private static IntPtr CreateNativeNCCEventArgsInstanceHelper(int action, IntPtr newItem, IntPtr oldItem, int newIndex, int oldIndex)
{
if (s_EventArgsFactory == null)
{
object factory = null;
Guid guid = typeof(INotifyCollectionChangedEventArgsFactory).GUID;
int hr = Interop.mincore.RoGetActivationFactory(WinRTNotifyCollectionChangedEventArgsName, ref guid, out factory);
if (hr < 0)
{
Marshal.ThrowExceptionForHR(hr);
}
s_EventArgsFactory = (INotifyCollectionChangedEventArgsFactory)factory;
}
IntPtr inner = IntPtr.Zero;
return(s_EventArgsFactory.CreateInstanceWithAllParameters(action, newItem, oldItem, newIndex, oldIndex, IntPtr.Zero, ref inner));
}
// Extracts properties from a managed NotifyCollectionChangedEventArgs and passes them to
// a VM-implemented helper that creates a WinRT NotifyCollectionChangedEventArgs instance.
// This method is called from IL stubs and needs to have its token stabilized.
internal static IntPtr ConvertToNative(NotifyCollectionChangedEventArgs managedArgs)
{
if (managedArgs == null)
return IntPtr.Zero;
if (s_EventArgsFactory == null)
{
object factory = null;
Guid guid = typeof(INotifyCollectionChangedEventArgsFactory).GUID;
int hr = Interop.mincore.RoGetActivationFactory(WinRTNotifyCollectionChangedEventArgsName, ref guid, out factory);
if (hr < 0)
Marshal.ThrowExceptionForHR(hr);
s_EventArgsFactory = (INotifyCollectionChangedEventArgsFactory)factory;
}
object inner = null;
return s_EventArgsFactory.CreateInstanceWithAllParameters((int)managedArgs.Action, managedArgs.NewItems, managedArgs.OldItems, managedArgs.NewStartingIndex, managedArgs.OldStartingIndex, null, ref inner);
}
