Is it possible to restrict who can use public classes in an assembly?

Question

Is it possible to restrict who can use public classes in an assembly?

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#1 by (4 votes)

4

The scenario is as follows:

I have a AssemblyProtegido.dll written in .NET that contains public classes. I would like only specific assemblies to consume such classes.

AssemplyProtegido.csproj

public class ClasseProtegida
{
    public void AlgumMetodo() {...}
}

Allowed.csproj

using AssemblyProtegido;

class Classe1 {
    //OK
    private ClasseProtegida obj = new ClasseProtegida();
}

Third.csproj

using AssemblyProtegido;

class Classe1 {
    //lançaria algum tipo de exceção ao tentar instanciar a classe.
    private ClasseProtegida obj = new ClasseProtegida();
}

Is this type of protection possible?

Thank you.

c# .net

asked by anonymous 05.01.2017 / 00:12

1 answer

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score 4 · Accepted Answer

You can make the internal members visible to another specific assembly by using the InternalsVisibleToAttribute ". Obviously, you would have to change from public to internal the statements you want to share with the other specific assembly.

This is an assembly-level attribute.

Usage example (copy from MSDN website):

[assembly: InternalsVisibleTo("NomeDoAssemblyAmigo, PublicKey=002400000480000094" + 
                              "0000000602000000240000525341310004000" +
                              "001000100bf8c25fcd44838d87e245ab35bf7" +
                              "3ba2615707feea295709559b3de903fb95a93" +
                              "3d2729967c3184a97d7b84c7547cd87e435b5" +
                              "6bdf8621bcb62b59c00c88bd83aa62c4fcdd4" +
                              "712da72eec2533dc00f8529c3a0bbb4103282" +
                              "f0d894d5f34e9f0103c473dce9f4b457a5dee" +
                              "fd8f920d8681ed6dfcb0a81e96bd9b176525a" +
                              "26e0b3")]

You can ignore the PublicKey parameter as far as I can remember, but this may constitute a security breach, as another person you can do an assembly with the specified name and use the methods.