SecurityException: ECall methods must be packaged into a system module

Question

I have a (C#) function similar to the following.

private static bool SpecialCase = false;

public void Foo()
{
    if (SpecialCase)
    {
        InternalMet         


        

Answer 1

Add attribute [ComImport] to your class declaration

Answer 2

You may want to check the compiler directives as a possible option. Unlike using a run-time "if", this will determine whether the call is included in the compiled code at all, rather than always compiling it into the code and trying to determine whether to call it at run-time (which is too late, based on your analysis).

Your use-case seems like a testing/validation scenario, which means that you don't need it compiled into the code except when the internal call will actually be made.

Note that if your use-case involves a non-.NET runtime, you should provide more information since that could drastically change the correct answer.