.NET extension methods limitations

[ppr (Peter Preuss)]

check if the nuget package / extension is referenced by the dependency manager
check if the namespace is imported (imports)
check the xaml - as described here:

ZipFile function

@fightblue open XAML in an editor (e.g. notepad++) and add: System.IO.Compression.FileSystem [grafik] as the methods are subroutines and not functions you will use invoke method [grafik]