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标题: .Net上传图片按比例自动缩小或放大 [打印本页]

作者: ajax 时间: 2008-10-25 23:55
标题: .Net上传图片按比例自动缩小或放大
//// <summary>
      /// 按比例缩小图片，自动计算宽度
/// </summary>
      /// <param name="strOldPic">源图文件名(包括路径)</param>
      /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>
      /// <param name="intHeight">缩小至高度</param>
      public void SmallPicWidth(string strOldPic, string strNewPic, int intHeight)
      {
         System.Drawing.Bitmap objPic, objNewPic;
         try
         {
            objPic = new System.Drawing.Bitmap(strOldPic);
            int intWidth = (intHeight / objPic.Height) * objPic.Width;
            objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
            objNewPic.Save(strNewPic);
         }
         catch (Exception exp) { throw exp; }
         finally
         {
            objPic = null;
            objNewPic = null;
         }
      }
      /**//// <summary>
      /// 缩小图片
/// </summary>
      /// <param name="strOldPic">源图文件名(包括路径)</param>
      /// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>
      /// <param name="intWidth">缩小至宽度</param>
      /// <param name="intHeight">缩小至高度</param>
      public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight)
      {
         System.Drawing.Bitmap objPic, objNewPic;
         try
         {
            objPic = new System.Drawing.Bitmap(strOldPic);
            objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
            objNewPic.Save(strNewPic);
         }
         catch (Exception exp)
            { throw exp; }
         finally
         {
            objPic = null;
            objNewPic = null;
         }
      }

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