Question

I have some interface and class that contain List

public interface IListContain
{
    Int32 ItemCount
    {
        get;
    }
}

public class myStackPanel : StackPanel, IListContain
{

    ... // implimentation ... 
}

I want to do binding between some TextBlock and the variable that ‘point’ on the object instance myStackPanel – so i wrote is in this way

XAML:

                <TextBlock x:Name="ItemCount" FontSize="12" Text="{Binding ElementName=ListContainObject, Path=ItemCount,Converter={StaticResource IntConverter}}" />

The convert code ( int to string )

 public class IntToStringConverter : IValueConverter
{        
    public object Convert( object value, Type targetType, object parameter, CultureInfo culture )
    {
        return ( ( int )value ).ToString();
    }

    public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture )
    {
        int result;
        var succes = int.TryParse( ( string )value, out result );
        return succes ? result : 0;
    }
}

And on the cs file of the xaml i define in the constructor the

      DataContext = this;

But still – nothing work !!!
I dont have fire convert event !!!

And i dont know what i did wrong.

Please help …

Thanks.
( this code is in silverlight and the ListContainObject is not null … its point on real object )

Answer 1

Can’t say for sure without you showing us your implementation, but it’s likely you’ve not used a dependency property for ItemCount / implemented INotifyPropertyChanged. Thus, WPF has no idea when the property is changing and the UI won’t update accordingly (nor will your redundant converter).