Properties to Be Set During Instantiation and Defining Indexers

Properties to be set during instantiation

C# 11 introduces the required modifier. If we use it on a property or field, the compiler will ensure that we set the property or field to a value when we instantiate it. It requires targeting .NET 7 or later, so we need to create a new class library first:

Step 1: In the Chapter05 solution or workspace, add a new class library project PacktLibraryModern that targets .NET 7.0.

Step 2: In the PacktLibraryModern project, add a new class file named Book.cs.

Step 3: Modify the class to give it four properties with two set as required, as shown in the following code: