在函数中，我传递一个相关值列表并循环它们以保存数据库中的更改。一切正常，直到2个或更多人使用相同的页面来更新不同的实体。然后只保存那些最近更改的数据。
public bool UpdatePermanentDifferenceBL(List<PermanentDifferenceProperties> permDiffDetails)
{
try
{
int permanentDifferenceID=0;
int taxEntityID = 0;
int mapid = 0;
//using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
//{
Topaz.DAL.PermanentDifference permDiff;
for (int i = 0; i < permDiffDetails.Count; i++)
{
if ((bool)(HttpContext.Current.Session[GlobalConstant.currentDataSet]) == true && (int)(HttpContext.Current.Session[GlobalConstant.snapShotID]) == 0)
{
using (var ctx = new TopazDbContainer())
{
try
{
permanentDifferenceID = permDiffDetails[i].PermanentDifferenceID;
taxEntityID = permDiffDetails[i].TaxEntityID;
mapid = permDiffDetails[i].MapID;
permDiff = new Topaz.DAL.PermanentDifference();
permDiff = ctx.PermanentDifference.Where(p => p.PermanentDifferenceID == permanentDifferenceID && p.TaxEntityID == taxEntityID && p.MapID == mapid).SingleOrDefault();
permDiff.Business = permDiffDetails[i].Business;
permDiff.Interest = permDiffDetails[i].Interest;
permDiff.Corporate = permDiffDetails[i].Corporate;
permDiff.UnallocatedTax = permDiffDetails[i].UnallocatedTax;
permDiff.Total = permDiffDetails[i].Total;
permDiff.ModifiedBy = permDiffDetails[i].ModifiedBy;
permDiff.ModifiedDate = DateTime.Now;
ctx.SaveChanges();
}
catch (System.Data.OptimisticConcurrencyException ex)
{
permanentDifferenceID = permDiffDetails[i].PermanentDifferenceID;
taxEntityID = permDiffDetails[i].TaxEntityID;
mapid = permDiffDetails[i].MapID;
permDiff = new Topaz.DAL.PermanentDifference();
ctx.Refresh(System.Data.Objects.RefreshMode.StoreWins, permDiff);
permDiff = ctx.PermanentDifference.Where(p => p.PermanentDifferenceID == permanentDifferenceID && p.TaxEntityID == taxEntityID && p.MapID == mapid).SingleOrDefault();
permDiff.Business = permDiffDetails[i].Business;
permDiff.Interest = permDiffDetails[i].Interest;
permDiff.Corporate = permDiffDetails[i].Corporate;
permDiff.UnallocatedTax = permDiffDetails[i].UnallocatedTax;
permDiff.Total = permDiffDetails[i].Total;
permDiff.ModifiedBy = permDiffDetails[i].ModifiedBy;
permDiff.ModifiedDate = DateTime.Now;
ctx.SaveChanges();
}
}
}
//ctx.ContextOptions.UseLegacyPreserveChangesBehavior = true;
}
//}
//using (UnitOfWork uow = new UnitOfWork())
//{
// for (int i = 0; i < permDiffDetails.Count; i++)
// {
// if ((bool)(HttpContext.Current.Session[GlobalConstant.currentDataSet]) == true && (int)(HttpContext.Current.Session[GlobalConstant.snapShotID]) == 0)
// {
// Repository.PermanentDifferenceRepository pDiffRepo = new Repository.PermanentDifferenceRepository(uow);
// Topaz.DAL.PermanentDifference permDiff = pDiffRepo.GetByEntityId(permDiffDetails[i].PermanentDifferenceID, permDiffDetails[i].TaxEntityID, permDiffDetails[i].MapID);
// permDiff.Business = permDiffDetails[i].Business;
// permDiff.Interest = permDiffDetails[i].Interest;
// permDiff.Corporate = permDiffDetails[i].Corporate;
// permDiff.UnallocatedTax = permDiffDetails[i].UnallocatedTax;
// permDiff.Total = permDiffDetails[i].Total;
// permDiff.ModifiedBy = permDiffDetails[i].ModifiedBy;
// permDiff.ModifiedDate = DateTime.Now;
// pDiffRepo.ApplyChanges(permDiff);
// }
// else
// {
// int snapshotID = (int)(HttpContext.Current.Session[GlobalConstant.snapShotID]);
// SnapShotPermanentDifferenceRepository pDiffRepo = new SnapShotPermanentDifferenceRepository(uow);
// SnapShotPermanentDifference permDiff = pDiffRepo.GetByEntityId(permDiffDetails[i].PermanentDifferenceID, permDiffDetails[i].TaxEntityID, permDiffDetails[i].MapID,snapshotID);
// permDiff.SnapshotID = snapshotID;
// permDiff.Business = permDiffDetails[i].Business;
// permDiff.Interest = permDiffDetails[i].Interest;
// permDiff.Corporate = permDiffDetails[i].Corporate;
// permDiff.UnallocatedTax = permDiffDetails[i].UnallocatedTax;
// permDiff.Total = permDiffDetails[i].Total;
// permDiff.ModifiedBy = permDiffDetails[i].ModifiedBy;
// permDiff.ModifiedDate = DateTime.Now;
// pDiffRepo.ApplyChanges(permDiff);
// }
// }
// uow.SaveChanges();
return true;
}
catch (Exception ex)
{
TopazErrorLogs.AddTopazErrorLogBL(ex, 1, 1);
throw new TopazCustomException(GlobalConstant.errorMessage);
}
}
非常感谢任何紧急援助。
答案 0 :(得分：0)
解决此问题的常用方法是在要处理并发的每个表中添加其他列。此列将包含ROWVERSION或TIMESTAMP数据类型。在EDMX中映射表后，您将获得类型为byte[]的新计算属性，并将其并发模式设置为固定。此设置将强制EF为每个UPDATE或DELETE语句添加额外的WHERE条件，以验证行版本与从数据库加载记录时的行版本相同。如果行版本不相同（另一个线程更新了记录），则找不到修改记录，您将获得异常。
每次自动更新记录时，数据库都会更改值。您只需确保您的实体使用从数据库加载实体时检索到的值。
答案 1 :(得分：0)
道歉所有观点状态，并且在某种程度上会话是罪魁祸首而不是EntityFramework。