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StackOverflow C# question: Slight confusion over reference types and value types in the C# spec

Posted by jpluimers on 2011/06/23

Recently there was a nice Slight confusion over reference types and value types in the C# spec on StackOverflow.


When structs are value types, but interfaces are reference types, how can a struct implement an interface and still be a value type?

The answer is boxing: when a reference to a struct is needed, a reference object is automatically created, and the value of the struct is box-wrapped into it.

This automatic boxing is really nice, but be aware that when frequently doing this, it can have a huge performance impact.

Thanks Abhina Basu for blogging about boxing structs having interfaces, and the many volunteers on StackOverflow explaining about boxing.


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