捕获EF提交异常

            try
            {

            }
            catch (DbEntityValidationException dbex)
            {
                string errMsg = string.Empty;

                foreach (var eve in dbex.EntityValidationErrors)
                {
                    errMsg += string.Format("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
                        eve.Entry.Entity.GetType().Name, eve.Entry.State);
                    foreach (var ve in eve.ValidationErrors)
                    {
                        errMsg += string.Format("- Property: \"{0}\", Error: \"{1}\"",
                            ve.PropertyName, ve.ErrorMessage);
                    }
                }
                return new OperationResult(OperationResultType.Error, errMsg);
            }
            catch (Exception ex)
            {
                return new OperationResult(OperationResultType.Error, ex.ToString());
            }