属性' VersionID'是对象的关键信息的一部分,不能修改

时间:2014-10-16 14:59:09

标签: c# asp.net-mvc entity-framework model-view-controller

当我尝试对对象进行复制,重新分配PK ID,然后将对象添加到GeneralInformation模型时,我收到错误消息。

我的实体模型中有两个表:

Version
--------
VersionID (PK)
OwnerID
VersionOwner
VersionNumber

我的第二张桌子:

GeneralInformation
-------------------
GeneralInformationID (Identity)
VersionID (PK)
FirstName
LastName

如何制作我拥有的GeneralInformation对象的COPY?

这是我的控制器:

[HttpGet]
public ActionResult CopyVersion(int? id)
{
     Version version = Db.Versions.Find(id);
     version.isLocked = true;
     Db.Entry(version).State = EntityState.Modified;

     // Add new Version
     var newVersion = new Version() {
         VersionParentID = version.ProformaID,
         OwnerID = version.OwnerID,
         AuthorName = version.AuthorName,
         VersionNumber = (version.VersionNumber + 1)
     };
     Db.Entry(newVersion).State = EntityState.Added;
     Db.SaveChanges();

     // Create a copy of `GeneralInformation` and UPDATE the VersionID
     GeneralInformation generalInformation = new GeneralInformation();

     // Make both VersionID's the same.
     generalInformation.VersionID = newVersion.VersionID;
     version.GeneralInformation.VersionID = newVersion.VersionID;

     var currentValues = Db.Entry<GeneralInformation>(version.GeneralInformation).CurrentValues;
     currentValues.SetValues(generalInformation); //**ERRORS OUT ON THIS LINE**
     generalInformation.VersionID = newVersion.ProformaID;
     Db.GeneralInformations.Add(generalInformation);

     // Redirect to the Proforma Index View
     return RedirectToAction("Index");
}

我收到以下错误:

The property 'VersionID' is part of the object's key information and cannot be modified.

注意: VersionID GeneralInformation是我正在尝试复制的桌子上的PK。

注意: 1 to 0..1的版本与GenralInformation之间存在关联

1 个答案:

答案 0 :(得分:1)

“常规信息”实体的“VersionId”属性应为外键而不是主键。