ActivityValidator.Validate(ValidationManager, Object) Méthode

Définition

Espace de noms:

System.Workflow.ComponentModel.Compiler

Assembly:

System.Workflow.ComponentModel.dll

Vérifie que l'activité donnée est valide.

public:
 override System::Workflow::ComponentModel::Compiler::ValidationErrorCollection ^ Validate(System::Workflow::ComponentModel::Compiler::ValidationManager ^ manager, System::Object ^ obj);

public override System.Workflow.ComponentModel.Compiler.ValidationErrorCollection Validate (System.Workflow.ComponentModel.Compiler.ValidationManager manager, object obj);

override this.Validate : System.Workflow.ComponentModel.Compiler.ValidationManager * obj -> System.Workflow.ComponentModel.Compiler.ValidationErrorCollection

Public Overrides Function Validate (manager As ValidationManager, obj As Object) As ValidationErrorCollection

Paramètres

manager

ValidationManager

ValidationManager associé à la validation.

obj

Object

Activity à valider.

Retours

ValidationErrorCollection

Un objet ValidationErrorCollection qui contient les erreurs ou les avertissements qui se sont produits pendant la validation.

Exemples

L'exemple suivant montre comment substituer la méthode Validate pour un ActivityValidator utilisé pour une activité personnalisée qui a une propriété de dépendance unique nommée Msg de type String. Le validateur personnalisé garantit que la propriété Msg est définie. S'il n'est pas défini, le compilateur affiche une erreur lorsque la méthode Validate est appelée sur le ActivityValidator et la compilation échoue.

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;
}

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

Remarques

Cette méthode appelle ValidateProperties pour valider les propriétés de Activity.

Cette méthode valide seulement l'unicité de Name pour Activity si Activity n'est pas un Activityracine.