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POHow to limit subclassing of public abstact class to types in same assembly and thus allow protected members typed to internal types
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  1. POHow to limit subclassing of public abstact class to types in same assembly and thus allow protected members typed to internal types
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    copied!<p>This question is similar to <strong>c# internal abstract class, how to hide usage outside</strong> but my motiviation is different. Here is the scenario</p> <p>I started with the following:</p> <pre><code>internal class InternalTypeA {...} public class PublicClass { private readonly InternalTypeA _fieldA; ... } </code></pre> <p>The above compiles fine. But then I decided that I should extract a base class and tried to write the following:</p> <pre><code>public abstract class PublicBaseClass { protected readonly InternalTypeA _fieldA; ... } </code></pre> <p>And thus the problem, the protected member is visible outside the assembly but is of an internal type, so it won't compile.</p> <p>The issue at hand is how to I (or can I?) tell the compiler that only public classes in the same assembly as PublicBaseClass may inherit from it and therefore _fieldA will not be expossed outside of the assembly?</p> <p>Or is there another way to do what I want to do, have a public super class and a set of public base classes that are all in the same assembly and use internal types from that assembly in their common ("protected") code?</p> <p>The only idea I have had so far is the following:</p> <pre><code>public abstract class PublicBaseClass { private readonly InternalTypeA _fieldA; protected object FieldA { get { return _fieldA; } } ... } public class SubClass1 : PublicBaseClass { private InternalTypeA _fieldA { get { return (InternalTypeA)FieldA; } } } public class SubClass2 : PublicBaseClass { private InternalTypeA _fieldA { get { return (InternalTypeA)FieldA; } } } </code></pre> <p>But that is UGLY!</p>
 

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