Book Image

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

Book Image

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

Overview of this book

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.
Table of Contents (24 chapters)
C# 7 and .NET Core: Modern Cross-Platform Development - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Querying an EF Core model


Open the Program.cs file and import the following namespaces:

    using static System.Console; 
    using Packt.CS7; 
    using Microsoft.EntityFrameworkCore; 
    using System.Linq; 

In the Main method, add the following statements to:

  • Create an instance of the Northwind class that will manage the database

  • Create a query for all categories that includes their related products

  • Enumerates through the categories, outputting the name and number of products for each one

  • Prompt the user for a price for products

  • Create a query for products that cost more than the price by using LINQ

  • Loop through the results

    using(var db = new Northwind()) 
    { 
      WriteLine("List of categories and the number of products:"); 
 
      IQueryable<Category> cats =  
        db.Categories.Include(c => c.Products); 
 
      foreach(Category c in cats) 
      { 
        WriteLine( 
          $"{c.CategoryName} has...