Working with Records

Learn about C# 9 features, including init-only properties and records, which enhance immutability and object manipulation capabilities.

We'll cover the following

Init-only properties
- Try it yourself
Understanding records
- Try it yourself

Before we dive into the new records language feature, let us see some other related new features of C# 9 and later.

Init-only properties

We have used object initialization syntax to instantiate objects and set initial properties. Those properties can also be changed after instantiation. Sometimes, we want to treat properties like read-only fields so they can be set during instantiation but not after. The new init keyword enables this. It can be used in place of the set keyword:

Step 1: In the PacktLibraryNetStandard2 project or folder, add a new file named Records.cs.

Step 2: In Records.cs, define a person class with two immutable properties, as shown in the following code:

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Introduction

Hello, C#! Welcome, .NET!

Speaking C#

Controlling Flow, Converting Types, and Handling Exception

Writing, Debugging, and Testing Functions

Building Your Own Types with Object-Oriented Programming

Implementing Interfaces and Inheriting Classes

Packaging and Distributing .NET Types

Working with Common .NET Types

Working with Files, Streams, and Serialization

Working with Data Using Entity Framework Core

Querying and Manipulating Data Using LINQ

Introducing Web Development Using ASP.NET Core

Building Websites Using ASP.NET Core Razor Pages

Building Websites Using the Model-View-Controller Pattern

Building and Consuming Web Services

Building User Interfaces Using Blazor

Conclusion

Working with Records

Init-only properties