实体框架-当引用完整性停止删除记录时，将实体标记为非活动

Question

I writing a simple method which should delete an entity from the database if possible, else it should mark the record as inactive if there is an integrity rule stopping the record from being deleted.

The code I have is:

    public ActionResult Delete(int id)
    {
        try
        {
            Service.Repository<TEntity>().Delete(id);
            Service.SaveChanges(this.CurrentUser);
            return this.RedirectToActionPermanent("Index");
        }
        catch (DbUpdateException)
        {
            Service.Repository<TEntity>().D

            // Could not delete due to referential integrity so mark as inactive
            var obj = Service.Repository<TEntity>().Find(id);
            obj.Inactive = true;

            // Error thrown here as obj is already marked as deleted
            Service.SaveChanges(this.CurrentUser);

            return this.RedirectToActionPermanent("Index");
        }
    }

The issue I have is that after when I run the code within the DbUpdateException and then execute save, another exception is thrown as the entity is still marked as 'deleted'. What is the best way of removing the original delete action from entity so I can try the save again?

• Edit I meant to say that I have seen lots of people stating that I should dispose of the existing context and get a new one. To me this seems a little wrong in this context as I am injecting the context upon each Http request via Unity.

Thanks

Answer 1

You can refresh the entity from database then modify it again. You have to add a method to you repository in your case.

context.Refresh(RefreshMode.StoreWins, object);