Question

I have the following code :

public partial class ModificarAlimento : Form
{
    private Alimento alim;
    private Dictionary<string, Nutriente> nutrientes;

    public ModificarAlimento(Alimento a, Dictionary<string, Nutriente> nut)
    {
        InitializeComponent();
        this.nutrientes = nut;
        alim = a;

        int i = 0;
        foreach (KeyValuePair<string, CantidadNutrientes> x in alim.Nutrientes) 
        {
            ComboBox n = new ComboBox();
            n.DropDownStyle = ComboBoxStyle.DropDownList;
            n.Location = new Point(12, 25 * (i + 1) + 80);
            n.DataSource = new BindingSource(nutrientes, null);
            n.DisplayMember = "Key";
            n.ValueMember = "Value";
            TextBox cNuts = new TextBox();
            cNuts.Location = new Point(150, 25 * (i + 1) + 80);
            cNuts.Size = new Size(50, cNuts.Size.Height);
            cNuts.Text = x.Value.Cantidad.ToString();
            this.Controls.Add(n);
            this.Controls.Add(cNuts);
            i++;
            n.SelectedValue = x.Value.Nutriente;
        }
    }

    private void ModificarAlimento_Load(object sender, EventArgs e)
    {

    }
}

Now. The problem is here:

n.SelectedValue = x.Value.Nutriente;

Each Alimento (Food) has a dictionary set of CantidadNutrientes, which stores a double value and a Nutriente (Nutrient), which in turn stores a name. So, calling

x.Value.Nutriente

will retrieve the Nutriente in the CantidadNutrientes stored in x.

Why isn’t this working? Any help is appreciated.

EDIT: I’m also trying this

n.SelectedIndex = n.FindStringExact(x.Key);
//and
n.SelectedValue = n.FindStringExact(x.Value.Nutriente.Nombre);

However for some weird reason it works while I debug, but if I don’t go through line for line it doesn’t work at all.

Answer 1

Try putting

n.CreateControl();

before this.Controls.Add(), and put

n.SelectedItem = 
  n.Items
   .Cast<KeyValuePair<string, Nutriente>>()
   .SingleOrDefault(o => o.Key == x.Key);

after call to this.Controls.Add()