[C#][ASP.NET MVC]Validation

2010-02-21

6891
0
C#
2010-02-23

網頁開發中驗證client端所提交的資料是否符合規定算很普遍的功能，自己紀錄一下。

簡單驗證(Server-Side)

Validation Methods

#region Validation Methods

        public bool ValidateNull(String type,String input)
        {
            String error = String.Empty;
            switch (type)
            {
                case "BookName":
                    error = "書籍名稱必填";
                    break;
                case "UserName":
                    error = "作者性名必填";
                    break;
            }
            if (String.IsNullOrEmpty(input))
            {
                ModelState.AddModelError(input, error);
            }
            return ModelState.IsValid;
        }

        public bool ValidateLength(String type, String input)
        {
            String error = String.Empty;
            switch (type)
            {
                case "UserName":
                    error = "作者性名長度不能超過10個單字";
                    break;
            }
            if (input.Length>10)
            {
                ModelState.AddModelError(input, error);
            }
            return ModelState.IsValid;
        }

#endregion

Create in Controller

 [AcceptVerbs(HttpVerbs.Post)]

        public ActionResult Create(FormCollection collection)

            if (!ValidateNull("BookName", collection["BookName"]))

                return View();

            if (!ValidateNull("UserName", collection["UserName"]))

                return View();

try

                // TODO: Add insert logic here

                return RedirectToAction("Index");

            catch

                return View();

結果

另一種方法，使用Data Annotation Validators。

先加入Microsoft.Web.Mvc.DataAnnotations.dll和System.ComponentModel.DataAnnotations.dll並引用


using System.ComponentModel.DataAnnotations;

Register the DataAnnotations Model Binder in the Global.asax

protected void Application_Start()

            RegisterRoutes(RouteTable.Routes);

            ModelBinders.Binders.DefaultBinder = 
             new Microsoft.Web.Mvc.DataAnnotations.DataAnnotationsModelBinder();

Add Models

namespace MVCcrud.Models

    public partial class BookRepository

        [Required(ErrorMessage = "書籍名稱必填")]

        public string BookName { get; set; }

        [Required(ErrorMessage = "作者性名必填")]

        [StringLength(10,ErrorMessage = "長度不能超過10個單字")]

        public string UserName { get; set; }

        public string Website { get; set; }

        [Required(ErrorMessage = "Email必填")]

        [RegularExpression("^([0-9a-zA-Z]+[-._+&amp;])*[0-9a-zA-Z]+@
         ([-0-9a-zA-Z]+[.])+[a-zA-Z]{2,6}$", ErrorMessage = "請輸入正確Email")]

       
        public string Email { get; set; }

這時Create只要寫成這樣


 public ActionResult Create(BookRepository bookrepository)
        {
            //if (!ValidateNull("BookName", collection["BookName"]))
            //{
            //    return View();
            //}
            //else if (!ValidateNull("UserName", collection["UserName"]))
            //{
            //    return View();
            //}
            //else if (!ValidateLength("UserName", collection["UserName"]))
            //{
            //    return View();
            //}
            if (!ModelState.IsValid)
                return View();
        
            try
            {
                // TODO: Add insert logic here               
                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }