Rx - Aggregate vs. Scan this post will focus on 2 Rx operators Aggregate and Scan . both Aggregate and Scan are dealing with event stream accumulation , the only difference is that Aggregate produce single result (upon the stream completion) and Scan present an ongoing runtime accumulation which react for each OnNext . both operators has 2 overloads with the same signature: Code Snippet IObservable <TSource> Aggregate<TSource>( this IObservable <TSource> source, Func <TSource...