MVC 两种自定义验证方法

1.使用MVC缺省的DataAnnotationsModelValidatorProvider,这样我们只需要自己定义一个从ValidationAttribute继承的类,并实现其IsValid(object value)方法的逻辑即可实现服务器端验证,要实现其客户端验证,需要定义一个从DataAnnotationsModelValidator<CustomAttribute>继承的验证类,其需实现其GetClientValidationRules方法,并在Application_Start()中使用DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(ConfirmValidatorAttribute), typeof(ConfirmValidator)); 注册,最后再加上客户端代码即可.

例:

[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
 public class CustomAttribute : ValidationAttribute {

        public override bool IsValid(object value)
        {
            var val = value as string;
            if (string.IsNullOrEmpty(val))
            {
                return false;
            }
            return val.Equals("Hello,world!", StringComparison.OrdinalIgnoreCase);
        }

}

 

public class CustomValidator : DataAnnotationsModelValidator<CustomAttribute> {

  public CustomValidator(ModelMetadata metadata, ControllerContext context, CustomAttribute attribute)
   : base(metadata, context, attribute) {
  }

  public override IEnumerable<ModelClientValidationRule> GetClientValidationRules() {
   return new[] {
    new ModelClientValidationRule {
     ErrorMessage = "输入: Hello,world!",
     ValidationType = "custom"
    }
   };
  }

        public override IEnumerable<ModelValidationResult> Validate(object container)
        {
            return base.Validate(container);
        }
 }

 

protected void Application_Start()
{

DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(ConfirmValidatorAttribute), typeof(ConfirmValidator));

}

2.使用自己定义的验证提供器,首先定义一个特性类(继承于Attribute),然后再定义一个验证类(继承于ModelValidator)并重写Validate方法实现验证逻辑,再创建用于产生提供者类继承于AssociatedValidatorProvider并实现GetValidators方法,最后在Application_Start()中使用ModelValidatorProviders.Providers.Add(new ConfirmValidatorProvider())注册即可实现自定义的服务器端验证,要实现客户端验证,需要在验证类中重写GetClientValidationRules方法再加上客户端代码即可.

来自:http://www.cnblogs.com/xfrog/archive/2011/01/25/1944867.html

下例将实现一个ConfirmValidator，用于验证用户注册时两次密码必须输入一致：

1、创建一个空MVC项目

2、添加用户信息模型UserInfo.cs

显示行号 复制代码 ？ UserInfo

1. public class UserInfo
   

2.  {
   

3.     public string UserName { get; set; }
   

4.     public string Password { get; set; }
   

5.     public string ConfirmPassword { get; set; }
   

6.     public string Email { get; set; }
   

7. }
   

3、创建一个特性，用于指定与属性关联的另一个属性的名称

显示行号 复制代码 ？ ConfirmValidatorAttribute

1. public class ConfirmValidatorAttribute : Attribute
   

2.  {
   

3.     public String ConfirmPropertyName { get; set; }
   

5.     public ConfirmValidatorAttribute(string name)
   

6.     {
   

7.         ConfirmPropertyName = name;
   

8.     }
   

9. }
   

4、创建用于实现验证逻辑的ConfirmValidator类

显示行号 复制代码 ？ ConfirmValidator

1. public class ConfirmValidator : ModelValidator
   

2.  {
   

3.     private string  confirmPropertyName;
   

4.     public ConfirmValidator(ModelMetadata metaData, ControllerContext context, string confirmProperty)
   

5.         : base(metaData, context)
   

6.     {
   

7.         confirmPropertyName = confirmProperty;
   

8.     }
   

10.     public override IEnumerable<ModelValidationResult> Validate(object container)
    

11.     {
    

12.         if (container == null)
    

13.             yield break;
    

14.         PropertyInfo pi = container.GetType().GetProperty(confirmPropertyName);
    

15.         if (pi != null)
    

16.         {
    

17.             string confirmValue = (string)pi.GetValue(container, null);
    

18.             if ( !(Metadata.Model??String.Empty).Equals(confirmValue??String.Empty))
    

19.             {
    

20.                 yield return new ModelValidationResult()
    

21.                 {
    

22.                     Message = "两次输入不一致!"
    

23.                 };
    

24.             }
    

25.         }
    

26.         else
    

27.         {
    

28.             throw new InvalidOperationException("属性" + confirmPropertyName + "不存在");
    

29.         }
    

30.     }
    

31. }
    

5、创建用于产生ConfirmValidator的提供者类：ConfirmValidatorProvider

显示行号 复制代码 ？ ConfirmValidatorProvider

1. public class ConfirmValidatorProvider : AssociatedValidatorProvider
   

2.  {
   

3.     protected override IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata, ControllerContext context, IEnumerable<Attribute> attributes)
   

4.     {
   

5.         foreach (ConfirmValidatorAttribute attr in attributes.OfType<ConfirmValidatorAttribute>())
   

6.         {
   

7.             yield return new ConfirmValidator(metadata, context, attr.ConfirmPropertyName);
   

8.         }
   

9.     }
   

10. }
    

6、创建用于测试的控制器及视图

显示行号 复制代码 ？ HomeController

1. public class HomeController : Controller
   

2. {
   

3.     public ActionResult Index()
   

4.     {
   

5.         return View(new UserInfo());
   

6.     }
   

7.     [HttpPost]
   

8.     public ActionResult Index(UserInfo ui)
   

9.     {
   

10.         return View(ui);
    

11.     }
    

12. }
    

<body>

    <div>

    <%using(Html.BeginForm()){ %>

        <%= Html.ValidationSummary(true) %>

        <%= Html.EditorFor(x=>x) %>

        <input type="submit" value="提交" />

    <%} %>

    </div>

</body>

7、修改UserInfo.cs,在ConfirmPassword属性上添加ConfirmValidator特性。

[ConfirmValidator("Password")]

public string ConfirmPassword { get; set; }

8、在Global Application_Start中添加ConfirmValidatorProvider

ModelValidatorProviders.Providers.Add(new ConfirmValidatorProvider());

    实现客户端验证：

1、修改ConfirmValidator类，添加GetClientValidationRules方法。

public override IEnumerable<ModelClientValidationRule> GetClientValidationRules()

{

    ModelClientValidationRule rule = new ModelClientValidationRule()

    {

        ErrorMessage = "两次输入不一致!",

        ValidationType = "ConfirmValidator"

    };

    rule.ValidationParameters["ConfirmPropertyName"] = confirmPropertyName;

    yield return rule;

}

2、修改Index.aspx，添加对Ajax脚本的引用

<script type="text/javascript" src="http://www.cnblogs.com/Scripts/MicrosoftAjax.js"></script>

<script type="text/javascript" src="http://www.cnblogs.com/Scripts/MicrosoftMvcValidation.js"></script>

3、添加自定义验证脚本

<script type="text/javascript">

    Sys.Mvc.ValidatorRegistry.validators.ConfirmValidator = function (rule) {

        var propertyName = rule.ValidationParameters.ConfirmPropertyName;

        return function (value, context) {

            var confirmValue = document.getElementsByName(propertyName)[0].value;

            return (value == confirmValue);

        }

    };

</script>

4、开启客户端验证功能

<%Html.EnableClientValidation(); %>

5、将ConfirmPassword属性加入客户端验证

<% Html.ValidateFor(x => x.ConfirmPassword); %>

修改后完整视图代码：

<body>

    <div>

    <%Html.EnableClientValidation(); %>

    <%using(Html.BeginForm()){ %>

        <%= Html.ValidationSummary(true) %>

        <% Html.ValidateFor(x => x.ConfirmPassword); %>

        <%= Html.EditorFor(x=>x) %>

        <input type="submit" value="提交" />

    <%} %>

    </div>

    <script type="text/javascript" src="http://www.cnblogs.com/Scripts/MicrosoftAjax.js"></script>

    <script type="text/javascript" src="http://www.cnblogs.com/Scripts/MicrosoftMvcValidation.js"></script>

    <script type="text/javascript">

        Sys.Mvc.ValidatorRegistry.validators.ConfirmValidator = function (rule) {

            var propertyName = rule.ValidationParameters.ConfirmPropertyName;

            return function (value, context) {

                var confirmValue = document.getElementsByName(propertyName)[0].value;

                return (value == confirmValue);

            }

        };

    </script>

</body>