Combobox.Selectedindex does not return the item in Windows Forms

Question

I have a program in windows Forms and I need to select the item in a combo box so that the user can edit the record, however, it receives the value, finds the index but does not return the selected on the screen. follows the code:

private void PreencherCbox(List<Natureza> lista)
    {
        List<CboxModel> model = new List<CboxModel>();

        CboxModel p = new CboxModel();

        p.Text = "Selecione uma natureza";
        p.Value = "0";

        model.Add(p);

        foreach (Natureza n in lista)
        {
            CboxModel m = new CboxModel();
            m.Text = n.Descricao;
            m.Value = n.Id.ToString();

            model.Add(m);
        }

        this.CboxNatureza.DataSource = model;
        CboxNatureza.DisplayMember = "Text";
        CboxNatureza.ValueMember = "Value";
    }

and when to receive the value and select:

this.CboxNatureza.SelectedIndex = CboxNatureza.FindStringExact(e.Natureza.Descricao);

I have another piece of code that is the same, but it works. Help! = D

Answer 1

You are creating a model (CboxModel), just to add a simple text (Select a nature), you have tried using a Label to illustrate such a text?

Try it like this:

• The estate .SelectedIndex receiving -1, leaves the text field empty.
• Use the property .SelectedValue for the return of the item, note that the property .ValueMember was fed the ID field class Natureza which is in the List<>, so it goes returns a number.
• The type of return of .SelectedValue is a object, then depending on the use mind the treatment.

Soon your code would look like this:

//-->Seu Método
private void PreencherCbox(List<Natureza> lista){
   this.CboxNatureza.DataSource = lista;
   CboxNatureza.DisplayMember = "Descricao";
   CboxNatureza.ValueMember = "Id";
   CboxNatureza.SelectedIndex = -1;       
}