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Validator Class

Base class for all validator components.

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

public class Validator

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.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5, 3.0