Transform many example (using observable collection)

TransformMany.txt

/*
* This example works with observable collection. When using reactive list add package DynamicData.ReactiveUI (Use dynamic data v4x -  later version are based off rx3x with rxui does not support)
* Normally with dd you would manage a collection independent of binding i.e. use SourceCache<T,K> or SourceList<T>, shape the collection and uae the Bind() operator to maintain an observable collection. See github homepage for links and examples
*/

ObservableCollection<A> listOfA = new ObservableCollection<A>();
 
//create a collection to bind to
ReadOnlyObservableCollection<B> binding;

// OPTION 1: if listb is IEnumerable<B>
var loader = listOfA.ToObservableChangeSet() //change collection into an observable changeset
    .TransformMany(a => a.ListOfB)           //select many items
    //maybe sort first + push onto UI thread
    .Bind(out binding)
    .Subscribe();

// OPTION 2: if listb is ObservableCollection<B>
var loader = listOfA.ToObservableChangeSet()
    .TransformMany(a => a.ListOfB.ToObservableChangeSet())
    .Or()                                     //apply a logic all to all of the inner collections
    //maybe sort first + push onto UI thread
    .Bind(out binding)
    .Subscribe();