Why is Void a structure?

I realized that in the Microsoft .NET Framework the void return type is a structure. Why?

public void TestMethod()



The framework uses a value type called System.Void to represent the void return type keyword for use with reflection. Although void means the lack of a return value, it's still technically a type, and in order for it to be expressed as such in code it has to be either a structure (value type) or a class (reference type).

See MethodInfo.ReturnType for an example.

As to why the framework designers chose to make System.Void a structure and not a class is anybody's guess, but it has to be represented by a type in the first place. I'd agree with the comments that it's to avoid the unnecessary overhead typically associated with reference lookups, among other optimizations.

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