What are the two required parts of LINQ?
A LINQ provider and the LINQ extension methods. You must import the
System.Linqnamespace to make the LINQ extension methods available and reference a LINQ provider assembly for the type of data that you want to work with.
Which LINQ extension method would you use to return a subset of properties from a type?
The
Selectmethod allows projection (selection) of properties.
Which LINQ extension method would you use to filter a sequence?
The
Wheremethod allows filtering by supplying a delegate (or lambda expression) that returns a Boolean to indicate whether the value should be included in the results.List five LINQ extension methods that perform aggregation.
Max,Min,Count,Average,Sum, andAggregate.
What is the difference between the Select and
SelectManyextension methods?Select returns exactly what you specify to return.
SelectManychecks that the items you have selected are themselvesIEnumerable<T>and then breaks them down into smaller parts. For example, if the type you select is a string value (which isIEnumerable<char>),SelectManywill break each string value returned into their individualcharvalues.
C# 7 and .NET Core: Modern Cross-Platform Development - Second Edition
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.
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Current Title:
C# 7 and .NET Core: Modern Cross-Platform Development - Second Edition
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
Free Chapter
Hello, C#! Welcome, .NET Core!
Speaking C#
Controlling the Flow, Converting Types, and Handling Exceptions
Using .NET Standard Types
Debugging, Monitoring, and Testing
Building Your Own Types with Object-Oriented Programming
Implementing Interfaces and Inheriting Classes
Working with Databases Using the Entity Framework Core
Querying and Manipulating Data with LINQ
Working with Files, Streams, and Serialization
Protecting Your Data
Improving Performance and Scalability with Multitasking
Building Universal Windows Platform Apps Using XAML
Building Web Applications Using ASP.NET Core MVC
Building Mobile Apps Using Xamarin.Forms and ASP.NET Core Web API
Packaging and Deploying Your Code Cross-Platform
Answers to the Test Your Knowledge Questions
Customer Reviews