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Editorial Team
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Asked: 2026-05-23T09:54:47+00:00

In my C# code I want a CustomIdentity class that inherits from System.MarshalByRefObject and

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In my C# code I want a CustomIdentity class that inherits from System.MarshalByRefObject and System.Security.Principal.GenericIndentity classes.

However when I try to write such inheritance C# would object with CS1721 error saying I can’t directly inherit from more than one class.

Now in this case it’s quite easy to overcome this – I’ll inherit from IIdentity, add GenericIdentity member variable and reimplement all IIdentity methods via that member variable.

But how would I do in case I wanted to inherit from two classes with a huge set of methods?

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1 Answer

  1. Editorial Team

    You don’t. You can’t.

    That is not supported in C# or .NET.

    You use multiple interface implementation, and at most single (non-object) inheritance. In most cases, even single inheritance is vastly overused ;p

    To absorb the methods, you’d have to use some kind of encapsulation. Extension methods also provide a way to share methods between types, for completeness.

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