerializer dcjs = new DataContractJsonSerializer(typeof(Car)); dcjs.WriteObject(ms, car); Console.WriteLine("Using DCJS: {0}", Encoding.UTF8.GetString(ms.ToArray())); } } </code></pre>
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    1. COThis will not really work for me. I need to be able to hook in at serialization time and exclude properties. I have looked into implementing ISerializable and GetObjectData but I am not yet sure if it is compatible with the Json.net or DataContract serializer. Any other ideas?
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    2. COThere are a few things you can do. One is to simply have a custom `JsonConverter` for your class, and that way you'll control exactly how it's converterd to/from JSON - but it's a lot of work. Another way would be to use the serialization callbacks (supported by both DCJS and JSON.NET) to make the values which you *don't* want to serialize their default values. I've updated the answer with this option as well.
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    3. COThat works, except if I actually want to display a default value. For example, if I have an int property and its real value is 0. I don't want to exclude based on value. I have got a working example using JSON.Net by writing a CustomContractResolver. All I am looking for now is a way to do something similar using DataContract Serialization for the XML version.
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