Question

I am a c++ developer and recently shifted to this amazing WPF world. I am developing a WPF application. I have a combobox (BusRate) in my xaml file.

<ComboBox Height="23" ItemsSource="{Binding BusRateList}" SelectedIndex="2" Name="comboBox2" Width="85" />

My Viewmodel class has the following property:

public ObservableCollection<int> _busRate = new ObservableCollection<int>();
public ObservableCollection<int> BusRateList
    {
        get { return _busRate; }
        set
        {
            _busRate = value;
            NotifyPropertyChanged("BusRateList");
        }
    }

And I add the items as follows:

_busRate.Add(10);
_busRate.Add(50);
_busRate.Add(100);
_busRate.Add(200);
_busRate.Add(300);
_busRate.Add(400);
_busRate.Add(500);
_busRate.Add(600);      

This gives me the items in my combobox. But I want to add these items into my combobox in the form of a array which holds all these values. E.g.:

// C++ Code
static const char *busRate[8] = 
{
" 10", " 50", "100", "200", "300", "400", "500", "600"
};

thus allowing me to perform the following operation oncomboboxitemselected method:

• Get the SelectedId from the Combobox and store it in a integer variable.

• pass this integer varaible. Demonstration as follows:

  int id = comboBox->getSelectedId(); // C++ Code
  unsigned long speed = String(busRate[id-1]).getIntValue(); // C++ Code
  

How can I achieve this in my application 🙂

Answer 1

You can create a new property in your ViewModel of type int and a converter which converts a string to an int value. Now you bind the new property to the ComboBox.SelectedItem-property:

<Window/UserControl/....Resouces>
    <local:YourConverter x:Key="TheConverter"/>
<Window/UserControl/....Resouces>

<ComboBox SelectedIten="{Binding Path=IntProp, Converter={StaticResource TheConverter}}"

EDIT:

int id = Convert.ToInt32(BusRateList[comboBox.SelectedIndex]);