Uploaded April 2024 | Updated September 2026, 2 weeks ago
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When a model defines a non-nullable reference, you expect it never to be null, right?
The constructor would ensure null never passes through.
An attempt to initialize it with anything that can evaluate to null would raise the warning.
Is this right?
The problem is that we rarely instantiate models directly.
More often than not, the data comes in the form of a helper object, sometimes a DTO.
And DTOs often result from deserialization and other automated processes that turn missing data into nulls.
If we just created a model from this DTO, a null would sneak into it!
DTOs belong to the outer layers, and the solution is to define a conversion to a model.
That is the place to add any checks and validations before actually instantiating a model.
The model would then remain free of null checks. The compiler would do them for us.
Watch the full video and learn more.
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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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⚡️COPYRIGHT NOTICE:
The Copyright Laws of the United States recognize a “fair use” of copyrighted content. Section 107 of the U.S. Copyright Act states: “Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phono records or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright." This video and our youtube channel, in general, may contain certain copyrighted works that were not specifically authorized to be used by the copyright holder(s), but which we believe in good faith are protected by federal law and the Fair use doctrine for one or more of the reasons noted above.
#csharp #dotnet #objectorientedprogramming
Subscribe ► youtube.com/channel/UCxsWfh8LCcn55mFB6zGBT1g?sub_confirmation=1
Become a sponsor ► patreon.com/zoranhorvat
Join Discord server with topics on C# ► codinghelmet.com/go/discord
Enroll course *Beginning Object-Oriented Programming with C#* ► codinghelmet.com/go/beginning-oop-with-csharp
When a model defines a non-nullable reference, you expect it never to be null, right?
The constructor would ensure null never passes through.
An attempt to initialize it with anything that can evaluate to null would raise the warning.
Is this right?
The problem is that we rarely instantiate models directly.
More often than not, the data comes in the form of a helper object, sometimes a DTO.
And DTOs often result from deserialization and other automated processes that turn missing data into nulls.
If we just created a model from this DTO, a null would sneak into it!
DTOs belong to the outer layers, and the solution is to define a conversion to a model.
That is the place to add any checks and validations before actually instantiating a model.
The model would then remain free of null checks. The compiler would do them for us.
Watch the full video and learn more.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
👨 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.❤️
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
⚡️COPYRIGHT NOTICE:
The Copyright Laws of the United States recognize a “fair use” of copyrighted content. Section 107 of the U.S. Copyright Act states: “Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phono records or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright." This video and our youtube channel, in general, may contain certain copyrighted works that were not specifically authorized to be used by the copyright holder(s), but which we believe in good faith are protected by federal law and the Fair use doctrine for one or more of the reasons noted above.
#csharp #dotnet #objectorientedprogramming
