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Validator Class

Validator Class

Note: This API is now obsolete.

Base class for all validator components.

Namespace:  System.Workflow.ComponentModel.Compiler
Assembly:  System.Workflow.ComponentModel (in System.Workflow.ComponentModel.dll)

<ObsoleteAttribute("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")> _
Public Class Validator

The Validator type exposes the following members.

Public methodValidatorInitializes a new instance of the Validator class.

Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Protected methodGetFullPropertyNameHelper method to extract the full property name.
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
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 methodValidateValidates the specified object and returns a collection of validation errors.
Public methodValidateActivityChangeWhen overridden in a derived class, validates a change based on a specified Activity being added or removed. This function is called during the application of changes that are made to the workflow during dynamic updates.
Public methodValidatePropertiesHelper method to automatically validate the specific objects properties.
Protected methodValidatePropertyPerforms validation on a property and returns a ValidationErrorCollection that contains the results of that validation.


This material discusses types and namespaces that are obsolete. For more information, see Deprecated Types in Windows Workflow Foundation 4.5.

The Validator class is used to ensure that activities are configured properly at design time. Validators are instantiated during design time when the designer validates the properties assigned to activities; if an activity's parameters are not configured properly, the designer will show smart tag errors for the incorrect values. Validators also run during compile time, and will return validation errors if constraints such as object parent or child type, minimum number of children, etc. are not correct. Validators will also run at runtime when a markup-based workflow is instantiated using the CreateWorkflow method.

The main purpose of a Validator is to ensure that errors are known during design time, and are not exposed as exceptions during runtime.

Validators are associated with the activities that they validate using the ValidatorTypeName attribute; all activity validators must inherit from the ActivityValidator class.

By default, validators will validate meta properties; they do not validate instance properties which are settable at runtime.

.NET Framework

Supported in: 4, 3.5, 3.0
Obsolete (compiler warning) in 4.6
Obsolete (compiler warning) in 4.6
Obsolete (compiler warning) in 4.5
Obsolete (compiler warning) in 4.5.1
Obsolete (compiler warning) in 4.5.2

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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