asp.net mvc自定义MetadataProvider

 

自定义元数据提供程序

  
    

   
     
   
     using
   
      System;

   
     using
   
      System.Collections.Generic;

   
     using
   
      System.Linq;

   
     using
   
      System.Web;

   
     using
   
      System.Web.Mvc;


   
     namespace
   
      ValidationSample
{
 
   
     public
   
      
   
     class
   
      ConventionMetadataProvider : AssociatedMetadataProvider
 {
 
   
     public
   
      ConventionMetadataProvider() : 
   
     base
   
     ()
 {
 }

 
   
     protected
   
      
   
     override
   
      ModelMetadata CreateMetadata(IEnumerable
   
     <
   
     Attribute
   
     >
   
      attributes, Type containerType, Func
   
     <
   
     object
   
     >
   
      modelAccessor, Type modelType, 
   
     string
   
      propertyName)
 {
 var metadata 
   
     =
   
      
   
     new
   
      ModelMetadata(
   
     this
   
     , containerType, modelAccessor, modelType, propertyName);

 
   
     if
   
      (propertyName 
   
     ==
   
      
   
     null
   
     )
 
   
     return
   
      metadata;

 
   
     if
   
      (propertyName.EndsWith(
   
     "
   
     Id
   
     "
   
     ))
 {
 metadata.TemplateHint 
   
     =
   
      
   
     "
   
     HiddenInput
   
     "
   
     ;
 metadata.HideSurroundingChrome 
   
     =
   
      
   
     true
   
     ;
 }
 
 
   
     if
   
      (propertyName.EndsWith(
   
     "
   
     X
   
     "
   
     ))
 {
 metadata.IsRequired 
   
     =
   
      
   
     true
   
     ;
 }

 metadata.DisplayName 
   
     =
   
      propertyName.TrimEnd(
   
     '
   
     X
   
     '
   
     ).Wordify();

 
   
     return
   
      metadata;
 }
 } 

 
   
     public
   
      
   
     static
   
      
   
     class
   
      Extensions
 {
 
   
     public
   
      
   
     static
   
      
   
     string
   
      Wordify(
   
     this
   
      
   
     string
   
      str)
 {
 
   
     string
   
      newString 
   
     =
   
      
   
     ""
   
     ;
 
   
     foreach
   
     (
   
     char
   
      c 
   
     in
   
      str) {
 newString 
   
     +=
   
      
   
     char
   
     .IsUpper(c) 
   
     ?
   
      
   
     "
   
      
   
     "
   
      
   
     +
   
      c : c.ToString();
 }

 
   
     return
   
      newString;
 }
 }

}
  
    

自定义验证提供程序

 

  
    

   
     
   
     using
   
      System;

   
     using
   
      System.Collections.Generic;

   
     using
   
      System.Web.Mvc;


   
     namespace
   
      ValidationSample
{
 
   
     public
   
      
   
     class
   
      ConventionValidatorProvider : AssociatedValidatorProvider
 {
 
   
     protected
   
      
   
     override
   
      IEnumerable
   
     <
   
     ModelValidator
   
     >
   
      GetValidators(ModelMetadata metadata, ControllerContext context,
 IEnumerable
   
     <
   
     Attribute
   
     >
   
      attributes)
 {
 
   
     if
   
      (metadata.IsRequired)
 {
 
   
     yield
   
      
   
     return
   
      
   
     new
   
      MyRequiredValidator(metadata, context);
 }
 }

 
   
     #region
   
      Nested type: MyRequiredValidator
   
     

 
   
     public
   
      
   
     class
   
      MyRequiredValidator : ModelValidator
 {
 
   
     internal
   
      MyRequiredValidator(ModelMetadata metadata, ControllerContext context)
 : 
   
     base
   
     (metadata, context)
 {
 }

 
   
     public
   
      
   
     override
   
      IEnumerable
   
     <
   
     ModelValidationResult
   
     >
   
      Validate(
   
     object
   
      container)
 {
 var result 
   
     =
   
      
   
     new
   
      List
   
     <
   
     ModelValidationResult
   
     >
   
     ();
 
   
     if
   
      (Metadata.Model 
   
     ==
   
      
   
     null
   
     )
 result.Add(
   
     new
   
      ModelValidationResult
 {
 MemberName 
   
     =
   
      Metadata.PropertyName,
 Message 
   
     =
   
      
   
     string
   
     .Format(
   
     "
   
     {0} is required
   
     "
   
     , Metadata.DisplayName)
 });

 
   
     return
   
      result;
 }

 
   
     public
   
      
   
     override
   
      IEnumerable
   
     <
   
     ModelClientValidationRule
   
     >
   
      GetClientValidationRules()
 {
 
   
     yield
   
      
   
     return
   
      
   
     new
   
      ModelClientValidationRequiredRule(
   
     "
   
     This field is required
   
     "
   
     );
 }
 }

 
   
     #endregion
   
     
 } 
}
  
    

 

最后在全局文件中配置

 

  
    

   
     
   
      
   
     protected
   
      
   
     void
   
      Application_Start()
 {
 ModelMetadataProviders.Current 
   
     =
   
      
   
     new
   
      ConventionMetadataProvider();
 ModelValidatorProviders.Current 
   
     =
   
      
   
     new
   
      ConventionValidatorProvider();

 RegisterRoutes(RouteTable.Routes);
 }