RE: 3047138

gistfile1.cs

public class Different
{
    private ISomething something;

    public Different(ISomethingProvider somethingProvider)
    {  
        this.something = somethingProvider.Provide();
    }
}

public class SomethingProvider : ISomethingProvider
{
    ISomething Provide()
    {
        if (...)
        {
            return new SomethingA();
        }
        else
        {
            return new SomethingB();
        }
    }
}