Using Validation Annotations
Required必须项验证属性
[Required]public string FirstName { get; set; }[Required]public string LastName { get; set; } StringLength长度
[Required][StringLength(160)]public string LastName { get; set; } [Required][StringLength(160, MinimumLength=3)]public string FirstName { get; set; } RegularExpression正则表达式
[RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}")]public string Email { get; set; } Range数字范围
[Range(35,44)]public int Age { get; set; } [Range(typeof(decimal), "0.00", "49.99")]public decimal Price { get; set; } Validation Attributes from System.Web.Mvc远程验证
[Remote("CheckUserName", "Account")]public string UserName { get; set; } public JsonResult CheckUserName(string username){var result = Membership.FindUsersByName(username).Count == 0;return Json(result, JsonRequestBehavior.AllowGet);} 匹配验证
[RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}")]public string Email { get; set; }[Compare("Email")]public string EmailConfirm { get; set; } Custom Error Messages and Localization自定义错误消息和本地化
[RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}",ErrorMessage="Email doesn't look like a valid email address.")]public string Email { get; set; } [Required(ErrorMessage="Your last name is required")][StringLength(160, ErrorMessage="Your last name is too long")]public string LastName { get; set; } [Required(ErrorMessage="Your {0} is required.")][StringLength(160, ErrorMessage="{0} is too long.")]public string LastName { get; set; } [Required(ErrorMessageResourceType=typeof(ErrorMessages),ErrorMessageResourceName="LastNameRequired")][StringLength(160, ErrorMessageResourceType = typeof(ErrorMessages),ErrorMessageResourceName = "LastNameTooLong")]public string LastName { get; set; } Looking behind the Annotation Curtain
Validation and Model Binding验证模型绑定
[HttpPost]public ActionResult Create(Album album){// the album parameter was created via model binding// ..} [HttpPost]public ActionResult Edit(int id, FormCollection collection){var album = storeDB.Albums.Find(id);if(TryUpdateModel(album)){// ...}} Validation and Model State验证模型状态
ModelState.IsValid == falseModelState.IsValidField("LastName") == falseModelState["LastName"].Errors.Count > 0 验证失败的信息
var lastNameErrorMessage = ModelState["LastName"].Errors[0].ErrorMessage;
VIEW验证
@Html.ValidationMessageFor(m => m.LastName)
Controller Actions and Validation Errors控制器验证错误信息
[HttpPost]public ActionResult AddressAndPayment(Order newOrder){if (ModelState.IsValid){newOrder.Username = User.Identity.Name;newOrder.OrderDate = DateTime.Now;storeDB.Orders.Add(newOrder);storeDB.SaveChanges();// Process the ordervar cart = ShoppingCart.GetCart(this);cart.CreateOrder(newOrder);return RedirectToAction("Complete", new { id = newOrder.OrderId });}// Invalid -- redisplay with errorsreturn View(newOrder);} a啊
[HttpPost]public ActionResult AddressAndPayment(FormCollection collection){var newOrder = new Order();TryUpdateModel(newOrder);if (ModelState.IsValid){newOrder.Username = User.Identity.Name;newOrder.OrderDate = DateTime.Now;storeDB.Orders.Add(newOrder);storeDB.SaveChanges();// Process the ordervar cart = ShoppingCart.GetCart(this);cart.CreateOrder(newOrder);return RedirectToAction("Complete", new { id = newOrder.OrderId });}// Invalid -- redisplay with errorsreturn View(newOrder);} CUSTOM VALIDATION LOGIC自定义验证逻辑
继承ValidationAttribute
using System.ComponentModel.DataAnnotations;namespace MvcMusicStore.Infrastructure{public class MaxWordsAttribute : ValidationAttribute{}} 重写 IsValid
public class MaxWordsAttribute : ValidationAttribute{protected override ValidationResult IsValid(object value, ValidationContext validationContext){return ValidationResult.Success;}} 完整自定义验证代码
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.ComponentModel.DataAnnotations;namespace Mvc4.Infrastructure{ public class MaxWordsAttribute : ValidationAttribute { public MaxWordsAttribute(int maxWords) : base("{0} has too many words.") { _maxWords = maxWords; } protected override ValidationResult IsValid( object value, ValidationContext validationContext) { if (value != null) { var valueAsString = value.ToString(); if (valueAsString.Split(' ').Length > _maxWords) { var errorMessage = FormatErrorMessage(validationContext.DisplayName); return new ValidationResult(errorMessage); } } return ValidationResult.Success; } private readonly int _maxWords; }} Model部分代码
[Required][StringLength(160)][MaxWords(10, ErrorMessage="There are too manywords in { 0}")]public string LastName { get; set; } IValidatableObject模型中自定义验证类
using System;using System.Collections.Generic;using System.ComponentModel.DataAnnotations;using System.Linq;using System.Web;using Mvc4.Infrastructure;namespace Mvc4.Models{ public class Users : IValidatableObject { public IEnumerable Validate(ValidationContext validationContext) { if (LastName != null && LastName.Split(' ').Length > 10) { yield return new ValidationResult("The last name has too many words!", new[] { "LastName" }); } } [Required] [StringLength(160)] public string LastName { get; set; } }} Display
[Required][StringLength(160, MinimumLength=3)][Display(Name="First Name")]public string FirstName { get; set; } 自动生成编辑页面
Order控制字段顺序
[Required][StringLength(160)][Display(Name="Last Name", Order=15001)][MaxWords(10, ErrorMessage="There are too many words in {0}")]public string LastName { get; set; }[Required][StringLength(160, MinimumLength=3)][Display(Name="First Name", Order=15000)]public string FirstName { get; set; } 隐藏属性Scaff oldColumn，使用EditorForModel生效
[ScaffoldColumn(false)]public string Username { get; set; } DisplayFormat格式化已短时间形式显示显示
[DisplayFormat(ApplyFormatInEditMode=true, DataFormatString="{0:d}")]public decimal Time{ get; set; } ReadOnly只读属性，在页面上可以显示但无法将值传入控制器
[ReadOnly(true)]public decimal Total { get; set; } DataType数据类型
[Required][DataType(DataType.Password)][Display(Name="Password")]public string Password { get; set; } HiddenInput隐藏字段