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Home > Programming > Programming Language > C# 7 and .NET Core: Modern Cross-Platform Development
C# 7 and .NET Core: Modern Cross-Platform Development
C# 7 and .NET Core: Modern Cross-Platform Development

C# 7 and .NET Core: Modern Cross-Platform Development: Create powerful cross-platform applications using C# 7, .NET Core, and Visual Studio 2017 or Visual Studio Code , Second Edition

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C# 7 and .NET Core: Modern Cross-Platform Development

Chapter 2. Speaking C#

This chapter is about the C# language---the grammar and vocabulary that you will use every day to write the source code for your applications.

Programming languages have many similarities to human languages, except that in programming languages, we can make up our own words, just like Dr. Seuss!

In a book written by Dr. Seuss in 1950, If I Ran the Zoo states that:

"And then, just to show them, I'll sail to Ka-Troo And Bring Back an It-Kutch a Preep and a Proo A Nerkle, a Nerd and a Seersucker, too!"

To learn to speak C#, you will need to create some simple applications. To avoid overloading you with too much information too soon, the first few chapters of this book will use the simplest type of application: a console application.

This chapter covers the following topics:

  • Understanding C# basics
  • Declaring variables
  • Building console applications
  • Operating on variables

Understanding C# basics

Let's start with looking at the basics of the grammar and vocabulary of C#. In this chapter, you will create multiple console applications, each showing a feature of the C# language.

To manage these projects with Visual Studio 2017, we will put them all in a single solution. Visual Studio 2017 can only have one solution open at any one time, but each solution can group together multiple projects. A project can build a console application, a Windows desktop application, a web application, and dozens of others.

To manage these projects with Visual Studio Code, which does not support solutions, we will manually create a container folder named Chapter02. If you would like to use Visual Studio Code, skip to the section titled Using Visual Studio Code on macOS, Linux, or Windows.

Using Visual Studio 2017

Start Microsoft Visual Studio 2017. In Visual Studio, press Ctrl + Shift + N or choose the File | New | Project... menu.

In the New Project dialog, in the Installed...

Declaring variables

All applications process data. Data comes in, data is processed, and data goes out.

Data usually comes into our program from files, databases, or user input. Data can be put temporarily in variables that will be stored in the memory of the running program. When the program ends, the data in memory is lost. Data is usually output to files and databases, or to the screen or a printer.

When using variables, you should think about, first, how much space it takes in memory, and, second, how fast it can be processed.

We control this by picking an appropriate type. You can think of simple common types such as int and double as being different size storage boxes. A smaller box would take less memory but may not be as fast at being processed. Some of these boxes may be stacked close by, and some may be thrown into a big heap further away.

Naming variables

There are naming conventions for variables, and it is good practice to follow them, as shown in the following table:

Naming convention...

Building console applications

Console applications are text-based and are run at the command prompt. They typically perform simple tasks that need to be scripted, such as compiling a file or encrypting a section of a configuration file. They can have arguments passed to them to control their behavior for example, to encrypt the database connection strings section in a Web.config file, use the following command line:

aspnet_regiis -pdf "connectionStrings" "c:\mywebsite"

Displaying output to the user

The two most common tasks that a console application performs are writing and reading data. We have already been using the WriteLine method to output. If we didn't want a carriage return at the end of lines, we could have used the Write method.

C# 6 and later has a handy feature named string interpolation. This allows us to easily output one or more variables in a nicely formatted manner. A string prefixed with $ can use curly braces around the name of a variable to output...

Operating on variables

Operators apply simple operations such as addition and multiplication to operands such as numbers. They usually return a new value that is the result of the operation.

Most operators are binary, meaning that they work on two operands, as shown in the following pseudocode:

    var resultOfOperation = FirstOperand operator SecondOperand;

Some operators are unary, meaning they work on a single operand.

A ternary operator works on three operands.

Experimenting with unary operators

Two common unary operators are used to increment ++ and decrement -- a number.

In Visual Studio 2017, from the View menu, choose Other Windows, and then C# Interactive.

Note

In Visual Studio Code, create a new console application and write your own statements to output the results using Console.WriteLine().

Enter the following code:

> int i = 3;
> i
3

Note that when you enter a full statement ending in a semicolon, it is executed when you press Enter.

The first statement uses the assignment operator...

Understanding C# basics

Let's start with looking at the basics of the grammar and vocabulary of C#. In this chapter, you will create multiple console applications, each showing a feature of the C# language.

To manage these projects with Visual Studio 2017, we will put them all in a single solution. Visual Studio 2017 can only have one solution open at any one time, but each solution can group together multiple projects. A project can build a console application, a Windows desktop application, a web application, and dozens of others.

To manage these projects with Visual Studio Code, which does not support solutions, we will manually create a container folder named Chapter02. If you would like to use Visual Studio Code, skip to the section titled Using Visual Studio Code on macOS, Linux, or Windows.

Using Visual Studio 2017

Start Microsoft Visual Studio 2017. In Visual Studio, press Ctrl + Shift + N or choose the File | New | Project... menu.

In the New Project dialog, in the Installed | Templates...

Declaring variables

All applications process data. Data comes in, data is processed, and data goes out.

Data usually comes into our program from files, databases, or user input. Data can be put temporarily in variables that will be stored in the memory of the running program. When the program ends, the data in memory is lost. Data is usually output to files and databases, or to the screen or a printer.

When using variables, you should think about, first, how much space it takes in memory, and, second, how fast it can be processed.

We control this by picking an appropriate type. You can think of simple common types such as int and double as being different size storage boxes. A smaller box would take less memory but may not be as fast at being processed. Some of these boxes may be stacked close by, and some may be thrown into a big heap further away.

Naming variables

There are naming conventions for variables, and it is good practice to follow them, as shown in the following table:

Naming convention...

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Page 1 of 7

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Key benefits

  • Build modern, cross-platform applications with .NET Core
  • Get up to speed with C#, and up to date with all the latest features of C# 7
  • Start creating professional web applications with ASP.NET Core

Description

If you want to build powerful cross-platform applications with C# 7 and .NET Core, then this book is for you. First, we’ll run you through the basics of C#, as well as object-oriented programming, before taking a quick tour through the latest features of C# 7 such as tuples, pattern matching, out variables, and so on. After quickly taking you through C# and how .NET works, we’ll dive into the .NET Standard 1.6 class libraries, covering topics such as performance, monitoring, debugging, serialization and encryption. The final section will demonstrate the major types of application that you can build and deploy cross-device and cross-platform. In this section, we’ll cover Universal Windows Platform (UWP) apps, web applications, mobile apps, and web services. Lastly, we’ll look at how you can package and deploy your applications so that they can be hosted on all of today’s most popular platforms, including Linux and Docker. By the end of the book, you’ll be armed with all the knowledge you need to build modern, cross-platform applications using C# and .NET Core.

Who is this book for?

This book is targeted towards readers who have some prior programming experience or have a science, technology, engineering, or mathematics (STEM) background, and want to gain a solid foundation with C# and to be introduced to the types of applications they could build and will work cross-platform on Windows, Linux, and macOS.

What you will learn

  • • Build cross-platform applications using C# 7 and .NET Core
  • • Explore ASP.NET Core and learn how to create professional web applications
  • • Improve your application's performance using multitasking
  • • Use Entity Framework Core and find out how to build code-first databases
  • • Master object-oriented programming with C# to increase code reuse and efficiency
  • • Familiarize yourself with cross-device app development using the Universal Windows Platform and XAML
  • • Query and manipulate data using LINQ
  • • Protect your data by using encryption and hashing

Product Details

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Publication date : Mar 24, 2017
Length: 594 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787120266
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Category :
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Publication date : Mar 24, 2017
Length: 594 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787120266
Vendor :
Microsoft
Category :
Programming
Languages :
C#
Concepts :
Programming Language
Tools :
.NET Core

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Table of Contents

17 Chapters
1. Hello, C#! Welcome, .NET Core! Chevron down icon Chevron up icon
1. Hello, C#! Welcome, .NET Core!
Choosing your development environment
Installing Microsoft Visual Studio 2017 for Windows
Installing Microsoft Visual Studio Code for Windows, macOS, or Linux
Understanding .NET
Writing and compiling code using the .NET Core CLI tool
Writing and compiling code using Microsoft Visual Studio 2017
Writing and compiling code using Microsoft Visual Studio Code
Managing source code with GitHub
Practicing and exploring
Summary
2. Speaking C# Chevron down icon Chevron up icon
2. Speaking C#
Understanding C# basics
Declaring variables
Building console applications
Operating on variables
Practicing and exploring
Summary
3. Controlling the Flow, Converting Types, and Handling Exceptions Chevron down icon Chevron up icon
3. Controlling the Flow, Converting Types, and Handling Exceptions
Selection statements
Iteration statements
Casting and converting between types
Handling exceptions
Checking for overflow
Looking for help
Practice and explore
Summary
4. Using .NET Standard Types Chevron down icon Chevron up icon
4. Using .NET Standard Types
Using assemblies and namespaces
Storing and manipulating text
Storing data with collections
Internationalizing an application
Practicing and exploring
Summary
5. Debugging, Monitoring, and Testing Chevron down icon Chevron up icon
5. Debugging, Monitoring, and Testing
Debugging tools
Monitoring performance and resource usage
Unit testing an application
Practicing and exploring
Summary
6. Building Your Own Types with Object-Oriented Programming Chevron down icon Chevron up icon
6. Building Your Own Types with Object-Oriented Programming
Talking about OOP
Building class libraries
Storing data with fields
Writing and calling methods
Controlling how parameters are passed
Splitting classes using partial
Controlling access with properties and indexers
Practicing and exploring
Summary
7. Implementing Interfaces and Inheriting Classes Chevron down icon Chevron up icon
7. Implementing Interfaces and Inheriting Classes
Setting up a class library and console application
Simplifying methods with operators
Defining local functions
Raising and handling events
Implementing interfaces
Managing memory with reference and value types
Inheriting from classes
Casting within inheritance hierarchies
Inheriting and extending .NET types
Practice and explore
Summary
8. Working with Databases Using the Entity Framework Core Chevron down icon Chevron up icon
8. Working with Databases Using the Entity Framework Core
Relational Database Management Systems
Using Microsoft SQL Server on Windows
Using SQLite on macOS and mobile platforms
Connecting to the database
Setting up Entity Framework Core
Querying an EF Core model
Manipulating data with EF Core
Practicing and exploring
Summary
9. Querying and Manipulating Data with LINQ Chevron down icon Chevron up icon
9. Querying and Manipulating Data with LINQ
Writing LINQ queries
Working with sets
Projecting entities with Select
Sweetening the syntax with syntactic sugar
Using multiple threads with parallel LINQ
Creating your own LINQ extension methods
Working with LINQ to XML
Practicing and exploring
Summary
10. Working with Files, Streams, and Serialization Chevron down icon Chevron up icon
10. Working with Files, Streams, and Serialization
Managing the filesystem
Reading and writing with streams
Encoding text
Serializing object graphs
Practice and explore
Summary
11. Protecting Your Data Chevron down icon Chevron up icon
11. Protecting Your Data
Understanding the vocabulary of protection
Encrypting and decrypting data
Hashing data
Signing data
Practicing and exploring
Summary
12. Improving Performance and Scalability with Multitasking Chevron down icon Chevron up icon
12. Improving Performance and Scalability with Multitasking
Understanding processes, threads, and tasks
Running tasks asynchronously
Synchronizing access to shared resources
Implementing multitasking for a GUI
Practicing and exploring
Summary
13. Building Universal Windows Platform Apps Using XAML Chevron down icon Chevron up icon
13. Building Universal Windows Platform Apps Using XAML
Understanding Universal Windows Platform
Understanding XAML
Creating an app for Universal Windows Platform
Using resources and templates
Data binding
Animating with storyboards
Testing in emulators
Practicing and exploring
Summary
14. Building Web Applications Using ASP.NET Core MVC Chevron down icon Chevron up icon
14. Building Web Applications Using ASP.NET Core MVC
Understanding ASP.NET Core
Exploring an ASP.NET Core MVC web application
ASP.NET Core MVC controllers
ASP.NET Core MVC models
ASP.NET Core MVC views
Taking ASP.NET Core MVC further
Practicing and exploring
Summary
15. Building Mobile Apps Using Xamarin.Forms and ASP.NET Core Web API Chevron down icon Chevron up icon
15. Building Mobile Apps Using Xamarin.Forms and ASP.NET Core Web API
Understanding Xamarin.Forms
Building services using ASP.NET Core Web API and Visual Studio Code
Building mobile apps using Xamarin.Forms and Visual Studio for Mac
Practicing and exploring
Summary
16. Packaging and Deploying Your Code Cross-Platform Chevron down icon Chevron up icon
16. Packaging and Deploying Your Code Cross-Platform
Porting to .NET Core
Sharing code cross-platform with .NET Standard class libraries
Understanding NuGet packages
Publishing your applications
Deploying to the cloud
Developing on and for Linux
Practicing and exploring
Summary
A. Answers to the Test Your Knowledge Questions Chevron down icon Chevron up icon
A. Answers to the Test Your Knowledge Questions
Chapter 1 - Hello, C#! Welcome, .NET Core!
Chapter 2 - Speaking C#
Chapter 3 - Controlling the Flow, Converting Types, and Handling Exceptions
Chapter 4 - Using .NET Standard Types
Chapter 5 - Debugging, Monitoring, and Testing
Chapter 6 - Building Your Own Types with Object-Oriented Programming
Chapter 7 - Implementing Interfaces and Inheriting Classes
Chapter 8 - Working with Databases Using Entity Framework Core
Chapter 9 - Querying and Manipulating Data with LINQ
Chapter 10 - Working with Files, Streams, and Serialization
Chapter 11 - Protecting Your Data
Chapter 12 - Improving Performance and Scalability with Multitasking
Chapter 13 - Building Universal Windows Platform Apps Using XAML
Chapter 14 - Building Web Applications Using ASP.NET Core MVC
Chapter 15 - Building Mobile Apps Using Xamarin.Forms and ASP.NET Core Web API
Chapter 16 - Packaging and Deploying Your Code Cross-Platform

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Frank Semeraro Sep 05, 2017
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Excellent reference. Very well written.
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Hawkeyedriver Nov 07, 2017
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I use this as a textbook now!
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very good
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MC May 19, 2017
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I like his style! Just started reading, but he gets down to business in a conversational education process.
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Great book from a great writer. Coming from an PHP / Open Source background, I'd alway been a little bit sceptcial of ASP.net, but the strides MS are making in opening in up the environment and making it multi-platform, really piqued my interest. Had a bit of experience with C#, but this took me further and I'm now starting to get to the point where I'm going to create my next web app in .NetCore.The book assumes no real knowledge of C#, but covers the basics. I skipped most of that and dug in to the more meaty bits (starting with custom events / delegates). All my questions were answered, due to the clarity of explanations.I programmed most of the examples using a Mac and then added my files to OneDrive, so that I could continue on my PC. Happy reading.
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Please Note: Packt eBooks are non-returnable and non-refundable.

Packt eBook and Licensing When you buy an eBook from Packt Publishing, completing your purchase means you accept the terms of our licence agreement. Please read the full text of the agreement. In it we have tried to balance the need for the ebook to be usable for you the reader with our needs to protect the rights of us as Publishers and of our authors. In summary, the agreement says:

  • You may make copies of your eBook for your own use onto any machine
  • You may not pass copies of the eBook on to anyone else
How can I make a purchase on your website? Chevron down icon Chevron up icon

If you want to purchase a video course, eBook or Bundle (Print+eBook) please follow below steps:

  1. Register on our website using your email address and the password.
  2. Search for the title by name or ISBN using the search option.
  3. Select the title you want to purchase.
  4. Choose the format you wish to purchase the title in; if you order the Print Book, you get a free eBook copy of the same title. 
  5. Proceed with the checkout process (payment to be made using Credit Card, Debit Cart, or PayPal)
Where can I access support around an eBook? Chevron down icon Chevron up icon
  • If you experience a problem with using or installing Adobe Reader, the contact Adobe directly.
  • To view the errata for the book, see www.packtpub.com/support and view the pages for the title you have.
  • To view your account details or to download a new copy of the book go to www.packtpub.com/account
  • To contact us directly if a problem is not resolved, use www.packtpub.com/contact-us
What eBook formats do Packt support? Chevron down icon Chevron up icon

Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.