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()]
public string LastName { get; set; }
[Required]
[StringLength(, MinimumLength=)]
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(,)]
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 == ;
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(, ErrorMessage="Your last name is too long")]
public string LastName { get; set; }
[Required(ErrorMessage="Your {0} is required.")]
[StringLength(, ErrorMessage="{0} is too long.")]
public string LastName { get; set; }
[Required(ErrorMessageResourceType=typeof(ErrorMessages),
ErrorMessageResourceName="LastNameRequired")]
[StringLength(, 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 >
验证失败的信息
var lastNameErrorMessage = ModelState["LastName"].Errors[].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()]
[MaxWords(, ErrorMessage="There are too many
words in {}")]
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 > )
{
yield return new ValidationResult("The last name has too many words!",
new[] { "LastName" });
}
}
[Required]
[StringLength()]
public string LastName { get; set; }
}
}
Display
[Required]
[StringLength(, MinimumLength=)]
[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()]
[Display(Name="Last Name", Order=)]
[MaxWords(, ErrorMessage="There are too many words in {0}")]
public string LastName { get; set; }
[Required]
[StringLength(, MinimumLength=)]
[Display(Name="First Name", Order=)]
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