ASP.NET MVC 自動模型驗證

時間 2019-11-11

標籤 asp.net asp mvc 自動模型驗證欄目 ASP 简体版

原文原文鏈接

常常看到這個代碼css

在controller 中寫入驗證模型，每一個須要驗證的action 都寫….. ，就問你煩不煩~html

能夠利用 ASP.NET MVC 的 action 攔截機制自動處理。ajax

1 新建驗證模型mvc

添加 using System.ComponentModel.DataAnnotations; 引用ide

 public class Student
    {
        public int Id { get; set; }
        [Required(ErrorMessage="姓名不能爲空")]
        public string Name { get; set; }
        [Range(0,150,ErrorMessage="年齡不合法")]
        public int Age { get; set; }
    }

2 新建一個 action 攔截ui

ModelValidateAttributespa

public class ModelValidateAttribute:ActionFilterAttribute
    {

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var viewData = filterContext.Controller.ViewData;
            if (!viewData.ModelState.IsValid)
            {
                var errorMessage = "";
                foreach (var key in viewData.ModelState.Keys)
                {
                    var state = viewData.ModelState[key];
                    if (state.Errors.Any())
                    {
                        errorMessage = state.Errors.First().ErrorMessage;
                        break;
                    }
                }
                // ajax 直接返回錯誤驗證結果
                if (filterContext.RequestContext.HttpContext.Request.IsAjaxRequest())
                {
                    filterContext.Result = new JsonResult
                    {
                        Data = new { success = false, error = errorMessage },
                        JsonRequestBehavior = JsonRequestBehavior.AllowGet
                    };
                }
                else {
                    //filterContext.Result = new ViewResult
                    //{
                    //    ViewData = viewData,
                    //    TempData = filterContext.Controller.TempData
                    //};
                   filterContext.Result = new ContentResult() { Content = errorMessage };

                  //  throw new Exception(string.Format("參數異常:{0}",errorMessage));
                }
            }

            base.OnActionExecuting(filterContext);
        }
       
    }

全局過濾中註冊code

 public class FilterConfig
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new HandleErrorAttribute());
            filters.Add(new JsonRequestBehaviorAttribute());
            filters.Add(new ModelValidateAttribute());
        }
    }

controller 裏的驗證就能夠去掉了orm

 public class StudentController : Controller
    {
        //
        // GET: /Student/
        public ActionResult Index()
        {
           

            return View();
        }

        public JsonResult Create(Student model)
        {
            //if (ModelState.IsValid)
            //{
            //    return Json(new { success = true, message = "成功" });
            //}
            //else {

            //    var error = "";
            //    foreach (var key in ModelState.Keys)
            //    {
            //        var state = ModelState[key];
            //        if (state.Errors.Any())
            //        {
            //            error = state.Errors.First().ErrorMessage;
            //            break;
            //        }        
            //    }

            //    return Json(new { success = false, message = error });
            //}
            return Json(new { success = true, message = "成功" });
        }

        public ActionResult GetStudent(Student model)
        {
            return View();
        }
    }