.NET开发文件的上传下载

Question

if (e.CommandName == "down")
            {
                
                    String FullFileName = System.Web.HttpContext.Current.Server.MapPath(e.CommandArgument.ToString());
                    FileInfo DownloadFile = new FileInfo(FullFileName);
                    System.Web.HttpContext.Current.Response.Clear();
                    System.Web.HttpContext.Current.Response.ClearHeaders();
                    System.Web.HttpContext.Current.Response.Buffer = false;
                    System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream";
                    System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));
                    System.Web.HttpContext.Current.Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                    System.Web.HttpContext.Current.Response.WriteFile(DownloadFile.FullName);
                    System.Web.HttpContext.Current.Response.Flush();
                    System.Web.HttpContext.Current.Response.End();
          } 上传ECXEL文件后，下载的时候，直接打开，出现“发生了DDL错误，并且该错误的说明由于太长不能显示。如果文件名或者路径太长，请重新命名该文件或者将文件复制到其他文件中”。求解决方法。
              

Answer 1

fileupload.ftpwebrequest上传
Response.WriteFile等实现下载
string path = Server.MapPath("~/") + "";
Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.GetEncoding("utf-8")) );
Response.ContentType = "application/octet-stream";
Response.WriteFile("" + path + "");
Response.End();

Answer 2

你应该在新ashx页面中写这些代码。或者是aspx页面，下面是ashx的例子：HttpContext context= System.Web.HttpContext.Current;
String FullFileName = context.Server.MapPath("\\file\\1.txt");
FileInfo Fi = new FileInfo(filePath);
if (Fi.Exists)
{
    FileStream fs = new FileStream(filePath, FileMode.Open);
    byte[] bytes = new byte[(int)fs.Length];
    fs.Read(bytes, 0, bytes.Length);
    fs.Close();
    context.Response.ContentType = "application/octet-stream";//通知浏览器下载文件而不是打开
    context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8));
    context.Response.BinaryWrite(bytes);
    context.Response.Flush();
    context.Response.End();
}