Book Image

C# 7 and .NET: Designing Modern Cross-platform Applications

By : Mark J. Price, Ovais Mehboob Ahmed Khan
Book Image

C# 7 and .NET: Designing Modern Cross-platform Applications

By: Mark J. Price, Ovais Mehboob Ahmed Khan

Overview of this book

C# is a widely used programming language, thanks to its easy learning curve, versatility, and support for modern paradigms. The language is used to create desktop apps, background services, web apps, and mobile apps. .NET Core is open source and compatible with Mac OS and Linux. There is no limit to what you can achieve with C# and .NET Core. This Learning Path begins with the basics of C# and object-oriented programming (OOP) and explores features of C#, such as tuples, pattern matching, and out variables. You will understand.NET Standard 2.0 class libraries and ASP.NET Core 2.0, and create professional websites, services, and applications. You will become familiar with mobile app development using Xamarin.Forms and learn to develop high-performing applications by writing optimized code with various profiling techniques. By the end of C# 7 and .NET: Designing Modern Cross-platform Applications, you will have all the knowledge required to build modern, cross-platform apps using C# and .NET. This Learning Path includes content from the following Packt products: • C# 7.1 and .NET Core 2.0 - Modern Cross-Platform Development - Third Edition by Mark J. Price • C# 7 and .NET Core 2.0 High Performance by Ovais Mehboob Ahmed Khan
Table of Contents (25 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
16
Designing Guidelines for .NET Core Application Performance
Index

Splitting classes using partial


When working on large projects with multiple team members, it is useful to be able to split the definition of a complex class across multiple files. You do this using the partial keyword.

Imagine we want to add a new method to the Person class without having to ask another programmer to close the Person.cs file. If the class is defined as partial, then we can split it over as many separate files as we like.

In the Person class, add the partial keyword, as shown highlighted in the following code:

namespace Packt.CS7 
{ 
   public partial class Person 
   { 

In Visual Studio 2017, navigate to Project | Add Class... or press Shift + Alt + C. Enter the name Person2. We cannot enter Person because Visual Studio 2017 isn't smart enough to understand what we want to do. Instead, we must now rename the new class to Person, change the namespace, and add the public partial keywords, as shown in the following code:

namespace Packt.CS7 
{ 
   public partial class Person 
...