Using LINQ queries against an observable collection

This recipe shows you how to use LINQ to query an asynchronous sequence of events.

Getting ready

To work through this recipe, you will need Visual Studio 2015. No other prerequisites are required. The source code for this recipe can be found at BookSamples\Chapter8\Recipe5.

How to do it...

To understand the use of LINQ queries against the observable collection, perform the following steps:

1. Start Visual Studio 2015. Create a new C# console application project.

2. Add a reference to the Reactive Extensions Main Library NuGet package. Refer to the Converting a collection to asynchronous observable recipe for details on how to do this.

3. In the Program.cs file, add the following using directives:

   using System;
   using System.Reactive.Linq;
   using static System.Console;

4. Add the following code snippet below the Main method:

   static IDisposable OutputToConsole<T>(IObservable<T> sequence, int innerLevel)
   {
     string delimiter = innerLevel == 0 
         ...