Book Image

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

By : Mark J. Price
Book Image

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

By: Mark J. Price

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)
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
Index

Working with LINQ to XML


LINQ to XML is a LINQ provider that allows you to query and manipulate XML.

Generating XML using LINQ to XML

Open the console application project or folder named LinqWithEFCore.

In the Program.cs file, import the System.Xml.Linq namespace.

In the Main method, at the bottom, write the following statements:

var productsForXml = db.Products.ToArray(); 
 
var xml = new XElement("products", 
    from p in productsForXml 
    select new XElement("product", 
    new XAttribute("id", p.ProductID), 
    new XAttribute("price", p.UnitPrice), 
    new XElement("name", p.ProductName))); 
 
WriteLine(xml.ToString());

Run the console application and view the output.

Note the structure of the XML generated matches the elements and attributes that the LINQ to XML statement declaratively described in the preceding code:

<products> 
  <product id="1" price="18.0000"> 
    <name>Chai</name> 
  </product> 
  <product id="2" price="19.0000"> 
    <name...