下载文档

HTML：

 <table>
            <tr>
                <td>
                    下载导入模板
                </td>
                <td>
                    <asp:LinkButton ID="lkbtn" runat="server" OnClick="lkbtn_Click">人才档案模板下载</asp:LinkButton>
                </td>
            </tr>
 </table>

下载按钮click事件：

 protected void lkbtn_Click(object sender, EventArgs e)
        {
            DownLoadFile(Server.MapPath("~/App_Data/人才档案模板.xls"), "人才档案模板.xls");
        }

下载函数：

/// <summary>
        /// 下载附件
        /// </summary>
        /// <param name="filepath">文件路径(包括文件名)</param>
        /// <param name="filename">文件名</param>
        public void DownLoadFile(string filepath, string filename)
        {
            if (!System.IO.File.Exists(filepath))
            {
                JScript.AlertAfterLoad("未找到文件!");
                return;
            }
            System.IO.FileStream iStream = null;
            byte[] buffer = new Byte[10000];

            int length;
            long dataToRead;

            try
            {
                iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
                System.IO.FileAccess.Read, System.IO.FileShare.Read);
                dataToRead = iStream.Length;
                Response.AddHeader("Connection", "Keep-Alive");
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename));
                while (dataToRead > 0)
                {
                    if (Response.IsClientConnected)
                    {
                        length = iStream.Read(buffer, 0, 10000);
                        Response.OutputStream.Write(buffer, 0, length);
                        Response.Flush();
                        buffer = new Byte[10000];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception)
            {
                JScript.AlertAfterLoad("文件读取错误!");
            }
            finally
            {
                if (iStream != null)
                {
                    iStream.Close();
                }
            }
        }