MVC4数据注释与验证
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 == false ModelState.IsValidField("LastName") == false ModelState["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 order var cart = ShoppingCart.GetCart(this); cart.CreateOrder(newOrder); return RedirectToAction("Complete", new { id = newOrder.OrderId }); } // Invalid -- redisplay with errors return 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 order var cart = ShoppingCart.GetCart(this); cart.CreateOrder(newOrder); return RedirectToAction("Complete", new { id = newOrder.OrderId }); } // Invalid -- redisplay with errors return 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 many words 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<ValidationResult> 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
<fieldset>
<legend>Shipping Information</legend>
@Html.EditorForModel()
</fieldset>
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
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