public void ProcessRequest(HttpContext context)
  {
   context.Response.ContentType = "text/plain";
   //保存文件
   context.Request.Files[0].SaveAs(context.Server.MapPath("~/1/" + context.Request.Files[0].FileName));
   context.Response.Write("Hello World");
  }

var uploader = WebUploader.create({
   auto: true,
   swf:'/webuploader/Uploader.swf',
   // 文件接收服務(wù)端。
   server: '/Uploader.ashx',
   // 內(nèi)部根據(jù)當(dāng)前運(yùn)行是創(chuàng)建，可能是input元素，也可能是flash.
   pick: '#filePicker',
   chunked: true,//開啟分片上傳
   threads: 1,//上傳并發(fā)數(shù)
   //由于Http的無狀態(tài)特征，在往服務(wù)器發(fā)送數(shù)據(jù)過程傳遞一個(gè)進(jìn)入當(dāng)前頁面是生成的GUID作為標(biāo)示
   formData: {guid:"<%=Guid.NewGuid().ToString()%>"}
  });

public void ProcessRequest(HttpContext context)
  {
   context.Response.ContentType = "text/plain";
   //如果進(jìn)行了分片
   if (context.Request.Form.AllKeys.Any(m => m == "chunk"))
   {
    //取得chunk和chunks
    int chunk =Convert.ToInt32(context.Request.Form["chunk"]);
    int chunks = Convert.ToInt32(context.Request.Form["chunks"]);

    
    //根據(jù)GUID創(chuàng)建用該GUID命名的臨時(shí)文件
    string path = context.Server.MapPath("~/1/" + context.Request["guid"]);
    FileStream addFile = new FileStream(path, FileMode.Append, FileAccess.Write);
    BinaryWriter AddWriter = new BinaryWriter(addFile);
    //獲得上傳的分片數(shù)據(jù)流
    HttpPostedFile file = context.Request.Files[0];
    Stream stream = file.InputStream;

    BinaryReader TempReader = new BinaryReader(stream);
    //將上傳的分片追加到臨時(shí)文件末尾
    AddWriter.Write(TempReader.ReadBytes((int)stream.Length));
    //關(guān)閉BinaryReader文件閱讀器
    TempReader.Close();
    stream.Close();
    AddWriter.Close();
    addFile.Close();

    TempReader.Dispose();
    stream.Dispose();
    AddWriter.Dispose();
    addFile.Dispose();
    //如果是最后一個(gè)分片，則重命名臨時(shí)文件為上傳的文件名
    if (chunk == (chunks - 1))
    {
     FileInfo fileinfo = new FileInfo(path);
     fileinfo.MoveTo(context.Server.MapPath("~/1/" + context.Request.Files[0].FileName));
    }
   }
   else//沒有分片直接保存
   {
    context.Request.Files[0].SaveAs(context.Server.MapPath("~/1/" + context.Request.Files[0].FileName ));
   }
   context.Response.Write("ok");
  }