public override void OnActionExecuting(ActionExecutingContext context) { JsonEntity _json = new JsonEntity(); var modelState = context.ModelState; if (!modelState.IsValid) { var errors = modelState.Where(n => n.Value.Errors.Count > 0).ToList(); string errorMessage = ""; if (errors.Count > 0) { foreach (var error in errors) { errorMessage += error.Value.Errors[0].ErrorMessage + " "; } errorMessage.Remove(errorMessage.Length - 1); _json.AddErrorAlert(((int)HttpStatusCode.BadRequest).ToString(), errorMessage.Replace(".", ",")); } else { _json.AddErrorAlert(HttpStatusCode.BadRequest, BaseApiMessage.ERROR_COMMON_INVALID_PARAMETER); } context.Result = new JsonResult(_json, new JsonSerializerSettings() { ContractResolver = new DefaultJsonContactResolver() { NamingStrategy = new SnakeCaseNamingStrategy() } }); return; } base.OnActionExecuting(context); }