EF4 / WCF SaveChanges（）最佳实践
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这就是我们在WCF中为我们的EF实体实现通用Save（）服务的方式。 TT为我们完成了工作。即使我们没有任何问题，我也不愿假定这是最好的方法（即使可能）。你们似乎很聪明，乐于助人，所以我想提出一个问题：
有没有更好的办法？
[OperationContract]
public User SaveUser(User entity)
{
bool _IsDeleted = false;
using (DatabaseEntities _Context = new DatabaseEntities())
{
switch (entity.ChangeTracker.State)
{
case ObjectState.Deleted:
//delete
_IsDeleted = true;
_Context.Users.Attach(entity);
_Context.DeleteObject(entity);
break;
default:
//everything else
_Context.Users.ApplyChanges(entity);
break;
}
// now, to the database
try
{
// try to save changes, which may cause a conflict.
_Context.SaveChanges(System.Data.Objects.SaveOptions.None);
}
catch (System.Data.OptimisticConcurrencyException)
{
// resolve the concurrency conflict by refreshing
_Context.Refresh(System.Data.Objects.RefreshMode.ClientWins, entity);
// Save changes.
_Context.SaveChanges();
}
}
// return
if (_IsDeleted)
return null;
entity.AcceptChanges();
return entity;
}
没有找到相关结果
已邀请:
2 个回复
眠缝
[OperationContract] public User SaveUser(User entity) { bool isDeleted = false; using (DatabaseEntities context = new DatabaseEntities()) { isDeleted = entity.ChangeTracker.State == ObjectState.Deleted; context.Users.ApplyChanges(entity); // It deletes entities marked for deletion as well try { // no need to postpone accepting changes, they will not be accepted if exception happens context.SaveChanges(); } catch (System.Data.OptimisticConcurrencyException) { context.Refresh(System.Data.Objects.RefreshMode.ClientWins, entity); context.SaveChanges(); } } return isDeleted ? null : entity; }琶竞捆栓