Assembly: System.Workflow.ComponentModel (in system.workflow.componentmodel.dll)
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.
By default, validators will validate meta properties; they do not validate instance properties which are settable at runtime.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.