ActivityValidator.Validate(ValidationManager, Object) Método

Definição

Namespace:

System.Workflow.ComponentModel.Compiler

Assembly:

System.Workflow.ComponentModel.dll

Verifica se a atividade especificada é válida.

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

Parâmetros

manager

ValidationManager

O ValidationManager associado à validação.

obj

Object

O Activity a ser validado.

Retornos

ValidationErrorCollection

Um objeto ValidationErrorCollection que contém todos os erros ou avisos que ocorreram durante a validação.

Exemplos

O exemplo a seguir mostra como substituir o Validate método para uma ActivityValidator atividade personalizada que tem uma única propriedade de dependência nomeada Msg de tipo String. O validador personalizado garante que a Msg propriedade esteja definida. Se não estiver definido, o compilador exibirá um erro quando o Validate método for chamado e ActivityValidator a compilação falhar.

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

Comentários

Esse método chama ValidateProperties para validar as propriedades do Activity.

Esse método valida apenas a exclusividade do Name para o Activity se não Activity for uma raiz Activity.