Entity Framework 的导航属性怎么序列化?我记得以前写的程序是正确的,今天发现出错了,也不知道什么时候开始出错的。一个投票主题的实体类,里面包含了投票选择的实体类集合。原先意图是一次就能返回需要的主从表数据。有些地方要用ajax 加载界面,把实体类序列化的时候报告,重复引用using (Entities db = new Entities())
{
var q = from x in db.TopWinCMS_Vote.Include("VoteChoiceInfo")
where x.ID == id && x.Pass == 1
select x;
return q.FirstOrDefault();
}
[DataContractAttribute]
public partial class VoteInfo
{
public VoteInfo()
{
this.VoteChoiceInfo = new HashSet<VoteChoiceInfo>();
}
[DataMember]
public int ID { get; set; }
[DataMember]
public string Title { get; set; }
[DataMember]
public int Pass { get; set; }
[DataMember]
public System.DateTime CheckInTime { get; set; }
[DataMember]
public int VoteType { get; set; }
[DataMember]
public string PicUrl { get; set; }
[DataMember]
public System.DateTime EndData { get; set; }
[DataMember]
public string windowsize { get; set; }
[DataMember]
public string TemplateFileName { get; set; }
[DataMember]
public int LimitIP { get; set; }
[DataMember]
public ICollection<VoteChoiceInfo> VoteChoiceInfo { get; set; }
} [DataContractAttribute]
public partial class VoteChoiceInfo
{
[DataMember]
public int ID { get; set; }
[DataMember]
public string ChoiceTitle { get; set; }
[DataMember]
public int VoteNum { get; set; }
[DataMember]
public string PicUrl { get; set; }
[DataMember]
public int IsDefault { get; set; }
[DataMember]
public int VoteID { get; set; }
[DataMember]
public int OrderID { get; set; }
[DataMember]
public virtual VoteInfo VoteInfo { get; set; }
}由此可见 VoteInfo 里面包含VoteChoiceInfo ,VoteChoiceInfo 里面包含VoteInfo 。
经断点可以看到,查询出来的实体类是无限递归下去。序列化的时候报
““TopWinCMS.Model.VoteChoiceInfo”类型的对象图包含循环,如果禁用引用跟踪,择无法对其进行序列化。”
{
var q = from x in db.TopWinCMS_Vote.Include("VoteChoiceInfo")
where x.ID == id && x.Pass == 1
select x;
return q.FirstOrDefault();
}
[DataContractAttribute]
public partial class VoteInfo
{
public VoteInfo()
{
this.VoteChoiceInfo = new HashSet<VoteChoiceInfo>();
}
[DataMember]
public int ID { get; set; }
[DataMember]
public string Title { get; set; }
[DataMember]
public int Pass { get; set; }
[DataMember]
public System.DateTime CheckInTime { get; set; }
[DataMember]
public int VoteType { get; set; }
[DataMember]
public string PicUrl { get; set; }
[DataMember]
public System.DateTime EndData { get; set; }
[DataMember]
public string windowsize { get; set; }
[DataMember]
public string TemplateFileName { get; set; }
[DataMember]
public int LimitIP { get; set; }
[DataMember]
public ICollection<VoteChoiceInfo> VoteChoiceInfo { get; set; }
} [DataContractAttribute]
public partial class VoteChoiceInfo
{
[DataMember]
public int ID { get; set; }
[DataMember]
public string ChoiceTitle { get; set; }
[DataMember]
public int VoteNum { get; set; }
[DataMember]
public string PicUrl { get; set; }
[DataMember]
public int IsDefault { get; set; }
[DataMember]
public int VoteID { get; set; }
[DataMember]
public int OrderID { get; set; }
[DataMember]
public virtual VoteInfo VoteInfo { get; set; }
}由此可见 VoteInfo 里面包含VoteChoiceInfo ,VoteChoiceInfo 里面包含VoteInfo 。
经断点可以看到,查询出来的实体类是无限递归下去。序列化的时候报
““TopWinCMS.Model.VoteChoiceInfo”类型的对象图包含循环,如果禁用引用跟踪,择无法对其进行序列化。”
参考http://blogs.msdn.com/b/sowmy/archive/2006/03/26/561188.aspx
DataContractSerializer serializer = new DataContractSerializer(typeof(T), typeof(T).Name, string.Empty, null, int.MaxValue, false, true, null, null);序列化成json还没弄好 DataContractJsonSerializer没类似选项
[DataContract(IsReference = true)]