- C# code
HttpPostedFile fileValue = context.Request.Files["FileValue"];//FileValue是前台file控件的id//如果我想获得客户选择文件的客户端的完整路径 string test = fileValue.FileName;//这样写我在ie浏览器中断点调试可以完全获得客户端的路径，我在ff或谷歌浏览器调试错误，只能获得文件名。不知道为什么。求解……
------解决方案--------------------------------------------------------
生成缩略图要客户端路径干嘛？需要的是服务器路径
另外，不要路径也能生成缩略图
不经保存，直接生成上传图片的等比例的高质量缩略图
- HTML code
<%@ Page Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"> protected void Button1_Click(object sender, EventArgs e) { String fileExt = System.IO.Path.GetExtension(FileUpload1.FileName); System.Drawing.Image image = System.Drawing.Image.FromStream(new System.IO.MemoryStream(FileUpload1.FileBytes)); int newWidth = 300, newHeight = 200; if ((decimal)image.Width / image.Height > (decimal)newWidth / newHeight) { newHeight =Convert.ToInt32((decimal)image.Height * newWidth / image.Width); } else if ((decimal)image.Width / image.Height < (decimal)newWidth / newHeight) { newWidth = Convert.ToInt32((decimal)image.Width * newHeight / image.Height); } System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(newWidth, newHeight); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp); g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, newWidth, newHeight); g.DrawImage(image, rectDestination, 0, 0, image.Width, image.Height, System.Drawing.GraphicsUnit.Pixel); bmp.Save(Server.MapPath("~/") + DateTime.Now.ToString("yyyyMMddHHmmss") + fileExt); bmp.Dispose(); image.Dispose(); }</script><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>不经保存，直接生成上传图片的等比例的高质量缩略图</title></head><body> <form id="form1" runat="server"> <asp:FileUpload ID="FileUpload1" runat="server" /> <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="上传并生成缩略图" /> </form></body></html>
------解决方案--------------------------------------------------------
ashx中的方法
- C# code
<%@ WebHandler Language="C#" Class="UploadFile" Debug="true" %>using System;using System.Web;public class UploadFile : IHttpHandler { public void ProcessRequest (HttpContext context) { context.Response.ContentType = "text/plain"; HttpPostedFile f1 = context.Request.Files["f1"]; String fileExt = System.IO.Path.GetExtension(f1.FileName); System.Drawing.Image image = System.Drawing.Image.FromStream(f1.InputStream); int newWidth = 300, newHeight = 200; if ((decimal)image.Width / image.Height > (decimal)newWidth / newHeight) { newHeight = Convert.ToInt32((decimal)image.Height * newWidth / image.Width); } else if ((decimal)image.Width / image.Height < (decimal)newWidth / newHeight) { newWidth = Convert.ToInt32((decimal)image.Width * newHeight / image.Height); } System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(newWidth, newHeight); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp); g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, newWidth, newHeight); g.DrawImage(image, rectDestination, 0, 0, image.Width, image.Height, System.Drawing.GraphicsUnit.Pixel); bmp.Save(context.Server.MapPath("~/") + DateTime.Now.ToString("yyyyMMddHHmmss") + fileExt); bmp.Dispose(); image.Dispose(); context.Response.Write("OK");} public bool IsReusable { get { return false; } }}