What would be an implementation for MagSetImageScalingCallback using the Magnification API?

I'd like to implement this code in my VS C # project, I did a brief search here, but no impelmentation was found. Here is Windows Magnification API .NET is what I want to do, but in this does not have an implementation of MagSetImageScalingCallback.

      function MagImageScaling(_HWND: hwnd; _srcdata: Pointer;
    _srcheader: MAGIMAGEHEADER; _destdata: Pointer; _destheader: MAGIMAGEHEADER;
      _unclipped: TRect; _clipped: TRect; _dirty: HRGN): BOOL; stdcall;
  var
    _DC: HDC;
    _bmp: TBitmap;
    _Bild: TBitmap;
    _bitmap: HBitmap;
    _info: TBitmapInfo;
  begin
    _DC:= getDC(_HWND);
    Fillchar(_info, sizeof(_info), 0);

    _info.bmiHeader.biSize:= sizeOf(TBitmapInfoHeader);
    _info.bmiHeader.biWidth:= _srcheader.width;
    _info.bmiHeader.biHeight:=  -_srcheader.height;
    _info.bmiHeader.biplanes:= 1;
    _info.bmiHeader.biBitCount:= 32;
    _info.bmiHeader.biCompression:= BI_RGB;

    _bitmap:= 0;
    _bitmap:= CreateDIBitmap(_DC, _info.bmiHeader, CBM_INIT, _srcdata, _info, DIB_RGB_COLORS);

    _bmp:= TBitmap.Create;
    _bmp.PixelFormat:= pf8bit;
    _bmp.Width:= _srcheader.width;
    _bmp.Height:= -_srcheader.height;

    _Bild:= TBitmap.Create;
    _Bild.PixelFormat:= pf8bit;
    _Bild.Width:= _bmp.Width;
    _Bild.Height:= _bmp.Height;

    try
      _bmp.handle:= _bitmap;
      _bmp.Canvas.Lock;
      BitBlt(_bmp.Canvas.Handle, 0, 0, _bmp.Width,
        _bmp.Height, _bitmap, 0, 0, SRCCOPY);
      _bmp.Canvas.Unlock;
      _Bild.Canvas.Draw(0, 0, _bmp);

      FBitmap2.Width:= _Bild.Width;
      FBitmap2.Height:= _Bild.Height;
      FBitmap2.Assign(_Bild);
    finally
      ReleaseDC(_HWND, _DC);
    end;

    DeleteObject(_bitmap);
    DeleteDC(_DC);
    FreeAndNil(_bmp);
    FreeAndNil(_Bild);

    Result:= True;
    CallbackDone:= True;
  end;

This code in Delphi represents exactly what I want to do in C #. Or just converting this Delphi code to C # would help a lot.