如何利用.net一般处理程序下载文件

Question

"url"是从数据库里出去出来的
string url = "~/AA/BB/cc.doc"                HttpContext.Current.Response.ContentType = "application/ms-download";
                string s_path = HttpContext.Current.Server.MapPath(url);
                System.IO.FileInfo file = new System.IO.FileInfo(s_path);
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.AddHeader("Content-Type", "application/octet-stream");
                HttpContext.Current.Response.Charset = "utf-8";
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(file.Name, System.Text.Encoding.UTF8));
                HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());
                HttpContext.Current.Response.WriteFile(file.FullName);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.End();

Answer 1

你一直Clear  做什么？