protected virtual void SaveChanges()
        {
            try
            {
                Db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                throw new DbUpdateConcurrencyException("Lind.DDD框架在更新时引起了乐观并发，后修改的数据不会被保存");
            }
            catch (DbEntityValidationException ex)
            {
                List<string> errorMessages = new List<string>();
                foreach (DbEntityValidationResult validationResult in ex.EntityValidationErrors)
                {
                    string entityName = validationResult.Entry.Entity.GetType().Name;
                    foreach (DbValidationError error in validationResult.ValidationErrors)
                    {
                        errorMessages.Add(entityName + "." + error.PropertyName + ": " + error.ErrorMessage);
                    }
                }
                throw;
            }
            catch (Exception)
            {
                throw;
            }

        }

            try
            {
                InsertData();
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex.Message);
            }