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Home/ Questions/Q 178409
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Asked: May 11, 20262026-05-11T14:13:34+00:00 2026-05-11T14:13:34+00:00

I just don’t get it as it would be so useful to convert one

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I just don’t get it as it would be so useful to convert one generic container into the other?

Stack <IType> stack = new Stack<SomeType>(); 
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  1. 2026-05-11T14:13:35+00:00Added an answer on May 11, 2026 at 2:13 pm

    Are you talking about conversions like so?

    IFoo<Child> child = ...; IFoo<Parent> parent = child; 

    If so, this is what is known as covariance. This is usually paired with it’s counterpart contravariant. This feature is indeed not available in the current version of C#. But it will be available in next version of both C# and VB.Net.

    Some articles about the upcoming release

    • http://blogs.msdn.com/ericlippert/archive/2007/10/16/covariance-and-contravariance-in-c-part-one.aspx
    • http://www.leading-edge-dev.de/?p=246
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