remove DI

gistfile1.cs

// before refactoring

class ImageConverter
{
  public ImageConverer(IImageConvterFactory factory /* use DI */)
  {
    this.factory = factory;
  }

  public void Convert()
  {
     IImageConvertAlgorithm alg = this.factory.GetAlgorithm();
     // use alg
  }
}

// after refactoring

class ImageConverterBase
{
   protected ImageConverterBase(IImageConvertAlgorithm alg)
   { ... }

   public void Convert()
   { ... }
}

class ImageConverterLargeMemory : ImageConverterBase
{
   public ImageConverterLargeMemory()
     : base(new ImageConvertAlgorithmLargeMemory())
   {
   }
}

class ImageConverterSmallMemory : ImageConverterBase
{
   public ImageConverterLargeMemory()
     : base(new ImageConvertAlgorithmSmallMemory())
   {
   }
}