Linq2Sql克隆一個對象C＃

Question

tblAgreement AgreementOld = (from g in TDC.tblAgreements 
          where g.AccountID == ids.accountID && g.AgreementID == AgreementID 
          select g).SingleOrDefault(); 

Guid AgreementIDNew = Guid.NewGuid(); 
var AgreementNew = AgreementOld; 
AgreementNew.AgreementID = AgreementIDNew; 
AgreementNew.StatusChangeDate = DateTime.Now; 
AgreementNew.CreationDate = DateTime.Now; 
AgreementNew.AccountID = ids.accountID; 
AgreementNew.CreatedByID = ids.userID; 
TDC.tblAgreements.InsertOnSubmit(AgreementNew); 

我想創建一個與舊對象具有相同值的新對象，但我收到此錯誤消息;

無法添加已存在的實體。

注意：我不想刪除舊對象。請幫助我我有谷歌它，但找不到任何幫助或解決方案。

Answer 1

您需要創建一個新的對象，目前新對象也reffering到老：

var AgreementNew = new Agreement(); // create a new instance 
AgreementNew.SomeProperty = AgreementOld.SomeProperty; // assign property from old to new 
AgreementNew.AgreementID = AgreementIDNew; // new proerties here 
AgreementNew.StatusChangeDate = DateTime.Now; 
AgreementNew.CreationDate = DateTime.Now; 
AgreementNew.AccountID = ids.accountID; 
AgreementNew.CreatedByID = ids.userID; 
TDC.tblAgreements.InsertOnSubmit(AgreementNew); 

Answer 2

如果AgreementOld是數據表，然後就去做

var AgreementNew = AgreementOld.Copy();