Book Image

.NET Standard 2.0 Cookbook

By : Fiqri Ismail
Book Image

.NET Standard 2.0 Cookbook

By: Fiqri Ismail

Overview of this book

The .NET Standard is a standard that represents a set of APIs that all .NET platforms have to implement, making it easy for developers to access and use one common library for their development needs. This book begins with a quick refresher, helping you understand the mechanics of the new standard and offering insight into how it works. You’ll explore the core library concepts, such as working with collections, configurations, I/O, security, and multithreading. You’ll explore the iOS and Android libraries of Xamarin and we’ll guide you through creating a .NET Standard 2.0 library, which you’ll use with both Android and iOS applications. In the final chapters, you’ll learn the various debugging and diagnostics tools to deliver quality libraries and create a NuGet package of the .NET Standard 2.0 library. By the end of this book, you’ll be able to expand your current workflow to various .NET flavors and have the essential skills to create a .NET Standard 2.0 library from scratch to package and deliver it to the world.

Related Content you might be interested in

Current Title:

Small book image
.NET Standard 2.0 Cookbook
Fiqri Ismail
May, 2018 | 394 pages
Small book image
C# 7 and .NET Core: Modern Cross-Platform Development
Mark Price
Mar, 2017 | 594 pages
Small book image
Mastering Visual Studio 2019
Kunal Chowdhury
Aug, 2019 | 374 pages
Table of Contents (18 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
Packt Upsell
Packt Upsell
Contributors
Contributors
Preface
Preface
Free Chapter
1
Back to Basics
Back to Basics
Technical requirements
Introduction 
Creating a C#-based console application
Creating a C# class library 
Creating a classic Windows-based application to use the library
Creating a WPF-based application to use the library 
Hello Universe – My first .NET Standard class library
Creating a Windows console-based application to use the library
Creating an ASP.NET Core-based web application to use the library
2
Primitives, Collections, LINQ, and More
Primitives, Collections, LINQ, and More
Technical requirements
Introduction
Building a .NET Standard 2.0 library that uses primitives
A .NET console application to use the library
Creating collections
A WPF application to use the library
Describing our library with Reflections
A .NET Core console application to use the library
Building a .NET Standard 2.0 library that uses LINQ
An ASP.NET MVC application to use the library
3
Working with Files
Working with Files
Technical requirements
Introduction
Setting up .NET Core in Ubuntu
Creating a log as text
Creating an ASP.NET Core application in Ubuntu to use the library
Setting up .NET Core in macOS
Reading from a comma separated (CSV) text file
Creating a .NET Core console application in macOS to use the library
Compressing? Why not?
Creating a classic Windows application to use the library
Encrypting and decrypting content in a text file
Creating a classic Windows application to use the library
4
Functional Programming
Functional Programming
Technical requirements
Introduction
Creating a .NET Standard 2.0 library
Creating a .NET Core console application to use the library
Creating a .NET Standard 2.0 library that uses tuples
Creating a Razor Pages web application to use the library
Creating a .NET Standard 2.0 library that uses delegates and lambda expressions
Creating a .NET console application to use the library
5
XML and Data
XML and Data
Technical requirements
Introduction
Creating a library that reads and writes to an XML file
Creating an ASP.NET MVC application to use the XMLLib library
Processing an XML file using LINQ to XML
Creating a .NET Core console application to use the library
6
Exploring Threading
Exploring Threading
Technical requirements
Introduction
Creating a library that can perform several things at once
Creating a .NET Core console application to use the library
Creating an async method with tasks
Creating a WPF application to use the library
Creating a thread pool
Creating a .NET console application to use the library
7
Networking
Networking
Technical requirements
Introduction
A library that displays an IP address and the name using sockets
Creating a classic Windows application to use the library
Creating a library that sends mail
Creating a WPF application to use the library
Creating a library to call a REST API
Creating an ASP.NET MVC application to use the library
8
To iOS with Xamarin
To iOS with Xamarin
Technical requirements
Introduction
Installing Visual Studio for Mac
Hello iOS – Creating a Xamarin iOS app
Creating the .NET Standard 2.0 library
Putting things together and testing the application
9
To Android with Xamarin
To Android with Xamarin
Technical requirements
Introduction
Hello Android – Creating a Xamarin Android app
Adding a .NET Standard 2.0 library to the Xamarin project
Putting things together and testing the application
10
Let’s Fine-Tune Our Library
Let’s Fine-Tune Our Library
Technical requirements
Introduction
A library logs things itself
Creating a .NET Core console application to use the library
Informing the end user – Exception handling and error messages
Using Visual Studio 2017 diagnostics and debugging tools
11
Packaging and Delivery
Packaging and Delivery
Technical requirements
Introduction
Creating a .NET Standard 2.0 library
Creating a NuGet package of your library
Submitting the package to NuGet package manager
Creating a classic Windows application and testing the NuGet package
12
Deploying
Deploying
Technical requirements
Introduction
Creating a free Azure Cloud subscription
Creating an ASP.NET core web application to use the library from NuGet
Deploying the application to Azure Cloud
Index
Index

Creating a Windows console-based application to use the library

We have created a .NET Standard 2.0-based class library in the previous recipe. In this recipe, we will be creating a Windows console-based application to use the library. The console-based application will be using the full .NET Framework under Windows, the current version of .NET Framework  is 4.6.1. 

Getting ready

Let's get ready to create the Windows console application to use the .NET Standard library we have built in the previous recipe. If you haven't followed the previous recipe, make sure you have completed it. We are going to use that solution and add the Windows console application to it. Open Visual Studio 2017 and open the solution we saved from the previous recipe. Click Build | Build Solution, or press Ctrl + Shift + B, and the solution should build successfully. Everything's ready for testing our class library. 

How to do it...

  1. Open Visual Studio 2017.
  2. Now, open the solution from the previous recipe. Click File | Open | Open Project/Solution, or press Ctrl + Shift + O, and select the Chapter1.StandardLib solution. 
  3. Now, click on the Chapter1.Library solution label. Click File | Add | New Project.
  1. In the Add New Project template dialog box, expand the Visual C# node in the left-hand pane. Select Windows Classic Desktop and select Console App (.NET Framework) from the right-hand pane. 
  1. Now, in the Name: text box, type Chapter1.Standard.HelloConsole and leave the Location: text box as it is. 
  1. Click OK.
  2. Now, the Solution Explorer (if not visible, press Ctrl + Alt + L) should look like this: 
  1. In the Chapter1.StandardLib.HelloConsole project tree, right-click on the References label and selectAdd Reference....  
  2. Under the Reference Manager dialog box, click on the Projects label in the left-hand pane. In the middle pane, check the Chapter1.StandardLib.HelloUniverse project. 
  1. Click OK.
  2. In the Solution Explorer, double-click on the Program.cs filename under the Chapter1.StandardLib.HelloConsole project. 
  3. Scroll up till you reach the using directive part of the code and add the following code as the last line of that section:
      using Chapter1.StandardLib;
  1. Now, in between the curly brackets of the Main() method, type the following code: 
      var myName = "Fiqri Ismail";
      var helloMessage = new HelloUniverse();
      Console.WriteLine(helloMessage.SayHello(myName));
      Console.ReadLine();
  1. Hit F5 and see the code running: 
  1. Press Enter to exit from the Command Prompt. 

How it works...

OK, let's dive behind the scenes of the stuff we just completed. From steps 1 to 7, we opened an existing project and added a new Windows console application. This project is a full .NET Framework project and its version is .NET Framework version 4.6.1. In steps 9 and 10, we added the reference to a .NET Standard class library project from the Windows console application. This is required to test the class library. Then, we can reference it and use it from the application, as we did in step 12. 

In step 13, we created a variable to store the name (keep in mind, hardcoding is not a good practice). And then we have created an instance of the HelloUniverse class that we created in the .NET Standard 2.0 class library. To display the output of the SayHello() method to the console window, we have directly used the Console.WriteLine() method. Finally, we waited until the user presses a key to exit from the console by using the Console.ReadLine() method, or else the end user wouldn't be able to see any output in the console. 

Previous Section
End of Section 9
Next Section