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C# 7.1 and .NET Core 2.0 - Modern Cross-Platform Development

C# 7.1 and .NET Core 2.0 - Modern Cross-Platform Development - Third Edition

By : Mark J. Price, Dustin Heffron, Efraim Kyriakidis
4.1 (16)
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C# 7.1 and .NET Core 2.0 - Modern Cross-Platform Development

C# 7.1 and .NET Core 2.0 - Modern Cross-Platform Development

4.1 (16)
By: Mark J. Price, Dustin Heffron, Efraim Kyriakidis

Overview of this book

C# 7.1 and .NET Core 2.0 – Modern Cross-Platform Development, Third Edition, is a practical guide to creating powerful cross-platform applications with C# 7.1 and .NET Core 2.0. It gives readers of any experience level a solid foundation in C# and .NET. The first part of the book runs you through the basics of C#, as well as debugging functions and object-oriented programming, before taking a quick tour through the latest features of C# 7.1 such as default literals, tuples, inferred tuple names, pattern matching, out variables, and more. After quickly taking you through C# and how .NET works, this book dives into the .NET Standard 2.0 class libraries, covering topics such as packaging and deploying your own libraries, and using common libraries for working with collections, performance, monitoring, serialization, files, databases, and encryption. The final section of the book demonstrates the major types of application that you can build and deploy cross-device and cross-platform. In this section, you'll learn about websites, web applications, web services, Universal Windows Platform (UWP) apps, and mobile apps. 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.
Table of Contents (31 chapters)
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Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
2
Part 1 – C# 7.1
8
Part 2 – .NET Core 2.0 and .NET Standard 2.0
16
Part 3 – App Models
22
Summary
1
Index

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 Program, define a QueryingCategories method, and add the following statements to do these:

  • Create an instance of the Northwind class that will manage the database
  • Create a query for all categories that includes their related products
  • Enumerate through the categories, outputting the name and number of products for each one:
static void QueryingCategories()
{ 
   using (var db = new Northwind()) 
   { 
      WriteLine("Categories and how many products they have:"); 
 
      // a query to get all categories and their related products
      IQueryable<Category> cats = db.Categories.Include(c => c.Products); 
 
      foreach (Category c in cats) 
      { 
         WriteLine($"{c.CategoryName} has {c.Products.Count} products."); 
      } 
   }
}

Note

You will learn much more about writing LINQ queries...

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