Dependency Error

Question

I’m using the BackgroundWorker

private BackgroundWorker BGWorker = new BackgroundWorker();
BGWorker.DoWork += BGWorker_DoWork;
BGWorker.RunWorkerAsync();

private void BGWorker_DoWork(object sender, DoWorkEventArgs e)
{
   ObterInformacoes();
}

private void BGWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    dgv.ItemsSource = ObterInformacoes();
}

private List<Informacoes> ObterInformacoes()
{
    List<Informacoes> func = gestores.gInfo.Recuperar(new Filtro[] { 
        new Filtro(eInfo.Ativa, true),
        new Filtro(eInfo.Recorrente, false)
    }).Select(f => new Informacoes(f)).ToList();

    return func.OrderBy(f => f.Nome).AsParallel().ToList();
}

And it’s returning to me this mistake:

Additional information: It is necessary to create Dependencysource in the same Thread that Dependencyobject.

Does anyone know what it can be?

Answer 1

I didn’t see the need to use the Backgroundworker in this example, since you call the method ObterInformacoes() in the method _DoWork from BW and then call him again at _RunWorkerCompleted.

this could be improved as follows:

private BackgroundWorker BGWorker = new BackgroundWorker();
BGWorker.DoWork += BGWorker_DoWork;
BGWorker.ReportProgress = true; //Atenção para esta linha
BGWorker.RunWorkerAsync();

private void BGWorker_DoWork(object sender, DoWorkEventArgs e)
{
   e.Result = ObterInformacoes();
}

private void BGWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    var lista = e.Result as List<Informacoes>;
    dgv.ItemsSource = lista;
}

private List<Informacoes> ObterInformacoes()
{
    List<Informacoes> func = gestores.gInfo.Recuperar(new Filtro[] { 
        new Filtro(eInfo.Ativa, true),
        new Filtro(eInfo.Recorrente, false)
    }).Select(f => new Informacoes(f)).OrderBy(f => f.Nome).ToList();

    return func;
}

I believe this should work.