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Functional C#

You're reading from   Functional C# Uncover the secrets of functional programming using C# and change the way you approach your applications

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Product type Paperback
Published in Dec 2016
Publisher Packt
ISBN-13 9781785282225
Length 370 pages
Edition 1st Edition
Languages
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Author (1):
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Wisnu Anggoro Wisnu Anggoro
Author Profile Icon Wisnu Anggoro
Wisnu Anggoro
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Table of Contents (12) Chapters Close

Preface 1. Tasting Functional Style in C# 2. Walkthrough Delegates FREE CHAPTER 3. Expressing Anonymous Methods with Lambda Expressions 4. Extending Object Functionality with Extension Methods 5. Querying Any Collection Easily with LINQ 6. Enhancing the Responsiveness of the Functional Program with Asynchronous Programming 7. Learning Recursion 8. Optimizing the Code using Laziness and Caching Techniques 9. Working with Pattern 10. Taking an Action in C# Functional Programming 11. Coding Best Practice and Testing the Functional Code

Developing functional programming in Windows forms

Now, we are going to develop a calculator application in a Windows forms application. For this purpose, we have to create a new Windows forms project and a new form with several buttons to contain the numbers 0 to 9 and additional functionality, such as the following screenshot:

Developing functional programming in Windows forms

As you can see, we have 10 buttons that represent the numbers 0 to 9 and standard mathematical operators such as add (+), subtract (-), multiply (*), and divide (/). We also have some additional function buttons; they are square root (sqrt), percent (%) and inverse (1/x). The rest includes these buttons: switch sign (+/-), decimal (.), Clear Entry (CE), Clear All (C), and Backspace (del). We also have a textbox to display the number we entered and set at the top of the form. Last but not least, there is always an equal button in all calculator applications. We give names to all these controls, as shown in the following code snippet:

namespace CalculatorImperative...
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