Master the Design of Classes (Part 2)
Watch the long video: • Master the Design of Classes
Marker interfaces are generally considered a bad design in C#.
You will often hear that it is better to mark a class with a custom attribute than to tag it with a marker interface.
That is generally good advice, except when it is not.
In this domain, I want to constrain the legal repository types.
The repository of books is legal.
The repository of book releases is not because a release cannot exist without the book.
How shall we go around it?
Watch the full video for details about designing this domain model.
Regarding repositories, an effective design is to constrain them only to accept entity types marked as aggregate roots.
The book is the aggregate root, and so it is allowed.
The book release is a weak object, so its repository will not compile.
You cannot accomplish this with a custom attribute in C#.
Attributes cannot constrain generic types.
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👨 About Me 👨
Hi, I’m Zoran, I have more than 20 years of experience as a software developer, architect, team lead, and more. I have been programming in C# since its inception in the early 2000s. Since 2017 I have started publishing professional video courses at Pluralsight and Udemy and by this point, there are over 100 hours of the highest-quality videos you can watch on those platforms. On my YouTube channel, you can find shorter video forms focused on clarifying practical issues in coding, design, and architecture of .NET applications.❤️
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