How to return not null filed in wcf json RRS feed


  • Hi,

    WCF uses the DataContractJsonSerializer for serializing objects to JSON. And the DataMember attributes have an EmitDefaultValue property (default is true; see docs here):

    I create the following code and it work well in my computer:
    namespace WcfService3
    [ServiceContract] public interface IService1 { [OperationContract] [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json, UriTemplate = "data/{id}")] Person GetData(string id); } [DataContract] public class Person { [DataMember] public int id { get; set; } [DataMember (EmitDefaultValue=false)] public string FirstName { get; set; } [DataMember] public string LastName { get; set; } } }


     public class Service1 : IService1
            public Person GetData(string id)
                return new Person()
                    id = Convert.ToInt32(id),
                    FirstName = null,

    Then if I put the id="123", then it will return:


    Best Regards.

    Amy Peng
    MSDN Community Support | Feedback to us
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    • Marked as answer by Professo Monday, August 12, 2013 8:05 AM
    Tuesday, August 6, 2013 7:03 AM