Question

How can I force an object to be called only via its interface? That can only accomplish via Access Modifier but in C# can’t do.

I have:

public interface IProfile { string GetName(); }
public class Profile : IProfile { 
    public string GetName() { return "Linh"; }
}

I have a code section like that above. I put it in a class library after that I generate an assembly.

In a web project some programmers will add reference to that assembly. If they want to call Profile class then they must use IProfile interface as declaration below:

IProfile ip = new Profile(); 
ip.GetName(); 

But some careless programmers won’t do so. They will use below way:

Profile pr = new Profile(); 
pr.GetName();

Answer 1

This is really simple. Use an explicit interface implementation:

public interface IProfile { string GetName(); }
public class Profile : IProfile
{
    string IProfile.GetName() { return "Linh"; }
}

GetName can now only be called through an interface reference.