Silverlight文件下载完美版

页面：hlink.NavigateUri = new Uri(ServiceHelper.BaseUrl + ServicePath.DownFilePath + "?fileName="+((Sys_AttachmentLibraryModel)selDownFile.SelectedItem).FileUrl.ToString());

服务端：DownLoadFileHandler.ashx

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.IO;public class DownLoadFileHandler : BaseService{    public override void ProcessRequest(HttpContext context)    {        Context = context;        Result = new ActionResult();        String fileName = context.Request.QueryString["fileName"]; //客户端保存的文件名         fileName = HttpUtility.UrlDecode(fileName);        String filePath = ConfigHelper.UploadPath+ fileName; //路径         FileInfo fileInfo = new FileInfo(filePath);        if (fileInfo.Exists)        {            byte[] buffer = new byte[102400];            context.Response.Clear();            FileStream iStream = File.OpenRead(filePath);            long dataLengthToRead = iStream.Length; //获取下载的文件总大小             context.Response.ContentType = "application/octet-stream";            context.Response.AddHeader("Content-Disposition", "attachment;  filename=" +                               HttpUtility.UrlEncode(fileName.Substring(fileName.LastIndexOf("\\")+1), System.Text.Encoding.UTF8));            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();        }         // 输出结果        OutputResult();    }}