我有一个EF对象:
public class User
{
[Key, Column("userid", TypeName = "int")]
public Int32 UserId { get; set; }
[Column("username", TypeName = "varchar")]
public String UserName { get; set; }
[Column("password", TypeName = "varchar")]
public String Password { get; set; }
[Column("name", TypeName = "varchar")]
public String Name { get; set; }
[Column("surname", TypeName = "varchar")]
public String Surname { get; set; }
[Column("email", TypeName = "varchar")]
public String Email { get; set; }
[Column("dob", TypeName = "datetime")]
public Nullable<DateTime> Dob { get; set; }
[Column("notes", TypeName = "nvarchar")]
public String Notes { get; set; }
[Column("masterentity", TypeName = "varchar")]
public String MasterEntity { get; set; }
[Column("propertyid", TypeName = "int")]
public Nullable<Int32> PropertyId { get; set; }
[Column("boardmember", TypeName = "bit")]
public Boolean BoardMember { get; set; }
[Column("occupiesunit", TypeName = "bit")]
public Boolean OccupiesUnit { get; set; }
[Column("systemuser", TypeName = "bit")]
public Boolean SystemUser { get; set; }
[Column("isactive", TypeName = "bit")]
public Boolean IsActive { get; set; }
#region Foreing Keys
[ForeignKey("MasterEntity")]
public virtual Entity CurrentMasterEntity { get; set; }
#endregion
}
在客户端,我试图将模型序列化为JSON对象,如下所示:
var jsonUser = @(Html.Raw(Json.Encode(this.Model)));
我得到以下错误:
A circular reference was detected while serializing an object of type ....
我意识到,如果我删除Foreing Keys Fluent API
[ForeignKey("MasterEntity")]
public virtual Entity CurrentMasterEntity { get; set; }
然后它就完美地工作了。因此,与其他实体有关系的实体或对象似乎无法使用JSON进行序列化。
有人有解决这个问题的好方法吗?EF 5.0会解决这个问题吗?
非常感谢。
只要实体之间没有循环引用,就可以序列化具有关系的实体。这意味着,如果A
指向B
,B
指向A
,那就不行了。我怀疑你的CurrentMasterEntity
是否等于实体本身,或者是否可能存在循环图(a对B是主图,B对a是主图),所以你要么有数据错误,要么有双向导航(最常见的形式是Entity Parent
和ICollection<Entity> Children
)。如果这是一个数据错误,只需修复它。如果你有双向导航,你必须选择一个将被序列化的属性,并用[ScriptIgnore]
标记另一个属性,这样它就不会被序列化。
但如果您在客户端并不真正需要CurrentMasterEntity
,只需用前面提到的[ScriptIgnore]
标记即可。