.NET Framework Class Library
SupportsEventValidationAttribute Class

Defines the metadata attribute that Web server controls use to indicate support for event validation. This class cannot be inherited.

Inheritance Hierarchy

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)
<[%$TOPIC/ms223588_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/ms223588_en-us_VS_110_2_0_0_0_1%].Class, AllowMultiple := False)> _
Public NotInheritable Class SupportsEventValidationAttribute _
	Inherits [%$TOPIC/ms223588_en-us_VS_110_2_0_0_0_2%]
[[%$TOPIC/ms223588_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/ms223588_en-us_VS_110_2_0_1_0_1%].Class, AllowMultiple = false)]
public sealed class SupportsEventValidationAttribute : [%$TOPIC/ms223588_en-us_VS_110_2_0_1_0_2%]
[[%$TOPIC/ms223588_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/ms223588_en-us_VS_110_2_0_2_0_1%]::Class, AllowMultiple = false)]
public ref class SupportsEventValidationAttribute sealed : public [%$TOPIC/ms223588_en-us_VS_110_2_0_2_0_2%]
[<[%$TOPIC/ms223588_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/ms223588_en-us_VS_110_2_0_3_0_2%].Class, AllowMultiple = false)>]
type SupportsEventValidationAttribute =  
        inherit [%$TOPIC/ms223588_en-us_VS_110_2_0_3_0_3%] 

The SupportsEventValidationAttribute type exposes the following members.

Public method SupportsEventValidationAttributeInitializes a new instance of the SupportsEventValidationAttribute class.
Public property TypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public method EqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public method GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public method MatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public method ToStringReturns a string that represents the current object. (Inherited from Object.)
Explicit Interface Implementations
Explicit interface implemetation Private method _AttributeGetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeInvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)

Event validation prevents forged postbacks to an ASP.NET Web page and can be enabled through the EnableEventValidation page directive.

For more information, see EnableEventValidation. For more information about attributes, see Extending Metadata Using Attributes.

Notes to Implementers

If you do not define the SupportsEventValidationAttribute attribute, your custom control does not automatically participate in event validation. However, your control can explicitly call ValidateEvent. If you handle event registration and validation, call ValidateEvent, and then you do not need to define this attribute on the control.

Version Information

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

Windows 8.1, Windows Server 2012 R2, 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.