Book Image

C# 9 and .NET 5 – Modern Cross-Platform Development - Fifth Edition

By : Mark J. Price
Book Image

C# 9 and .NET 5 – Modern Cross-Platform Development - Fifth Edition

By: Mark J. Price

Overview of this book

In C# 9 and .NET 5 – Modern Cross-Platform Development, Fifth Edition, expert teacher Mark J. Price gives you everything you need to start programming C# applications. This latest edition uses the popular Visual Studio Code editor to work across all major operating systems. It is fully updated and expanded with a new chapter on the Microsoft Blazor framework. The book’s first part teaches the fundamentals of C#, including object-oriented programming and new C# 9 features such as top-level programs, target-typed new object instantiation, and immutable types using the record keyword. Part 2 covers the .NET APIs, for performing tasks like managing and querying data, monitoring and improving performance, and working with the file system, async streams, serialization, and encryption. Part 3 provides examples of cross-platform apps you can build and deploy, such as websites and services using ASP.NET Core or mobile apps using Xamarin.Forms. The best type of application for learning the C# language constructs and many of the .NET libraries is one that does not distract with unnecessary application code. For that reason, the C# and .NET topics covered in Chapters 1 to 13 feature console applications. In Chapters 14 to 20, having mastered the basics of the language and libraries, you will build practical applications using ASP.NET Core, Model-View-Controller (MVC), and Blazor. By the end of the book, you will have acquired the understanding and skills you need to use C# 9 and .NET 5 to create websites, services, and mobile apps.
Table of Contents (23 chapters)

Making product recommendations

The practical application of machine learning we will implement is making product recommendations on an e-commerce website, with the goal being to increase the value of a customer order.

The problem is how to decide what products to recommend to the visitor.

Problem analysis

On October 2, 2006, Netflix started an open prize challenge for the best algorithm for predicting customer ratings for films based only on previous ratings. The dataset that Netflix provided had 17,000 movies, 500,000 users, and 100 million ratings. For example, user 437822 gives movie 12934 a rating of 4 out of 5.

Singular Value Decomposition (SVD) is a decomposition method for reducing a matrix to make later calculations simpler, and Simon Funk shared with the community how he and his team used it to get near the top of the rankings during the competition.

More Information: You can read more about Simon Funk's use of SVD at the following link: https...