Methodinvoker does not update listbox C#

Question

How to implement a timer that updates a listbox in c every cycle#;

Method to create the timer:

private void CriaTimer()
{
    System.Timers.Timer aTimer = new System.Timers.Timer();
    aTimer.Elapsed += OnTimedEvent;
    aTimer.Interval = 100;
    aTimer.Enabled = true;
}

private void OnTimedEvent(object sender, ElapsedEventArgs e)
{
    AtualizaControlesForm();
}

Method to update components:

public void AtualizaControlesForm()
{
   Invoke(new MethodInvoker(() => this.lblPorcentagemGeracao.Text = UtilidadesGeraSped.valorProgressoGeracao + "%"));
   Invoke(new MethodInvoker(() => this.listBoxInformacoesLog.DataSource = Mensagens.logErroseInfo));
   Invoke(new MethodInvoker(() => this.listBoxInformacoesLog.Refresh()));
}

Is updating the textLabel, but does not update the listbox;

Answer 1

The listbox notes changes in the object you are passing to the property Datasource, setting the same object does not help, the object itself has to be modified.

One solution is to use the class BindingList, every time an item is added to it, the listbox will be automatically informed:

BindingList is a class of namespace System.ComponentModel.

Example:

// TipoDoDado é o tipo do item que vai no seu listbox, 
// no seu caso é o item dentro da lista logErroseInfo.
static BindingList<TipoDoDado> data = new BindingList<TipoDoDado>();

MeuConstrutor()
{
    this.listBoxInformacoesLog.Datasource = data;
}

private void CriaTimer()
{
    System.Timers.Timer aTimer = new System.Timers.Timer();
    aTimer.Elapsed += OnTimedEvent;
    aTimer.Interval = 100;
    aTimer.Enabled = true;
}

private void OnTimedEvent(object sender, ElapsedEventArgs e)
{
    AtualizaControlesForm();
}

public void AtualizaControlesForm()
{
   Invoke(new MethodInvoker(() => this.lblPorcentagemGeracao.Text = UtilidadesGeraSped.valorProgressoGeracao + "%"));

   // Adicione aqui novos itens a lista 
   // Ex.: data.Add(novoItem);
}