ActivityValidator.Validate(ValidationManager, Object) Метод

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

ValidationErrorCollection

Коллекция ValidationErrorCollection, содержащая все ошибки и предупреждения, полученные в ходе проверки.

Следующий пример показывает, как переопределить метод Validate для объекта ActivityValidator, который используется для пользовательского действия с единственным свойством зависимостей с именем Msg типа String. Проверяющий элемент удостоверяется, что свойство Msg задано. Если оно не задано, компилятор выводит ошибку при вызове метода Validate на объекте ActivityValidator, и компиляция завершается с ошибкой.

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

Этот метод вызывает метод ValidateProperties для проверки свойств действия Activity.

Этот метод проверяет только уникальность имени Name для действия Activity, если действие Activity не является корневым действием Activity.