效果：

思路：

简单的有两种方式下载，一种是流下载，一种是WriteFile下载。以下是使用WriteFile下载。

代码：

1 protected void LinkButton1_Click(object sender, EventArgs e) 2         { 3             try 4             { 5                 //WriteFile实现下载(word) 6                 string fileName = "qingpingguo.docx";//客户端保存的文件名 7                 string filePath = Server.MapPath("~\\excel\\" + tb1.Text);//路径 8  9                 FileInfo fileInfo = new FileInfo(filePath);10                 Response.Clear();11                 Response.ClearContent();12                 Response.ClearHeaders();13                 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);14                 Response.AddHeader("Content-Length", fileInfo.Length.ToString());15                 Response.AddHeader("Content-Transfer-Encoding", "binary");16                 Response.ContentType = "application/octet-stream";17                 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");18                 Response.WriteFile(fileInfo.FullName);19                 Response.Flush();20                 Response.End();21             }22             catch (Exception ex)23             {24                 Response.Write(ex.Message);25             }26 27             /*************以下为流方式下载****************/28             //string fileName = "aaa.txt";//客户端保存的文件名29             //string filePath = Server.MapPath("DownLoad/aaa.txt");//路径30 31             ////以字符流的形式下载文件32             //FileStream fs = new FileStream(filePath, FileMode.Open);33             //byte[] bytes = new byte[(int)fs.Length];34             //fs.Read(bytes, 0, bytes.Length);35             //fs.Close();36             //Response.ContentType = "application/octet-stream";37             ////通知浏览器下载文件而不是打开38             //Response.AddHeader("Content-Disposition", "attachment;  filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));39             //Response.BinaryWrite(bytes);40             //Response.Flush();41             //Response.End();42 43         }