Question

How come that in C# you can make Primitive Datatypes?

What kind of practical uses does this functionality have?

Answer 1

I assume you mean struct. There are various uses:

• representing simple data such as a Point or ComplexValue that doesn’t warrant the overhead of an object per instance : it is just a (preferably-immutable) set of values that are a composite
• mapping fields to memory with explicit layout for interop purposes
• avoiding GC issues for massive datasets

It is, however, very rare to declare a struct in C#; i.e. vanishingly rare. Nobody is making you do it, and if you don’t like them : don’t create any.