尝试使用EF更新实体并使用WCF发送它 - 属性在更新方案中导致异常
Ore*_*n A 14 c# wcf entity-framework-5
我正在尝试使用WCF发送对象.使用EF从DB检索对象.
这是我得到的例外:
这仅在更新方案中发生.插入效果很好.
跟踪错误,我发现问题出在Travelers我最近添加的一个集合(称为).
以下是在WCF发送更新后的实体之前,在更新之后尝试在运行时观察其值时发生的情况:
这是违规类的属性声明(我尝试取消注释DataMember属性,但它不起作用):
[DataContract]
public class Travel : InsuredObject, ISaleEntity, ICloneable
{
//[DataMember]
public virtual ICollection<Traveler> Travelers { get; set; }
...
我已经读过这个this.Configuration.ProxyCreationEnabled = false;和/或this.Configuration.LazyLoadingEnabled = false;可能会修复它,但我不能因为我以外的原因而改变它们,即使我尝试使用它们 - 我还有其他一些例外......
附加代码:
更新方法:
public virtual TEntity CreateAndUpdate(int saleId, TEntity entity) {
var context = ((IObjectContextAdapter)this.Context).ObjectContext;
var objBaseSet = context.CreateObjectSet<TBase>();
var entityBaseKey = context.CreateEntityKey(objBaseSet.EntitySet.Name, entity);
Object foundBaseEntity;
var baseExists = context.TryGetObjectByKey(entityBaseKey, out foundBaseEntity);
entity.Id = saleId;
if (!baseExists) {
this.GetDbSet<TEntity>().Add(entity);
}
this.objectContext.SaveChanges();
return entity;
}
在更新之前检索包含对象:
public virtual IQueryable<TEntity> GetAll(Expression<Func<TEntity, bool>> where, bool brutalRefresh = false) {
IQueryable<TEntity> retObj = this.GetDbSet<TEntity>();
if (where != null) {
retObj = retObj.Where(where);
}
if (brutalRefresh) {
var context = ((IObjectContextAdapter)this.Context).ObjectContext;
context.Refresh(RefreshMode.StoreWins, retObj);
}
return retObj;
}
...所有代码都是与其他项目共同的代码,发送和接收与我相同的实体,它只是Travel我添加的实体,这导致我的问题,所以我正在寻找的解决方案应该包括0个更改常用代码..
Traveler 级(完全):
[DataContract]
public class Traveler : ISaleEntity, ICloneable
{
[DataMember]
public int Id { get; set; }
[DataMember]
public string FirstName { get; set; }
[DataMember]
public string LastName { get; set; }
[DataMember]
public string IDNumber { get; set; }
[DataMember]
public DateTime? BirthDate { get; set; }
[DataMember]
public virtual ICollection<SelectedCoverage> SelectedCoverages { get; set; }
[NotMapped]
public List<MedicalQuestionnaireAnswer> MedicalQuestionnaireAnswers
{
get
{
if (string.IsNullOrWhiteSpace(DBMedicalQuestionnaireAnswers))
return new List<MedicalQuestionnaireAnswer>();
return DBMedicalQuestionnaireAnswers.Split(',')
.Select(c => (MedicalQuestionnaireAnswer)int.Parse(c)).ToList();
}
set { DBMedicalQuestionnaireAnswers = string.Join(",", value.Select(m => (int)m)); }
}
[NotMapped]
public Genders Gender
{
get { return (Genders)DBGender; }
set { DBGender = (int)value; }
}
/// <summary>
/// NOTE! Do not use this property directly! use MedicalQuestionnaireAnswers instead
/// </summary>
[DataMember]
public string DBMedicalQuestionnaireAnswers { get; set; }
/// <summary>
/// NOTE! Do not use this property directly! use Gender instead
/// </summary>
[DataMember]
public int DBGender { get; set; }
public object Clone()
{
Traveler traveler = new Traveler();
traveler.FirstName = this.FirstName;
traveler.LastName = this.LastName;
traveler.IDNumber = this.IDNumber;
traveler.BirthDate = this.BirthDate;
traveler.DBMedicalQuestionnaireAnswers = this.DBMedicalQuestionnaireAnswers;
traveler.Gender = this.Gender;
if (this.SelectedCoverages != null)
{
traveler.SelectedCoverages = this.SelectedCoverages.Select(sc => (SelectedCoverage)sc.Clone()).ToList();
}
return traveler;
}
}
public static class TravelerExtension
{
/// <summary>
/// copy all the property except from the id and src defualt values
/// </summary>
/// <param name="dbTraveler"></param>
/// <param name="src"></param>
public static void CopyTravelerProperties(this Traveler target, Traveler src)
{
target.FirstName = src.FirstName;
target.LastName = src.LastName;
target.IDNumber = src.IDNumber;
target.BirthDate = src.BirthDate;
target.DBMedicalQuestionnaireAnswers = src.DBMedicalQuestionnaireAnswers;
target.DBGender = src.DBGender;
target.SelectedCoverages.CopySelectedCoveragesProperties(src.SelectedCoverages);
}
}
public static class TravelersExtension
{
/// <summary>
/// copy all the property except from the id and src defualt values
/// </summary>
/// <param name="dbTravelers"></param>
/// <param name="src"></param>
public static void CopyTravelersProperties(this ICollection<Traveler> target, ICollection<Traveler> src)
{
List<int> allTravelersIdsSrc = src.Select(t => t.Id).ToList();
// remove ids exist target and not in src
target.ToList().RemoveAll(t => allTravelersIdsSrc.Contains(t.Id));
target = target ?? new List<Traveler>();
foreach (Traveler srcTraveler in src)
{
var targetTraveler = target.FirstOrDefault(targetTrv => srcTraveler.Id != 0 && targetTrv.Id == srcTraveler.Id);
// if not exist traveler with target traveler id in db
if (targetTraveler == null)
{
// add srcTraveler to target
target.Add(srcTraveler);
}
else
{
targetTraveler.CopyTravelerProperties(srcTraveler);
}
}
}
}
更多信息:
如果ToList()在尝试获取立即窗口中的值之前调用,则不会发生立即窗口异常.问题本身仍然存在.
试图评论该[DataMember]属性:
public virtual ICollection<SelectedCoverage> SelectedCoverages { get; set; }
在Traveler课堂上没有影响.
例外:
更多信息2:
只有一个实体导致异常:
public class Quote : ISaleEntity, ICloneable {
...
[DataMember]
public virtual Travel Travel { get; set; }
...
当我改变以上[DataMember]至[IgnoreDataMember]-也不例外.
我将此类的所有属性设置为 [IgnoreDataMember]
[DataContract]
public class Travel : InsuredObject, ISaleEntity, ICloneable
{
[IgnoreDataMember]
//[DataMember]
public bool? IsFromIsrael { get; set; }
[IgnoreDataMember]
//[DataMember]
public virtual ICollection<Traveler> Travelers { get; set; }
[IgnoreDataMember]
public virtual Quote Quote { get; set; }
[IgnoreDataMember]
//[DataMember]
[NotMapped]
public List<int> DestinationsCodes
{
get
{
if (string.IsNullOrWhiteSpace(DBDestinationsCodes))
return new List<int>();
return DBDestinationsCodes.Split(',').Select(c => int.Parse(c)).ToList();
}
set { DBDestinationsCodes = string.Join(",", value); }
}
/// <summary>
/// NOTE! Do not use this property directly! use DestinationsCodes instead
/// </summary>
[IgnoreDataMember]
//[DataMember]
public string DBDestinationsCodes { get; set; }
...
但例外情况仍然存在.可能是因为该类继承自以下类:
[DataContract]
[KnownType(typeof(Vehicle))]
[KnownType(typeof(Apartment))]
[KnownType(typeof(Travel))]
public class InsuredObject : ISaleEntity, ICloneable {
[Key]
[DataMember]
public int Id { get; set; }
[DataMember]
public int? OwnerTypeId { get; set; }
//navigation property
[DataMember]
public bool? HasShiabud { get; set; }
[DataMember]
[IgnoreDataMember]
public virtual Shiabud Shiabud { get; set; }
//[NotMapped]
//public virtual Proposal Proposal { get; set; }
//[DataMember]
[IgnoreDataMember]
public virtual ICollection<Coverage> Coverages { get; set; }
...
那么如何通过WCF发送此实体？
您能否与 EF 上下文共享执行数据库更新的代码部分？
从错误消息中我了解到，这不是 WCF 在搞鬼。相反，在您应用更改（SaveChanges() 方法）时，EF ObjectContent 似乎已被释放。如果您在 WCF 方法调用之间保持它处于活动状态，例如将其作为后端中的静态变量并将其放在 using 子句中，则可能会发生这种情况。
这应该可以将延迟加载应用于 EF 6 及更高版本的数据库上下文，尽管它对于旧版本的工作原理类似。（我实现了一个继承类来帮助处理配置。这可能不是必需的）
public class DomainDbContext : DbContext
{
Configuration.LazyLoadingEnabled = false;
}