Structures in C Sharp

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Why Structures are Sealed by default?

Posted 29-Jul-11 22:14pm

Dev Kashyap

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4 solutions

Solution 3

http://www.csharpfriends.com/articles/getarticle.aspx?articleid=120[^]

The Above Link will guide you clearly.

Posted 1-Aug-11 21:59pm

Asish Limbu

Solution 4

because by default it is sealed No destructor for struct because structures are created in stack memory.

Posted 1-Aug-11 22:32pm

gouri.mahapatra

Solution 2

This problem is not so simple as it may look.

In my opinion, the real reason is some mistaken decisions in .NET architecture. (Actually, I consider the limitation of inheritance in .NET as its biggest problem and the lack of fully-fledged meta-classes (instead, there is a limited System.Type type) as the second biggest problem of .NET). To me, its' hard to explain as Anders Hejlsberg was the chief architect of Delphi.

I cannot accept rationale described by Griff as in some other languages extension of structures and other value types (including primitive types) works wonderfully.

—SA

Posted 1-Aug-11 21:01pm

Sergey Alexandrovich Kryukov

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OriginalGriff · Accepted Answer · 2011-07-29T22:23:00

For the simple reason that you can't derive from any value type: only reference types.

The actual reason for this is complex, and has to do with what happens when you copy a value type: you get a bitwise clone, rather than a reference copy (because you don't have a reference to a value type). So if you could copy a derived struct via it's base type, you would get a base type bitwise copy, rather than a derived type bitwise copy. And now you would have lost information.

If you really feel the need to know, google for "Value slicing" and be prepared to get a small headache! :laugh: