AssociatedMetadataProvider Class

Artigo
02/21/2011

Provides an abstract class to implement a metadata provider.

Inheritance Hierarchy

System.Object
  System.Web.Mvc.ModelMetadataProvider
    System.Web.Mvc.AssociatedMetadataProvider
      System.Web.Mvc.DataAnnotationsModelMetadataProvider
      System.Web.Mvc.EmptyModelMetadataProvider

Namespace: System.Web.Mvc
Assembly: System.Web.Mvc (in System.Web.Mvc.dll)

Syntax

'Declaration
Public MustInherit Class AssociatedMetadataProvider _
    Inherits ModelMetadataProvider

public abstract class AssociatedMetadataProvider : ModelMetadataProvider

public ref class AssociatedMetadataProvider abstract : public ModelMetadataProvider

The AssociatedMetadataProvider type exposes the following members.

Constructors

	Name	Description
	AssociatedMetadataProvider	Called from constructors in a derived class to initialize the AssociatedMetadataProvider class.

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Methods

	Name	Description
	CreateMetadata	When overridden in a derived class, creates the model metadata for the property.
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	FilterAttributes	Gets a list of attributes.
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetMetadataForProperties	Returns a list of properties for the model. (Overrides ModelMetadataProvider.GetMetadataForProperties(Object, Type).)
	GetMetadataForProperty(Func<Object>, Type, PropertyDescriptor)	Returns the metadata for the specified property using the container type and property descriptor.
	GetMetadataForProperty(Func<Object>, Type, String)	Returns the metadata for the specified property using the container type and property name. (Overrides ModelMetadataProvider.GetMetadataForProperty(Func<Object>, Type, String).)
	GetMetadataForType	Returns the metadata for the specified property using the type of the model. (Overrides ModelMetadataProvider.GetMetadataForType(Func<Object>, Type).)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetTypeDescriptor	Returns the type descriptor from the specified type.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

A metadata provider provides metadata for the model within a view. Metadata providers must derive from ModelMetadataProvider. You can inherit from this class if you want to use a custom validator or a third-party validator that uses attribute-based metadata.

This class implements the abstract methods of ModelMetadataProvider and contains only one additional abstract method. When you implement this class, use the AssociatedValidatorProvider class to implement the validator.

Model provider classes and validator provider classes are loosely coupled. Therefore, they work independently, and have no dependencies on each other.

However, the metadata provider exposes metadata that can be accessed and used by validation providers. For example, the MVC default metadata provider (the DataAnnotationsModelMetadataProvider class) reads the display name of an object, and the display name is used by the DataAnnotationsModelValidatorProvider validation provider when it creates a validation error message.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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