Скачать или смотреть C# LINQ: First() vs FirstOrDefault() vs Single() vs SingleOrDefault() – Use Case

Stop guessing! Are you using the correct LINQ method? Misusing First(), FirstOrDefault(), Single(), or SingleOrDefault() is one of the most common causes of runtime exceptions and subtle bugs in C# applications, especially when working with Entity Framework Core.
In this ultimate C# LINQ guide, we break down the critical semantic differences, performance implications, and best practices for when to use each method. You'll learn exactly how to decide between them based on your business logic and expectations for the data.

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