//HyperlinkButton Click事件 
 private void jy_Click(object sender, RoutedEventArgs e)
        {

            //初始化WCF对象
            WcfServiceClient.WcfServiceClient wcfClient = new WcfServiceClient.WcfServiceClient();
            wcfClient.AddNewSampleInfoCompleted += new EventHandler<AddNewSampleInfoCompletedEventArgs>(ActionAdd);
            wcfClient.AddNewSampleInfoAsync(baseInfo);
        }

 void ActionAdd(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
        {
            string strPath = @"UploadFiles/20130719/20130719/物流时刻.xls";


            FunctionBase funBase = new FunctionBase();
            funBase.BaseDownFiles(strPath);

        }

 #region 文件下载
        /// <summary>
        /// 文件下载
        /// </summary>
        /// <param name="strPath">文件路径</param>
        public void BaseDownFiles(string strPath)
        {

            //获取系统绝对路径
            string strFullUri = Application.Current.Host.Source.AbsoluteUri;

            //索引，用于截取相对服务器路径
            int index = strFullUri.IndexOf("/ClientBin");

            //服务器路径
            string strUri = strFullUri.Substring(0, index);

            //调用Handle
            string handle = "/DownLoad.ashx?FileName=";

            //对文件路径进行编码
            strPath = UnicodeConvert.ToUnicode(strPath);

            //设置跳转路径
            Uri uri = new Uri(strUri + handle + strPath, UriKind.Absolute);
       
            //操作DOM
            HtmlPage.PopupWindow(uri, "_self", new HtmlPopupWindowOptions());
        }
        #endregion

 private long ChunkSize = 102400;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力
        public void ProcessRequest(HttpContext context)
        {
            //string strLocationPath = HttpContext.Current.Request.Url.ToString().Replace(
            //    HttpContext.Current.Request.Url.ToString().Substring(
            //    HttpContext.Current.Request.Url.ToString().IndexOf("SLContainer"), 12), "");

            string tmpfileName = context.Request.QueryString["FileName"];

            string fileName = UnicodeConvert.FromUnicode(tmpfileName); ;
            string filePath = AppDomain.CurrentDomain.BaseDirectory + fileName;
            System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
            if (fileInfo.Exists == true)
            {
                byte[] buffer = new byte[ChunkSize];

                context.Response.Clear();

                FileStream iStream = File.OpenRead(filePath);
                long dataLengthToRead = iStream.Length; //获取下载的文件总大小
                context.Response.AddHeader("Content-Disposition", "attachment;  filename=" +
                   HttpUtility.UrlEncode(fileInfo.Name));
                Utils utils = new Utils();
                context.Response.ContentType = utils.GetContentType(fileInfo.FullName); //"application/octet-stream";
                context.Response.AddHeader("Content-Length", fileInfo.Length.ToString());

                while (dataLengthToRead > 0 && context.Response.IsClientConnected)
                {
                    int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(102400));//'读取的大小

                    context.Response.OutputStream.Write(buffer, 0, lengthRead);
                    context.Response.Flush();
                    dataLengthToRead = dataLengthToRead - lengthRead;
                }
                //context.Response.Close();
                context.Response.End();