asp.net-mvc - 为什么 DataContractJsonSerializer 不序列化我的 Id 属性？

Question

我将 LINQ-to-SQL 用于 CRUD 功能，并且 DataContractJsonSerializer将对象序列化为 JSON。我还使用 ASP.NET MVC 的数据绑定(bind)将值发布到执行插入的 MVC 操作。问题是它将序列化除 Id 属性之外的所有属性。我已经将模型设置为:

[Serializable]
[DataContract(Name = "campaign")]
[Table(Name = "hl.campaigns")]
public class Campaign
{
    [DataMember(Name = "id")]
    [Column(Name = "id", AutoSync = AutoSync.OnInsert, IsDbGenerated = true, IsPrimaryKey = true)]
    public Int32 Id { get; set; }

    [DataMember(Name = "createdBy")]
    [Column(Name = "created_by")]
    public Int32 CreatedBy { get; set; }

    [DataMember(Name = "createdOnUtc")]
    [Column(Name = "created_on_utc")]
    public DateTime CreatedOnUtc { get; set; }

    [DataMember(Name = "name")]
    [Column(Name = "name", DbType = "NVarChar(256)")]
    public String Name { get; set; }

    /* more properties here */
}

这是我的自定义 JsonDataContractActionResult :

public class JsonDataContractActionResult : ActionResult
{
    public JsonDataContractActionResult(Object data)
    {
        this.Data = data;
    }

    public Object Data { get; private set; }

    public override void ExecuteResult(ControllerContext context)
    {
        var serializer = new DataContractJsonSerializer(this.Data.GetType());
        String output = String.Empty;
        using (var ms = new MemoryStream())
        {
            serializer.WriteObject(ms, this.Data);
            output = Encoding.Default.GetString(ms.ToArray());
        }
        context.HttpContext.Response.ContentType = "application/json";
        context.HttpContext.Response.Write(output);
    }
}

这是操作(JsonContract() 返回 JsonDataContractActionResult ):

    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Modify([Bind(Prefix = "campaign")] Campaign campaign)
    {
        if (campaign.Id == 0)
        {
            try
            {
                CoreDB.Campaigns.InsertOnSubmit(campaign);
                CoreDB.SubmitChanges();

                return JsonContract(campaign);
            }
            catch(Exception ex)
            {
                // TODO: error handling
            }
         }
         return null; // TODO: modification
     }

我唯一能想到的是，数据绑定(bind)以某种方式阻止了 Id 属性的序列化，因为它是在从表单数据反序列化后填充的。有什么建议么？

Answer 1

这个对象的常规 Json() 方法返回什么？
根据这篇文章... C# 中的自动支持字段可能存在问题:
http://aaron-powell.spaces.live.com/blog/cns!91A824220E2BF369!150.entry