Book Image

C# 12 and .NET 8 – Modern Cross-Platform Development Fundamentals - Eighth Edition

By : Mark J. Price
4.6 (14)
Book Image

C# 12 and .NET 8 – Modern Cross-Platform Development Fundamentals - Eighth Edition

4.6 (14)
By: Mark J. Price

Overview of this book

This latest edition of the bestselling Packt series will give you a solid foundation to start building projects using modern C# and .NET with confidence. You'll learn about object-oriented programming; writing, testing, and debugging functions; and implementing interfaces. You'll take on .NET APIs for managing and querying data, working with the fi lesystem, and serialization. As you progress, you'll explore examples of cross-platform projects you can build and deploy, such as websites and services using ASP.NET Core. This latest edition integrates .NET 8 enhancements into its examples: type aliasing and primary constructors for concise and expressive code. You'll handle errors robustly through the new built-in guard clauses and explore a simplified implementation of caching in ASP.NET Core 8. If that's not enough, you'll also see how native ahead-of-time (AOT) compiler publish lets web services reduce memory use and run faster. You'll work with the seamless new HTTP editor in Visual Studio 2022 to enhance the testing and debugging process. You'll even get introduced to Blazor Full Stack with its new unified hosting model for unparalleled web development flexibility.
Table of Contents (18 chapters)
17
Index

Modifying data with EF Core

Inserting, updating, and deleting entities using EF Core is an easy task to accomplish. This is often referred to as CRUD, an acronym that includes the following operations:

  • C for Create
  • R for Retrieve (or Read)
  • U for Update
  • D for Delete

By default, DbContext maintains change tracking automatically, so the local entities can have multiple changes tracked, including adding new entities, modifying existing entities, and removing entities.When you are ready to send those changes to the underlying database, call the SaveChanges method. The number of entities successfully changed will be returned.

Inserting entities

Let's start by looking at how to add a new row to a table:

  1. In the WorkingWithEFCore project, add a new class file named Program.Modifications.cs.
  2. In Program.Modifications.cs, create a partial Program class with a method named ListProducts that outputs the ID, name, cost, stock, and discontinued properties of each product, sorted with the costliest...