ActivityValidator Klasse

Definition

public ref class ActivityValidator : System::Workflow::ComponentModel::Compiler::DependencyObjectValidator

public class ActivityValidator : System.Workflow.ComponentModel.Compiler.DependencyObjectValidator

[System.Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")]
public class ActivityValidator : System.Workflow.ComponentModel.Compiler.DependencyObjectValidator

type ActivityValidator = class
    inherit DependencyObjectValidator

[<System.Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")>]
type ActivityValidator = class
    inherit DependencyObjectValidator

Public Class ActivityValidator
Inherits DependencyObjectValidator

Vererbung

Object

Validator

DependencyObjectValidator

ActivityValidator

Abgeleitet

System.Workflow.Activities.CallExternalMethodActivityValidator

System.Workflow.Activities.HandleExternalEventActivityValidator

System.Workflow.ComponentModel.Compiler.CompositeActivityValidator

Attribute

ObsoleteAttribute

Beispiele

Das folgende Beispiel zeigt einen vollständigen ActivityValidator, der für eine benutzerdefinierte Aktivität verwendet wird. Die benutzerdefinierte Aktivität ist eine ConsoleWriteLineActivity-Aktivität, die über eine einzelne Abhängigkeitseigenschaft mit der Bezeichnung Msg vom Typ String verfügt. Das Validierungssteuerelement stellt sicher, dass die Msg-Eigenschaft festgelegt wird. Wurde diese Eigenschaft nicht festgelegt, zeigt der Compiler einen Fehler an, wenn die Validate-Methode vom ActivityValidator aufgerufen wird, und die Kompilierung schlägt fehl.

class ConsoleWriteLineActivityValidator : ActivityValidator
{
    public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
    {
        // Invoke the base class method implementation to
        // perform default validation.
        ValidationErrorCollection errors = base.Validate(manager, obj);

        // Make sure there is an activity instance.
        ConsoleWriteLineActivity crw = obj as ConsoleWriteLineActivity;
        if (crw == null)
        {
            throw new InvalidOperationException();
        }

        // If the activity has no parent then this validation
        // is occurring during the compilation of the activity
        // and not during the hosting or creation of an
        // activity instance.
        if (crw.Parent == null)
        {
            // Can skip the rest of the validation because
            // it deals with the hosting and the creation
            // of the activity.
            return errors;
        }

        // Msg is required. Add a validation error if there is no
        // Msg specified or Msg is not bound to another property.
        if (string.IsNullOrEmpty(crw.Msg) &&
            crw.GetBinding(ConsoleWriteLineActivity.MsgProperty) == null)
        {
            errors.Add(new ValidationError("Msg is required", 100, false, "Msg"));
        }

        return errors;
    }
}

Class ConsoleWriteLineActivityValidator
    Inherits ActivityValidator

    Public Overrides Function Validate( _
        ByVal manager As System.Workflow.ComponentModel.Compiler.ValidationManager, _
        ByVal obj As Object) As System.Workflow.ComponentModel.Compiler.ValidationErrorCollection

        'Invoke the base class method implementation to
        'perform default validation.
        Dim errors As ValidationErrorCollection = MyBase.Validate(manager, obj)

        'Make sure there is an activity instance.
        Dim crw As ConsoleWriteLineActivity = CType(obj, ConsoleWriteLineActivity)
        If crw Is Nothing Then
            Throw New InvalidOperationException()
        End If

        'If the activity has no parent then this validation
        'is occurring during the compilation of the activity
        'and not during the hosting or creation of an
        'activity instance.
        If crw.Parent Is Nothing Then
            'Can skip the rest of the validation because
            'it deals with the hosting and the creation
            'of the activity.
            Return errors
        End If

        'Msg is required. Add a validation error if there is no
        'Msg specified or Msg is not bound to another property.
        If String.IsNullOrEmpty(crw.Msg) And _
            crw.GetBinding(ConsoleWriteLineActivity.MsgProperty) Is Nothing Then

            errors.Add(New ValidationError("Msg is required", 100, False, "Msg"))

        End If

        Return errors
    End Function
End Class

Hinweise

Konstruktoren

Methoden

Gilt für