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ValidationAttribute Class

Serves as the base class for all validation attributes.

Namespace:  System.ComponentModel.DataAnnotations
Assembly:  System.ComponentModel.DataAnnotations (in System.ComponentModel.DataAnnotations.dll)

public abstract class ValidationAttribute : Attribute

The ValidationAttribute type exposes the following members.

  NameDescription
Protected methodValidationAttribute()Initializes a new instance of the ValidationAttribute class.
Protected methodValidationAttribute(Func<String>)Initializes a new instance of the ValidationAttribute class by using the function that enables access to validation resources.
Protected methodValidationAttribute(String)Initializes a new instance of the ValidationAttribute class by using the error message to associate with a validation control.
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  NameDescription
Public propertyErrorMessageGets or sets an error message to associate with a validation control if validation fails.
Public propertyErrorMessageResourceNameGets or sets the error message resource name to use in order to look up the ErrorMessageResourceType property value if validation fails.
Public propertyErrorMessageResourceTypeGets or sets the resource type to use for error-message lookup if validation fails.
Protected propertyErrorMessageStringGets the localized validation error message.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodFormatErrorMessageApplies formatting to an error message, based on the data field where the error occurred.
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValidationResultChecks whether the specified value is valid with respect to the current validation attribute.
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodIsValid(Object)Determines whether the specified value of the object is valid.
Protected methodIsValid(Object, ValidationContext)Validates the specified value with respect to the current validation attribute.
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodValidate(Object, ValidationContext)Validates the specified object.
Public methodValidate(Object, String)Validates the specified object.
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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ExceptionCondition
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.

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.

.NET Framework

Supported in: 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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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