EntityReference都有不匹配的EntityKey属性值?
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21-09-2019 - |
题
我试图说明,我创造了一些实体。当我尝试和添加问题的实体来设定(见下面的代码)我收到以下错误:
“对象不能被添加或连接,因为它的EntityReference具有不匹配的EntityKey此对象的的EntityKey属性值。”
我不知道是什么的EntityKey它指的是虽然。下面是代码,有可能是一个更好的方式来退出这个功能,以及:
public Internship CreateInternship(Internship internshipToCreate)
{
try
{
Contact contactToCreate = new Contact();
contactToCreate.Fax = internshipToCreate.contacts.Fax;
contactToCreate.Extension = internshipToCreate.contacts.Extension;
contactToCreate.FirstName = internshipToCreate.contacts.FirstName;
contactToCreate.MiddleName = internshipToCreate.contacts.MiddleName;
contactToCreate.LastName = internshipToCreate.contacts.LastName;
contactToCreate.PhoneNumber = internshipToCreate.contacts.PhoneNumber;
contactToCreate.StreetAddress = internshipToCreate.contacts.StreetAddress;
contactToCreate.PostalCode = internshipToCreate.contacts.PostalCode;
contactToCreate.ContactEmail = internshipToCreate.contacts.ContactEmail;
contactToCreate.statesReference.EntityKey =
new EntityKey("InternshipEntities.StateSet", "ID", internshipToCreate.contacts.states.ID);
contactToCreate.countriesReference.EntityKey =
new EntityKey("InternshipEntities.CountrySet", "ID", internshipToCreate.contacts.countries.ID);
_internshipEntities.AddToContactSet(contactToCreate);
_internshipEntities.SaveChanges();
try
{
Availability availabilityToCreate = new Availability();
availabilityToCreate.StartDate = internshipToCreate.availability.StartDate;
availabilityToCreate.EndDate = internshipToCreate.availability.EndDate;
availabilityToCreate.Negotiable = internshipToCreate.availability.Negotiable;
_internshipEntities.AddToAvailabilitySet(availabilityToCreate);
_internshipEntities.SaveChanges();
try
{
internshipToCreate.contactsReference.EntityKey =
new EntityKey("InternshipEntities.ContactSet", "ID", contactToCreate.ID);
internshipToCreate.availabilityReference.EntityKey =
new EntityKey("InternshipEntities.AvailabilitySet", "ID", availabilityToCreate.ID);
internshipToCreate.classificationsReference.EntityKey =
new EntityKey("InternshipEntities.ClassificationSet", "ID", internshipToCreate.classifications.ID);
internshipToCreate.educationReference.EntityKey =
new EntityKey("InternshipEntities.EducationSet", "ID", internshipToCreate.education.ID);
_internshipEntities.AddToInternshipSet(internshipToCreate); //exception here
_internshipEntities.SaveChanges();
return internshipToCreate;
}
catch(Exception e)
{
throw e;
}
}
catch(Exception e)
{
throw e;
}
}
catch(Exception e)
{
throw e;
}
}
有是除了当我通过,所以我甚至不能确定哪个键是问题跟踪误差给出任何其他信息。
编辑:这里是结束了工作的版本:
using (TransactionScope scope = new TransactionScope())
{
try
{
Contact contactToCreate = new Contact();
Availability availabilityToCreate = new Availability();
Internship i = new Internship();
// Set the contact entity values;
contactToCreate.Fax = internshipToCreate.contacts.Fax;
//...
//ommited for brevity
//...
contactToCreate.ContactEmail = internshipToCreate.contacts.ContactEmail;
// Set the contact entity references to existing tables
contactToCreate.statesReference.EntityKey =
new EntityKey("InternshipEntities.StateSet", "ID", internshipToCreate.contacts.states.ID);
contactToCreate.countriesReference.EntityKey =
new EntityKey("InternshipEntities.CountrySet", "ID", internshipToCreate.contacts.countries.ID);
// Add contact
_internshipEntities.AddToContactSet(contactToCreate);
// Set the availability entity values;
availabilityToCreate.StartDate = internshipToCreate.availability.StartDate;
availabilityToCreate.EndDate = internshipToCreate.availability.EndDate;
availabilityToCreate.Negotiable = internshipToCreate.availability.Negotiable;
// Add availability
_internshipEntities.AddToAvailabilitySet(availabilityToCreate);
//Add contact and availability entities to new internship entity
i.contacts = contactToCreate;
i.availability = availabilityToCreate;
// Set internship entity values;
i.UserID = internshipToCreate.UserID;
//...
//ommited for brevity
//...
i.Created = DateTime.Now;
// Set the internship entity references to existing tables
i.classificationsReference.EntityKey =
new EntityKey("InternshipEntities.ClassificationSet", "ID", internshipToCreate.classifications.ID);
i.educationReference.EntityKey =
new EntityKey("InternshipEntities.EducationSet", "ID", internshipToCreate.education.ID);
// Add internship and save
_internshipEntities.AddToInternshipSet(i);
_internshipEntities.SaveChanges();
//commit transaction
scope.Complete();
return internshipToCreate;
}
catch (Exception e)
{
throw e;
}
}
解决方案
此代码是不是赚了很多道理给我。在两种情况下,你要通过的EntityKey时,你可以只分配一个对象引用。即,改变该:
internshipToCreate.contactsReference.EntityKey =
new EntityKey("InternshipEntities.ContactSet", "ID", contactToCreate.ID);
internshipToCreate.availabilityReference.EntityKey =
new EntityKey("InternshipEntities.AvailabilitySet", "ID", availabilityToCreate.ID);
...为:
internshipToCreate.contacts = contactToCreate;
internshipToCreate.availability = availabilityToCreate;
在其它两种情况下,你似乎尝试分配这已经在那里的对象的ID。这两条线,即使成功,在我看来,什么都不做:
internshipToCreate.classificationsReference.EntityKey =
new EntityKey("InternshipEntities.ClassificationSet", "ID", internshipToCreate.classifications.ID);
internshipToCreate.educationReference.EntityKey =
new EntityKey("InternshipEntities.EducationSet", "ID", internshipToCreate.education.ID);
所以,你可以摆脱他们。
当你做出这两个变化,会发生什么?
其他提示
喂,
虽然我不知道是什么问题,我有一个建议。要传递到方法(internshipToCreate)实习对象用于这些值传送到其它实体(联系,可用性)的 你的方法的内部实例 ,然后其创建工作得很好。
也许你应该尝试做相同的实习?创建新实习对象,并通过从internshipToCreate对象把他们设置你把所有的值,比新创建的对象传递给_internshipEntities.AddToInternshipSet方法。
这可能是你设置你所需要的其他用途internshipToCreate对象的某些价值观,其中有些是实际造成的除外。
和,我不知道你的业务逻辑是什么,但是如果你把所有的一个事务中,因为这样可能会发生创建前两个实体,而第三个不是会更好一些。
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