LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria

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LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria

[ForumBot]

Whenever you use [`SingleOrDefault`](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.singleordefault), you clearly state that the query should result in at most a *single* result. On the other hand, when [`FirstOrDefault`](https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.firstordefault) is used, the query can return any amount of results but you state that you only want the first one.

I personally find the semantics very different and using the appropriate one, depending on the expected results, improves readability.