文件管理

1.文件上传

UI:

        <div class="row">
            <form id="form1" class="form-horizontal" runat="server" method="post" enctype="multipart/form-data">
                <div>
                    <h2>文件上传</h2>
                    <input type="file" name="file"  class="input-group"/>
                    <input type="submit" name="sub" class="input-group" value="Up" />
                </div>
            </form>
        </div>

root:

       protected void Page_Load(object sender, EventArgs e)
        { 
            if (Context.Request.Files.Count > 0)//如果存在文件则保存文件
            {
                SaveFile();
            }
          } 

        private void SaveFile()
        {
            HttpPostedFile hpf = Request.Files["file"];  //获取文件
            FileModel fm = GetFileInfor(hpf);            //获取文件信息
            string url = "Up/" + fm.newFileName;         //获取保存路径，比如指定用户的
            hpf.SaveAs(Context.Server.MapPath(url));     //保存文件
        }
        private class FileModel
        {
            public string FileName { set; get; }
            public string FileSize { set; get; }
            public string FileUrl { set; get; }
            public string FileEnd { set; get; }
            public string newFileName { set; get; }
            public string InputStream { set; get; }
        }
        private FileModel GetFileInfor(HttpPostedFile hpf)
        {
            FileModel fm = new FileModel();

            string file = hpf.FileName;
            fm.FileName = System.IO.Path.GetExtension(file);
            fm.newFileName = Guid.NewGuid().ToString() + "_" + fm.FileName;
            fm.FileEnd = System.IO.Path.GetExtension(file);
            fm.FileUrl = System.IO.Path.GetFullPath(file);
            fm.FileSize = hpf.ContentLength.ToString();

            return fm;
        }  //获取文件信息

2.文件下载（只能下载有的文件，需要下载流的？）

ui

        <div class="row">
            <div class="col-md-2"></div>
            <div class="col-md-8">
                <h2>文件下载</h2>
                <ul>
                    <li>
                        <a target="_blank" href="../42/File.aspx?down=bootstrap.min.css">图片下载 </a>
                    </li>
                </ul>
            </div>
            <div class="col-md-2"></div>
        </div>

root

        protected void Page_Load(object sender, EventArgs e)
        { 
            if (Context.Request.QueryString["down"] != null)
            {
                DownFile(Request["down"]);
            }
        }
        private void DownFile(string fileName)
        {
            Context.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
            //if dilog window ,need add Header
            Response.WriteFile(fileName);
        }