Using LINQ to perform queries

Rx allows developers to use the IObservable interface, which represents synchronous datastreams, to write queries using LINQ. To recap, Rx can be thought of as consisting of three sections:

• Observables: The interface that brings together and represents all these datastreams
• Language-Integrated Query (LINQ): The ability to use LINQ to query these multiple datastreams
• Schedulers: Parameterizing concurrency using schedulers

In this recipe, we will be looking at the LINQ functionality of Rx in more detail.

Getting ready

As observables are just datastreams, we can use LINQ to query them. In the following recipe, we will output text to the screen based on a LINQ query.

How to do it...

1. Start by adding a new Windows forms project to your solution.

2. Call the project winformRx and click on the OK button:

3. In Toolbox, search for the TextBox control and add it to your form.

4. Finally, add a label control to your form:

 

5. Right-click on your winformRx project and select Manage NuGet Packages...