ModelValidator基于元数据的验证

1 private IEnumerable<ModelValidator> GetValidator(Type type)
2 {
3    ModelValidatorProvider provider=new DataAnnodationModelValidatorProvider();
　　　ModelMetaData metadata=ModelMetadataProviders.Current.GetMetadataForType(null,type);
　　　foreach(var validator in provider.GetValidator(metadata,ControllerContext))
     {
　　　　　yeild return validator　
　　　}

　　　foreach(var propertyMetadata in metadata.Properties)
　　　{
　　　　　foreach(var validator in provider.GetValidator(propertyMetadata,ControllerContext))
　　　　　　yeild return validator;
　　　}

4 }

IEnumrable<ModelValidator> GetValidator(ControllerContext context)
{
   return ModelValidatorProviders.Providers.GetValidator(this,context)
}
其中Providers来源：
private static readonly ModelValidatorProviderCollection _providers=new ModelValidatorProviderCollecton
{
　　new DataAnnotationModelValidatorProvider(),
　　new DataErrorInfoModelValidatorProvider(),
　　new ClinetDataTypeModelValidatorProvider()
}

继续实现 Providets的GetValidator的方法：
public class ModelValidatorProviderCollection:ICollection<ModelValidatorProvider>
{
　　public IEnumrable<ModelValidator> GetValidator(ModelMedatata modeltadata,ControllerContext context)
　　{
　　　　return this.CombindItems.SelectMany(ModelValidatorProvider provider)=>provider.GetValidators(modeltadata,context);
　　　　//这个方法CombindItems可理解为内部已定义数据集合和外部自定义的数据集合的合计。具体的实现在MultiServiceResolver：IResolver<IEnumrable<TServerice>>中
　　}
　　//对了这个类我本来不想往下记录下    但是为了以后再学习和本着研究的心态还是硬着头皮写写去吧
　　
　　public IResolver<IEnumrable<ModelValidatorProvider>> _serviceResolver;
　　privite IEnumeable<ModelValidator> CombindItems
　　{
　　　　get{　　
　　　　　　　　return this._serviceResoler.Current;
　　　　　　}
　　}
　　public ModelValidatorProviderCollection()
　　{
　　　　this._serviceResolver=new MultiServiceResolver<ModelValidatorProvider>(()=>this.Items);
　　}
　　public ModelValidatorProviderCollection(IList<ModelValidatorProvider> list):base(list);
　　{
　　　　this._serviceResolver=new MultiServerResolver<ModelValdatorProvider>(()=>this.Items);
　　}
　　internal ModelValidatorProviderCollection(IReslover<IEnumrable<ModelValidatorProvider>> services,Params ModelValidatorProvider[] modelValidatorProviders):base(modelValidatorProviders)
　　{
　　　　IResolver<IEnumrable<ModelValidaotProvider>> arge=services;
　　　　if(arge==null)
　　　　{
　　　　　　arge=new MultiServiceReslover<ModelValidatorProvider>(this.Items);
　　　　}
　　　　this._serviceResolber=arge;
　　}
　　prottect override void SetItem(int index,ModelValidatorProvider item)
　　{
　　　　if(item==null)
　　　　　　throw new ArgumentNullException("item");
　　　　base.SetItem(index,item);
　　}
}

//【下面要介绍的是MultiServiceResolver类的只要实现，主要是通过依赖组件DependencyResolver.Current的GerServices<TService>得到一组数据，然后通过构造函数传入的委托方法得到另外一组数据，通过Current实现两组数据的结合】
public class MultiServiceReslover<TService>:IService<IEnumrable<TService>> where TService :Class
{
　　private Lazy<IEnumerable<TService>> _itemsFormService;
　　private Func<IEnumrable<IService>> _itemThunk;
　　private Func<IEnumrable<TService>> _resolverThunk;
　　public IEnumrable<TService> Current
　　{
　　　　get{
　　　　　　return this.itemsFormService.Value.Cacat(this._itemThunk());
　　　　}
　　}
　　public MultiServiceResolve(Func<IEnumrable<TService>> itemsThunk)
　　{
　　　　if(itemThunk==null)
　　　　　　throw new ArgumentNullException("itemThunk");
　　　　this._itemsThunk=itemsThunk;
　　　　this._resolverThunk=(()=>DependencyResolver.Curremt);
　　　　this._itemsFormServices=new Lazy<IEnumerable<TService>>(()=>this._resolverThunk.GetService<TService>());

　　}
}

public class DataAnnotationModelValidatorProvider:AssocitatedValidatorProvider
{
         //这里只编辑主要的实现方法

      // 这里的DataAnnotationModelValidatorFactory的系统定义的一个委托。如果元数据属性未定义在AttributeFactories中 则采用默认的ModelValidator对象
      internal static DataAnnotationModelValidatorFactory DefaultAttributeFactory=(ModelMetaData metadata,ControllerContext context,ValidatorAttribute attrubute)=>new DataAnnotaionModelValidator(metadata,context,attribute);   
  
 //主要为创建元数据"自我验证"集合,可以通过RegisterValidatableObjectAdapter（Type modelType,Type adapterType）来实现自我注册
   internal static Dictionary<Type,DataAnnotationModelValidatorFactiory>  AttributeFactories=DataAnnotationModelValidatorProvider.BuildAttributeFactoriesDictionary();
            
  //接下来是最主要的代码了  
    protext override IEnumerable<ModelValidator> GetValidators(ModelMetaData metadata,ControllerContext context,ValidatorAttribute attributes)
    {
        var result=new List<ModelValidator>;
         try{
//这一步的意思是： AddImplicitRequiredAttributeForValueTypes （为值类型添加隐式必填验证） 值为True,元数据也声明了Required=True,则必须在attributes里包含 RequiredAttribute  if(DataAnnotatoonModelValidatorProvider.AddImplicitRequiredAttributeForValueType && metadata.IsRequired)
             {
                  if(!attributes.Any((Attribute t)=>t is RequiredAttribute))
                 {
                     attrubutes=attribites.concat(new RequiredAttribute[]{new RequiredAttrbute()});
                 }
             } 
            foreach(var ValidatorAttribute current in attributes.ofType<ValidatorAttribute>)
            {
                 DataAnnotationModelValidatorFactory defaultFactory;
                 if(!DataAnnotationModelValidatorProvider.AttrbuteFactories.TryValue(current.GetType(),out defualtFactory))
                 {
                      defaultFactory=DataAnnotationModelValidatorProvider.DefaultAttrbuteFactoty;
                  }
                  result.Add(defaultFactory(metadata,context,current))
             }
             if(typeof(IValidatableObject).IsAssignableForm(medatat.ModelType))
            {
                 DataAnnotationsValidatableObjectAdapterFactory defaultValidatableFactory;
                    if (!DataAnnotationsModelValidatorProvider.ValidatableFactories.TryGetValue(metadata.ModelType, out defaultValidatableFactory))
                    {
                        defaultValidatableFactory = DataAnnotationsModelValidatorProvider.DefaultValidatableFactory;
                    }
                    result.Add(defaultValidatableFactory(metadata, context));
                    
            }
         }
         finally{

          }
          return result;
    }
    //上面这个方法写了这么多无非就是 根据元数据上的属性获取继承了ModelValidator的对象集合，然后利用集合里每个对象所定义的Validator方法进行验证
    //下面是一些自定义注册方法

    
    public static void RegistAdapter(Type attrbuteType,Type adaperType)
     {
         //获取当前 adaperType的特定构造函数
         ConstructorInfo  constructor=adapterType.GetConstructor(typeOf(ModelMetadata),typeof(ControllerContext),attrbuteType);
        try{
             DataAnnotationModelValidatorProvider.AttributeFacties[attrbuteType]=((ModelMedatada metadata,ControllerContext context,ValidatorAttribute attribute)=>(ModelValidator)constructor.Invoker(new object[]{metadata,context,attrbute}));
         }
         finally{
           }
     }
    
//直接用委托方法注册
     public static void  RegisterAdapterFactory(Type attributeType,DataAnnotationsModelValidatorFactory factory)  BuildAttributeFacoriesDictionary
{
   //还有好多自定义注册方法  反编译后查看吧
   //下面实现的是系统自定义一些ValidatorAttribute
    private static Dictionary<Type,DataAnnotationModelValidatorFactory> dictionary=new Dictionary<Type,DataAnnotationModelValidatorFactory>();
     DataAnnotationsModelValidatorProvider.AddValidationAttributeAdapter(dictionary, typeof(RangeAttribute), (ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute) => new RangeAttributeAdapter(metadata, context, (RangeAttribute)attribute));
            DataAnnotationsModelValidatorProvider.AddValidationAttributeAdapter(dictionary, typeof(RegularExpressionAttribute), (ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute) => new RegularExpressionAttributeAdapter(metadata, context, (RegularExpressionAttribute)attribute));
            DataAnnotationsModelValidatorProvider.AddValidationAttributeAdapter(dictionary, typeof(RequiredAttribute), (ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute) => new RequiredAttributeAdapter(metadata, context, (RequiredAttribute)attribute));
            DataAnnotationsModelValidatorProvider.AddValidationAttributeAdapter(dictionary, typeof(StringLengthAttribute), (ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute) => new StringLengthAttributeAdapter(metadata, context, (StringLengthAttribute)attribute));
            DataAnnotationsModelValidatorProvider.AddValidationAttributeAdapter(dictionary, ValidationAttributeHelpers.MembershipPasswordAttributeType, (ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute) => new MembershipPasswordAttributeAdapter(metadata, context, attribute));
            DataAnnotationsModelValidatorProvider.AddValidationAttributeAdapter(dictionary, ValidationAttributeHelpers.CompareAttributeType, (ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute) => new CompareAttributeAdapter(metadata, context, attribute));
            DataAnnotationsModelValidatorProvider.AddValidationAttributeAdapter(dictionary, ValidationAttributeHelpers.FileExtensionsAttributeType, (ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute) => new FileExtensionsAttributeAdapter(metadata, context, attribute));
            DataAnnotationsModelValidatorProvider.AddDataTypeAttributeAdapter(dictionary, ValidationAttributeHelpers.CreditCardAttributeType, "creditcard");
            DataAnnotationsModelValidatorProvider.AddDataTypeAttributeAdapter(dictionary, ValidationAttributeHelpers.EmailAddressAttributeType, "email");
            DataAnnotationsModelValidatorProvider.AddDataTypeAttributeAdapter(dictionary, ValidationAttributeHelpers.PhoneAttributeType, "phone");
            DataAnnotationsModelValidatorProvider.AddDataTypeAttributeAdapter(dictionary, ValidationAttributeHelpers.UrlAttributeType, "url");
            return dictionary;
 }
}

public sealed override IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata,ControllerContext context)
{
    if(metadata==null)
         throw new ArgumentNullExecption("metadata");
    if(context==null)
         throw new ArgumentNullExecption("context");
    
}   
protect abstract IEnumrable<ModelValidator> GetValidators(ModelMetadata,ControllerContext,IEunmerable<Attribute> atttibutes);//这个抽象方法在上面类（DataAnnotationModelValidatorProvider）里有具体的实现

protected override ICustomTypeDescriptor GetTypeDescriptor(Type type)
{
     return TypeDescriptorHepler.Get(type);
} 

pritvate IEnumerable<ModelValidator> GetValidatorForProperty(ModelMetadata metadata,ControllerContextg context)
{
     IcustomTypeDescriptor typedescriptor=this.GetTypeDescriptor(metadata.ContainerType);
     PropertyDescriptor propertyDescriptor=typedescriptor.GetProperties.Find(metadata.PropertyName,true);
     if(propertyDescriptor==null)
           throw new ArgumentException("PropertyNoFound")；
     return this.GetValidator(metadata,context,propertyDescriptor.Attributes.OfType<Attribute>);  
}

private IEnumerable<ModelValidator> GetValidatorsForType(MedelMetadata metadata,ControllerContext context)
{
     return this.GetValidator(metadata,context,this.GetTypeDescriptor(metadata.ModelType).GetAttributes().Cast<Attribue>);
}

public class DataAnnotationModelValidator:ModelValidator
{
    public override IEnumerable<ModelValidatorResult> Validate(object container)
    {
       ValidationContext validationContext=new ValidationContext(container??base.Metadata.Model,null,null);
       validationContext.DisplayName=this.Metadata.DisPlayName();
　　　　validationResult result=this.Attribute.GetValidationResult(base.Metadata.Model,validationContext);
　　　　if(result!=result.Scuess)
　　　　{
           yeild return New ModelValidateResult
           {
               Message=validation.ErrorMessage;   
       　　 };
           yeild break;
　　   }
    }

     protect internal  string ErrorMessage
     {
         get{
             return this.Attribute.FormatErrorMessage(base.Metadata.DispalyName());
          }
     }
}