列表框和隔离存储

Question

I have two questions about Windows Phone Development:

I have two ListBox ( ListBox1 , ListBox2 )

I save my items in ListBox1 with isolated storage.

I want to get the selected item from ListBox1 and put it in the ListBox2 saving in isolated storage2

When I click on the button to get the selected item in the Listbox1 and put for the ListBox2 my application saves all the items that are in ListBox1 and saves on the Listbox2 .

My code:

//Isolated Storage

private IsolatedStorageSettings _ListaCompras;
private IsolatedStorageSettings _ListaComprado;
_ListaCompras = IsolatedStorageSettings.ApplicationSettings;
_ListaComprado = IsolatedStorageSettings.ApplicationSettings;

//Save Item in ListBox1
private void button1_Click(object sender, RoutedEventArgs e)
{
     if (textBoxProduto.Text != string.Empty)
     {
         _ListaCompras.Add(textBoxProduto.Text, "Produto");
         _ListaCompras.Save();
         salvarLista();
         contador();
     }
     else MessageBox.Show("Informe o Produto"); 
 } 

 //Get the Selected item for ListBox1 and put the ListBox2

 private void button3_Click(object sender, RoutedEventArgs e)
 {
     if ((listBoxComprar.Items.Count <= 0) || (this.listBoxComprar.SelectedIndex == -1))
     MessageBox.Show("Selecione um item na lista de pendentes");
     else
     {
       _ListaComprado.Add(listBoxComprar.SelectedItem.ToString(), "ProdutoComprado");
       _ListaComprado.Save();
       salvarLista2();
     }
  }

//BIND KEYS

  public void salvarLista() 
  {
       listBoxComprar.Items.Clear();
       foreach (string key in _ListaCompras.Keys)
       {
           this.listBoxComprar.Items.Add(key);
       }
       textBoxProduto.Text = "";
   }
   public void salvarLista2()
   {
       listBoxComprado.Items.Clear();
       foreach (string key2 in _ListaComprado.Keys)
       {
            this.listBoxComprado.Items.Add(key2);       
       }
   }   

Answer 1

The question is not very clear but I think I figured it out. You are saving the value as key and a string as value in the applicationsettings. This should be the other way around, the string (Produto and ProdutoComprado) as keys and the values as values.

I think you have the Add(key, value) statement mixed up. msdn

So

_ListaCompras.Add(textBoxProduto.Text, "Produto");

should be:

_ListaCompras.Add("Produto", textBoxProduto.Text);

and

_ListaComprado.Add(listBoxComprar.SelectedItem.ToString(), "ProdutoComprado");

should be:

_ListaComprado.Add("ProdutoComprado", listBoxComprar.SelectedItem.ToString());