经常看到这个代码

在controller 中写入验证模型，每个需要验证的action 都写….. ，就问你烦不烦~

可以利用 ASP.NET MVC 的 action 拦截机制 自动处理。

1 新建验证模型

添加 using System.ComponentModel.DataAnnotations;  引用

public class Student    {        public int Id { get; set; }        [Required(ErrorMessage="姓名不能为空")]        public string Name { get; set; }        [Range(0,150,ErrorMessage="年龄不合法")]        public int Age { get; set; }    }

 

2  新建一个 action 拦截

ModelValidateAttribute

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 直接返回错误验证结果                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("参数异常:{0}",errorMessage));                }            }            base.OnActionExecuting(filterContext);        }           }

 

全局过滤中注册

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

 

controller 里的 验证就可以去掉了

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();        }    }

 

 

参考bolg：