Using LINQ queries against the observable collection

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

Getting ready

To step through this recipe, you will need Visual Studio 2012. No other prerequisites are required. The source code for this recipe can be found at BookSamples\Chapter8\Recipe5.

How to do it...

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

1. Start Visual Studio 2012. Create a new C# Console Application project.

2. Add reference to 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;

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

   static IDisposable OutputToConsole<T>(IObservable<T> sequence, int innerLevel)
   {
     string delimiter = innerLevel == 0 ? string.Empty : new string('-', innerLevel*3);
     return...