public override object ProvideValue(IServiceProvider serviceProvider)
{
IProvideValueTarget provideValue = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
if (provideValue == null)
{
return(this);
}
DependencyObject target = provideValue.TargetObject as DependencyObject;
DependencyProperty property = provideValue.TargetProperty as DependencyProperty;
// If not dependency object or dependency property, return this instance
if (target == null || property == null)
{
return(this);
}
if (!ElementStateOperations.HasPropertyValue(target, property))
{
object defaultValue = PropertyValueConverter.ConvertFromString(target.GetType(), property, Default);
ElementStateOperations.AddPropertyValue(target, property, defaultValue);
}
BindingBase binding = ElementStateOperations.CreateBinding(target, property);
object startValue = binding.ProvideValue(serviceProvider);
return(startValue);
}
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (ElementStateOperations.HasPropertyValue(Target, Property))
{
object propertyValue = ElementStateOperations.GetPropertyValue(Target, Property);
return(propertyValue);
}
throw new ArgumentException(string.Format("The property {0}.{1} is not in state", Target, Property.Name));
}