private MultiBindingExpression(object[] dataItems, MultiBinding parentMultiBinding, Action updateSource)
{
DataItems = dataItems;
ParentMultiBinding = parentMultiBinding;
_updateSource = updateSource;
}
internal static MultiBindingExpression CreateFrom(MultiBinding parentMultiBinding, Action updateSource)
{
var dataItems = parentMultiBinding.Bindings.Select(binding => binding.Source).ToArray();
return(new MultiBindingExpression(dataItems, parentMultiBinding, updateSource));
}
private static void SaveMultibindingInfoForFutureAccess(MultiBindingTargetInfo multiBindingTargetInfo, MultiBinding multiBinding)
{
var frameworkElement = multiBindingTargetInfo.FrameworkElement;
RoutedEventHandler unloadedEventHandler = null;
unloadedEventHandler += (sender, args) =>
{
frameworkElement.Unloaded -= unloadedEventHandler;
MultiBindings.Remove(multiBindingTargetInfo);
};
frameworkElement.Unloaded += unloadedEventHandler;
MultiBindings[multiBindingTargetInfo] = multiBinding;
}
