NMF Expressions

NMF Expressions is a library for building dynamic dependency graphs to support incremental change propagation.

Why should I use this package?

This package contains a library to execute queries and expressions in .NET with incremental change propagation by constructing a dynamic dependency graph (DDG).

For collections, we introduce two new monads:

• INotifyEnumerable<T> essentially combines IEnumerable<T> with INotifyCollectionChanged, allowing queries over collections that support change propagation
• IEnumerableExpression<T> behaves like IEnumerable<T> but has a dedicated method AsNotifiable to switch to incremental change propagation. This is meant for scenarios where the decision for or against incremental change propagation is delayed to runtime.

For both of these monads, many of the standard query operators are implemented, allowing you to obtain incremental change propagation e.g. for C# queries.

To support ObservableCollection<T>, there is also an extension method WithUpdates that tries to cast a collection to INotifyCollectionChanged in order to provide change notifications.

However, the library is not limited to queries, you can also obtain incremental change propagation for arbitrary functions using the classes ObservingFunc. These are a bit like the framework Func classes except that besides Invoke, they offer an Observe method that uses change notifications picked up using INotifyPropertyChanged and explicit implementations of dynamic algorithms to obtain efficient DDGs.

Where can I get more information?

There is a documentation website which we try to maintain that contains a few tutorials. There are publications if you want to explore the technical details. Also, please feel free to .