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ValidationAttribute Class

.NET Framework 4.5

Serves as the base class for all validation attributes.

System.Object
  System.Attribute
    System.ComponentModel.DataAnnotations.ValidationAttribute
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Namespace: System.ComponentModel.DataAnnotations
Assembly: System.ComponentModel.DataAnnotations (in System.ComponentModel.DataAnnotations.dll)

Syntax

C++

public abstract class ValidationAttribute : Attribute

The ValidationAttribute type exposes the following members.

Constructors

	Name	Description
	ValidationAttribute()	Initializes a new instance of the ValidationAttribute class.
	ValidationAttribute(Func<String>)	Initializes a new instance of the ValidationAttribute class by using the function that enables access to validation resources.
	ValidationAttribute(String)	Initializes a new instance of the ValidationAttribute class by using the error message to associate with a validation control.

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Properties

	Name	Description
	ErrorMessage	Gets or sets an error message to associate with a validation control if validation fails.
	ErrorMessageResourceName	Gets or sets the error message resource name to use in order to look up the ErrorMessageResourceType property value if validation fails.
	ErrorMessageResourceType	Gets or sets the resource type to use for error-message lookup if validation fails.
	ErrorMessageString	Gets the localized validation error message.
	RequiresValidationContext	Gets a value that indicates whether the attribute requires validation context.
	TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

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Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	FormatErrorMessage	Applies formatting to an error message, based on the data field where the error occurred.
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValidationResult	Checks whether the specified value is valid with respect to the current validation attribute.
	IsDefaultAttribute	When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
	IsValid(Object)	Determines whether the specified value of the object is valid.
	IsValid(Object, ValidationContext)	Validates the specified value with respect to the current validation attribute.
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)
	Validate(Object, ValidationContext)	Validates the specified object.
	Validate(Object, String)	Validates the specified object.

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Explicit Interface Implementations

	Name	Description
	_Attribute.GetIDsOfNames	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
	_Attribute.GetTypeInfo	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
	_Attribute.GetTypeInfoCount	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
	_Attribute.Invoke	Provides access to properties and methods exposed by an object. (Inherited from Attribute.)

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Exceptions

Exception	Condition
ValidationException	The ErrorMessageResourceType and ErrorMessageResourceName properties for localized error message are set at the same time that the non-localized ErrorMessage property error message is set.

Remarks

This class enforces validation, based on the metadata that is associated with the data table. You can override this class to create custom validation attributes.

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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.

Reference

System.ComponentModel.DataAnnotations Namespace

Other Resources

How to: Customize Data Field Validation in the Data Model Using Custom Attributes

Inheritance Hierarchy

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