MVC4数据注释与验证

Using Validation Annotations

using System.ComponentModel.DataAnnotations;//命名空间

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