WebClient 文件下载

//文件地址
            var path = Utils.GetQueryStringValue("path");//带有http
            //下载文件到前台文件夹Music下
            WebClient client = new WebClient();
            string URLAddress = Common.Utils.GetDataCenterImgUrl()+path;
            string receivePath = HttpContext.Current.Server.MapPath("~/music/");
            string filepath = receivePath + System.IO.Path.GetFileName(URLAddress);
            client.DownloadFile(URLAddress, filepath);
            //下载文件
            HttpContext.Current.Response.ContentType = "application/ms-download";
            string s_path = filepath;
            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();