EF：重复键上插入

我有follwing代码：EF：重复键上插入

public bool AddLeaveFormApprovers(List<LeaveFormApprovers> listToAdd) 
{ 
    bool returnValue=false; 
    try 
    { 
     using (LeaveRegulationEntities db = new LeaveRegulationEntities(ConnectionStringHelper.GetConnectionString(DaConstants.LeaveRegulationEntities))) 
     { 
      foreach(LeaveFormApprovers approvers in listToAdd) 
      { 
       approvers.AssignedLeave = db.AssignedLeave 
        .FirstOrDefault(a => a.AssignedLeaveID == approvers.AssignedLeave.AssignedLeaveID); 
       approvers.LeaveFormApproverSys = db.LeaveFormApproverSys 
        .FirstOrDefault(a => a.LeaveFormApproverID == approvers.LeaveFormApproverSys.LeaveFormApproverID); 
       db.LeaveFormApprovers.AddObject(approvers); 
      }      
      db.SaveChanges(); 
     } 
     returnValue = true; 
    } 
    catch (Exception ex) 
    { 
     _Exceptions.ManageExceptions(ex); 
    } 
    return returnValue; 
}

的List<LeaveFormApprovers>这份名单是从另一个上下文加载此我得到在当前背景下的对象：

approvers.AssignedLeave = db.AssignedLeave 
    .FirstOrDefault(a => a.AssignedLeaveID == approvers.AssignedLeave.AssignedLeaveID); 
approvers.LeaveFormApproverSys = db.LeaveFormApproverSys 
    .FirstOrDefault(a => a.LeaveFormApproverID == approvers.LeaveFormApproverSys.LeaveFormApproverID);

我收到以下错误：

Violation of PRIMARY KEY constraint 'PK_LeaveFor_B29C651847BE14B9'. Cannot insert duplicate key in object 'dbo.LeaveFormApproverSys'.

来源

2012-05-22 Mazen313

也许你想要[Attach]（http://stackoverflow.com/questions/3920111/entity-framework-4-addobject-vs-attach）批准者对此上下文？然后设置属性？ –

哪些批准者？ – Mazen313

'foreach（LeaveFormApprovers批准者在listToAdd中）' - >这个批准者。 –

在产生listToAdd尝试APPE查询请登录AsNoTracking()。这应该会停止EF跟踪实体并尝试稍后重新插入它。

来源

2012-05-22 08:59:20 Judo

EF：重复键上插入

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