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private void btnUploadPicture_Click(object sender, System.EventArgs e)
{
   //¼ì²éÉÏ´«ÎļþµÄ¸ñʽÊÇ·ñÓÐЧ
   if(this.UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < 0)
   {
    Response.Write("ÉÏ´«Í¼Æ¬¸ñʽÎÞЧ£¡");
    return;
   }
   //Éú³Éԭͼ
   Byte[] oFileByte = new byte[this.UploadFile.PostedFile.ContentLength];
   System.IO.Stream oStream = this.UploadFile.PostedFile.InputStream;
   System.Drawing.Image oImage = System.Drawing.Image.fromStream(oStream);
   int oWidth = oImage.Width; //ԭͼ¿í¶È
   int oHeight = oImage.Height; //ԭͼ¸ß¶È
   int tWidth = 100; //ÉèÖÃËõÂÔͼ³õʼ¿í¶È
   int tHeight = 100; //ÉèÖÃËõÂÔͼ³õʼ¸ß¶È
   //°´±ÈÀý¼ÆËã³öËõÂÔͼµÄ¿í¶ÈºÍ¸ß¶È
   if(oWidth >= oHeight)
   {
    tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));
   }
   else
   {
    tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));
   }
   //Éú³ÉËõÂÔԭͼ
   Bitmap tImage = new Bitmap(tWidth,tHeight);
   Graphics g = Graphics.fromImage(tImage);
   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //ÉèÖøßÖÊÁ¿²åÖµ·¨
   g.SmoothingMode = System.Drawin


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