/// <summary>
/// Apply AutoPersistence to all objects in a collection. Items that are
/// no longer in the collection won't be persisted anymore.
/// </summary>
/// <param name="doPersist">The asynchronous method to call to save the
/// object to disk.</param>
/// <param name="manualSaveSignal">When invoked, the object will be saved
/// regardless of whether it has changed.</param>
/// <param name="interval">The interval to save the object on. Note that
/// if an object is constantly changing, it is possible that it will never
/// be saved.</param>
/// <returns>A Disposable to disable automatic persistence.</returns>
public static IDisposable AutoPersistCollection <T, TDontCare>(this IReactiveCollection <T> This, Func <T, IObservable <Unit> > doPersist, IObservable <TDontCare> manualSaveSignal, TimeSpan?interval = null)
where T : IReactiveObject
{
var disposerList = new Dictionary <T, IDisposable>();
var disp = This.ActOnEveryObject(
x => {
if (disposerList.ContainsKey(x))
{
return;
}
disposerList[x] = x.AutoPersist(doPersist, manualSaveSignal, interval);
},
x => {
disposerList[x].Dispose();
disposerList.Remove(x);
});
return(Disposable.Create(() => {
disp.Dispose();
disposerList.Values.ForEach(x => x.Dispose());
}));
}