.Net实现上传图片按比例自动缩小或放大的方法_实用技巧_

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 /// 按比例缩小图片，自动计算宽度 /// 
 /// 源图文件名(包括路径) /// 缩小后保存为文件名(包括路径) /// 缩小至高度 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; } } /**//// 
 /// 缩小图片 /// 
 /// 源图文件名(包括路径) /// 缩小后保存为文件名(包括路径) /// 缩小至宽度 /// 缩小至高度 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; } }