In C#, the Lookup class is a dictionary-like data structure that maps keys to a value or collection of values.

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This post explores the Lookup class in C# and discusses its differences from the Dictionary class. It explains how to create a Lookup and provides scenarios where it can be useful.

Lookup in C#

Differences Between a Lookup and a Dictionary in C#

I really miss actual when-to-use scenarios over the generic examples.

I read the article. I can’t think of a single reason not to use an actual dictionary instead.
They even mention dictionaries are more performant. They also mention wanting to map multiple values to a single key. You can do that many different ways with dictionaries.
Even in their example they show that a value for them is essentially an IEnumerable&lt;string&gt;
Why not then just use a Dictionary&lt;string,IEnumerable&lt;string&gt;&gt;?
It’s not rocket science.
This article looks like it’s either A) written by AI or B) written for advertising their books. Or C) both.