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ÎÒµÄpictureBox¿Ø¼þµÄsizemodeµÄÊôÐÔÉèÖÃΪCenterImage
  Rectangle^ rect = gcnew Rectangle(0,0,r-l,b-t);     //l,t,r,b ·Ö±ðΪÊó±ê°´ÏºÍ̧ÆðʱºòµÄX¡¢Y×ø±ê
  Bitmap^ bmp = gcnew Bitmap(r-l,b-t);
  pictureBox->DrawToBitmap(bmp,* rect);
  Graphics^ graphic = Graphics::FromImage(bmp);
  graphic->DrawImage(pictureBox->Image,l ,t,*rect, GraphicsUnit:ixel);
  pictureBox->Image=bmp;
  bmp->Save("C:\\a.jpg",System:rawing::Imaging::ImageFormat::Jpeg);

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