gistfile1.cs

public class BrilliantLogger 
{
  ...

  Dictionary<string,string> _selectedCategories;

  ...
  
  public void Log(string message, string logCategory)
  {
     if (ShouldLog(logCategory))
     {
        WriteToLog(message);
     }
  }

  void ShouldLog(string logCategory) 
  {
    bool shouldLog = false;
    foreach(var key in _selectedCategories.Keys) 
    {
      if (key == category)
        shouldLog = true;
    }
    return shouldLog;
  }
}