java对象set时主键丢失,属性'APPLICATIONID'是对象的关键信息的一部分，无法修改...

我有一个问题，我无法通过寻找其他解决方案来解决它们 . 问题是我从用户那里得到了一个应用程序 . 应用程序可以处于不同的状态，我将应用程序本身保存在APPLICATION表中，并在APPLICATIONSTATE表中保存应用程序的状态 . 当用户提交应用程序时，应将默认应用程序状态值写入应用程序状态表 . 在此期间，应用程序的状态将被更改，每次更改都应写入APPLICATIONSTATE表中 .

我正在使用Entity Framework数据库第一种方法，(Oracle EF)，这里是我的数据库E-R图：

以下是Entity Framework生成的部分类：

public partial class APPLICATION

{

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]

public APPLICATION()

{

this.APPLICATIONSTATE = new HashSet();

}

public int APPLICATIONID { get; set; }

public System.DateTime APPLICATIONDATE { get; set; }

public short PROVINCEID { get; set; }

public Nullable ILCEID { get; set; }

public decimal AREA { get; set; }

public bool ISBASEMENTOK { get; set; }

public string APPLICATIONEXPLAINATION { get; set; }

public virtual PERSONEL LOJ_PERSONEL { get; set; }

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]

public virtual ICollection LOJ_APPLICATIONSTATE{ get; set; }

}

public partial class APPLICATIONSTATE

{

public long APPLICATIONSTATEID { get; set; }

public int APPLICATIONENUM { get; set; }

public System.DateTime CURRENTTIME { get; set; }

public virtual APPLICATION LOJ_APPLICATION { get; set; }

public virtual USER LOJ_USER { get; set; }

}

我正在使用Repository模式，这是我尝试添加新应用程序和应用程序状态的代码部分：

int applicationId = int.minvalue;

USER myuser = null;

APPLICATION myApplication = this.gettingFromSomewhere();

using (HousingEntities model = new HousingEntities())

{

applicantuser = model.LOJ_PERSONEL.FirstOrDefault(p => p.PERSONELID == YeniBasvuru.PersonelId);

myApplication.LOJ_USER = applicantuser;

model.APPLICATION.Add(myApplication);

//saving the application

model.SaveChanges();

//getting the primary key of newly created application object from database.

applicationId = this.getMostCurrentIdOfApplication();

myApplication.APPLICATIONID = applicationId;

//getting the user that submits application

applicant = model.USER.FirstOrDefault(p => p.LOJ_USER.USERID == myApplication.LOJ_PERSONEL.USERID);

//if clause-1

if(applicant != null)

{

//saving the state of the application.

appState = new APPLICATIONSTATE();

//3 is the default state for application. When we need to change it to 4, newly row will be added.

appState.APPLICATIONSTATEID = 3;

appState.LOJ_APPLICATION = myApplication;

appState.LOJ_USER = applicant;

//I am getting an error here.

model.APPLICATIONSTATE.Add(appState);

model.SaveChanges();

}

}

result.TransactionResult = true;

result.rowId = applicationId;

}

//other catches removed for clarity.

catch (Exception ex)

{

islemSonuc = new FunctionResult ( ex, this._olasihataciddiyeti);

this.writeError(ex);

}

我在上面指向的行中收到错误属性'APPLICATIONID'是对象的关键信息的一部分，无法修改 . 错误 . 我怎么能克服这个错误？提前致谢 .

我怎样才能克服这个错误？提前致谢 .