Why is marking an assembly ComVisible(true) discouraged?

Question

I have always marked my .NET assemblies as visible to COM with [assembly: ComVisible(true)], thinking that I never know when someone might need to call them fro

Answer 1

It is easy and given on MSDN. This is the way how to fix this warning:

using System;
using System.Runtime.InteropServices;

[assembly: ComVisible(false)]
namespace InteroperabilityLibrary
{
   [ComVisible(false)]
   public class BaseClass
   {
      public void SomeMethod(int valueOne) {}
   }

   // This class violates the rule.
   [ComVisible(true)] 
   public class DerivedClass : BaseClass
   {
      public void AnotherMethod(int valueOne, int valueTwo) {}
   }
}

If Base class is in any dll which you are referring in your code. Then, Make [COMVisibible(True)] for derived class. It works in my scenario.