Question

I have a WPF application containing several ComboBoxes. The ItemsSource of some of the comboboxes is bound to a list of objects. I want to bind a text property of each combobox to some property of MyObject. Each time a user selects some row in MyListView, I update the properties of MyObject, and I want the text properties of the comboboxes to update as well.

This is the XAML for one of the comboboxes:

<StackPanel Orientation="Vertical" x:Name="StackPanel_MyStackPanel">
    <ComboBox x:Name="comboBox_MyComboBox"
              IsEditable="True"
              ItemsSource="{Binding}"
              Text="{Binding Path=MyProperty}" /> 
</StackPanel>

In the code behind:

MyObject myObject = new MyObject();

// On the selection changed event handler of the MyListView,
// I update the MyProperty of the myObject.

this.StackPanel_MyStackPanel.DataContext = myObject;

the definition of MyObject:

public class MyObject
{
    private string _MyProperty;

    public string MyProperty
    {
        get { return _MyProperty; }
        set { _MyProperty = value; }
    }
}

This is not working…. and I don’t know why.

Answer 1

Your data class needs to implement INotifyPropertyChanged:

public class MyObject : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private string _MyProperty; 
    public string MyProperty
    { 
        get { return _MyProperty;} 
        set
        {
            _MyProperty = value;
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs("MyProperty"));
            }
        } 
    } 
}