Calling another class method in a Task c#

Question

I’m trying to make a task call from a method of another Class:

Diretorios diretorios = new Diretorios();
await Task.Run(() => diretorios.CopiaDiretorios(tbxVersaoAtual.Text, tbxServerCopia.Text));

Only I get the following Exception:

System.Invalidoperationexception: 'The call thread cannot access this object because it belongs to a different thread.'

It’s really not possible to do what I’m trying to do?

I really need to wait for the execution of this method before proceeding with the execution and I can’t block the Thread UI so I need to run a Task.

PS: The call method is async and the called method is returning a Task as it should be.

Some solution?

Answer 1

The answer is basically the same as this question here: Modify visual element by another thread

The difference is that, in WPF, each control has a property called Dispatcher which contains the elements necessary to make the Invoke.

Functional example:

private void button_Click(object sender, RoutedEventArgs e)
{
    Task.Run(() =>
    {
        Thread.Sleep(5000);
        SetText(textBox, "Qualquer texto");
    });
}

public static void SetText(TextBox txtbox, string texto)
{
    if (txtbox.Dispatcher.CheckAccess())
        txtbox.Text = texto;            
    else
        txtbox.Dispatcher.Invoke(() => txtbox.Text = texto, DispatcherPriority.Normal);
}

Answer 2

RESOLVED!

In fact I had to change the return of the method I was called from Void to Task.

After doing so it worked.

Anyway, thank you so much