CustomValidationAttribute Class

Reference

Definition

Namespace:: System.ComponentModel.DataAnnotations

Assembly:: System.ComponentModel.Annotations.dll

Assemblies:: System.ComponentModel.Annotations.dll, System.ComponentModel.DataAnnotations.dll

Assembly:: System.ComponentModel.DataAnnotations.dll

Source:: CustomValidationAttribute.cs

Source:: CustomValidationAttribute.cs

Source:: CustomValidationAttribute.cs

Important

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Specifies a custom validation method that is used to validate a property or class instance.

public ref class CustomValidationAttribute sealed : System::ComponentModel::DataAnnotations::ValidationAttribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Field | System.AttributeTargets.Method | System.AttributeTargets.Parameter | System.AttributeTargets.Property, AllowMultiple=true)]
public sealed class CustomValidationAttribute : System.ComponentModel.DataAnnotations.ValidationAttribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Field | System.AttributeTargets.Method | System.AttributeTargets.Parameter | System.AttributeTargets.Property, AllowMultiple=true)>]
type CustomValidationAttribute = class
    inherit ValidationAttribute

Public NotInheritable Class CustomValidationAttribute
Inherits ValidationAttribute

Inheritance: Object

Attribute

ValidationAttribute
CustomValidationAttribute

Attributes: AttributeUsageAttribute

Remarks

The CustomValidationAttribute attribute is used to perform custom validation when the IsValid method is invoked to perform validation. The IsValid method then redirects the call to the method that is identified by the Method property, which in turn performs the actual validation.

The CustomValidationAttribute attribute can be applied to types, properties, fields, methods, and method parameters. When it is applied to a property, the attribute is invoked whenever a value is assigned to that property. When it is applied to a method, the attribute is invoked whenever the program calls that method. When it is applied to a method parameter, the attribute is invoked before the method is called.

For more information about using attributes, see Attributes.

Constructors

CustomValidationAttribute(Type, String)

Initializes a new instance of the CustomValidationAttribute class.

Properties

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

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
FormatErrorMessage(String)	Formats a validation error message.
GetHashCode()	Returns the hash code for this instance. (Inherited from Attribute)
GetType()	Gets the Type of the current instance. (Inherited from Object)
GetValidationResult(Object, ValidationContext)	Checks whether the specified value is valid with respect to the current validation attribute. (Inherited from ValidationAttribute)
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. (Inherited from ValidationAttribute)
IsValid(Object, ValidationContext)	Validates the specified value with respect to the current validation attribute. (Inherited from ValidationAttribute)
Match(Object)	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, String)	Validates the specified object. (Inherited from ValidationAttribute)
Validate(Object, ValidationContext)	Validates the specified object. (Inherited from ValidationAttribute)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)	Provides access to properties and methods exposed by an object. (Inherited from Attribute)

Applies to