asp.net实现服务器文件下载到本地

    //服务器文件路径
    string strFilePath = Server.MapPath("~") + "/excel/20170206104654.xlsx";

    FileInfo fileInfo = new FileInfo(strFilePath);
    Response.Clear();
    Response.AddHeader("content-disposition", "attachment;filename=" + Server.UrlEncode(fileInfo.Name.ToString()));
    Response.AddHeader("content-length", fileInfo.Length.ToString());
    Response.ContentType = "application/octet-stream";
    Response.ContentEncoding = System.Text.Encoding.Default;
    Response.WriteFile(strFilePath);