我有一个aspx页面,将上传图像到服务器硬盘从客户端pc
但现在我需要改变我的程序,这将允许我在上传时调整图像的大小。
有人有任何想法吗?我不能找到这些属性/方法与输入文件服务器控制
任何一个有指导我?
解决方法
一旦文件已保存到服务器,您可以使用这样的代码来调整大小。这个代码将在调整大小时处理长宽比。
- public static Bitmap CreateThumbnail(string lcFilename,int lnWidth,int lnHeight)
- {
- System.Drawing.Bitmap bmpOut = null;
- try
- {
- Bitmap loBMP = new Bitmap(lcFilename);
- ImageFormat loFormat = loBMP.RawFormat;
- decimal lnRatio;
- int lnNewWidth = 0;
- int lnNewHeight = 0;
- if (loBMP.Width < lnWidth && loBMP.Height < lnHeight)
- return loBMP;
- if (loBMP.Width > loBMP.Height)
- {
- lnRatio = (decimal)lnWidth / loBMP.Width;
- lnNewWidth = lnWidth;
- decimal lnTemp = loBMP.Height * lnRatio;
- lnNewHeight = (int)lnTemp;
- }
- else
- {
- lnRatio = (decimal)lnHeight / loBMP.Height;
- lnNewHeight = lnHeight;
- decimal lnTemp = loBMP.Width * lnRatio;
- lnNewWidth = (int)lnTemp;
- }
- bmpOut = new Bitmap(lnNewWidth,lnNewHeight);
- Graphics g = Graphics.FromImage(bmpOut);
- g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
- g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
- g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
- g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
- g.FillRectangle(Brushes.White,lnNewWidth,lnNewHeight);
- g.DrawImage(loBMP,lnNewHeight);
- loBMP.Dispose();
- }
- catch
- {
- return null;
- }
- return bmpOut;
- }