视图层界面：
@{ ViewBag.Title = "Home Page"; } <div class="jumbotron"> <h1>ASP.NET</h1> <p class="lead">ASP.NET is a free web framework for building great Web sites and Web applications using HTML, CSS and JavaScript.</p> <p><a href="https://asp.net" class="btn btn-primary btn-lg">Learn more »</a></p> </div> <h2>上传文件</h2> <br /> @*new {enctype = "multipart/form-data"}将表单设置成允许文件上传或下载*@ @using (Html.BeginForm("Upload","Home", FormMethod.Post,new {enctype = "multipart/form-data"})) { <text>选择上传文件：</text> <input name="file" type="file" id="file"/> <br /> <input type="submit" name="upload" value="上传"/> } <br /> <br /> <div> <a href="/Home/DownLoad?filepath=@ViewBag.value&filename='2.jpg'">图片2</a><br /> <a href="/Home/DownLoad?filepath=@ViewBag.value&filename='新建文本文档.txt'">文档</a> </div>控制层代码：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using System.Text; using System.IO; namespace WebApplication1.Controllers { public class HomeController : Controller { public ActionResult Index() { ViewBag.value = Server.MapPath("~/File/Upload/"); return View(); } public ActionResult About() { ViewBag.Message = "Your application description page."; return View(); } public ActionResult Contact() { ViewBag.Message = "Your contact page."; return View(); } public ActionResult Upload() { if (Request.Files.Count==0) { return Content("请选择上传文件"); } var file = Request.Files[0]; if (file.ContentLength==0) { return Content("请选择存在的文件"); } else { string target = Server.MapPath("/") + "File/Upload/"; string filename = file.FileName; file.SaveAs(target + filename); return Content("上传成功"); } } public ActionResult DownLoad(string filepath,string filename) { Encoding encoding; string downloadfile = null; filename = filename.Replace("'", ""); string browser = Request.UserAgent.ToUpper(); downloadfile = HttpUtility.UrlEncode(filename); encoding = Encoding.GetEncoding("GB2312"); //if (browser.Contains("FIREFOX")) //{ //} //else //{ // downloadfile = HttpUtility.UrlEncode(filename); // encoding = Encoding.Default; //} FileStream fs=new FileStream(filepath+filename, FileMode.Open); byte[] buffer = new byte[fs.Length]; fs.Read(buffer, 0, buffer.Length); fs.Close(); Response.Charset = "UTF-8"; Response.ContentType = "application/octet-stream"; Response.ContentEncoding = encoding; Response.AddHeader("Content-Disposition", "attachment; filename=" + downloadfile); Response.BinaryWrite(buffer); Response.Flush(); Response.End(); return Content("下载完成！"); } } }演示： 我这里下载的是指定的文件图片2
