C# EF entity更新异常捕捉

 try
{
......
}
            catch (DbEntityValidationException exc)
            {
                // just to ease debugging
                foreach (var error in exc.EntityValidationErrors)
                {
                    foreach (var errorMsg in error.ValidationErrors)
                    {
                        // logging service based on NLog
                        Console.WriteLine($"errorMsg: {errorMsg.ErrorMessage}; PropertyName = {errorMsg.PropertyName}");
                    }
                }

                throw;
            }
            catch (DbUpdateException e)
            {
                foreach (var result in e.Entries)
                {
                    Console.WriteLine($"Type: {result.Entity.GetType().Name} was part of the problem. ");
                }
                throw;
            }
            catch (Exception e)
            {

                throw;
            }