asp.net post任何数据类型流到网站当当网API传XML文件

下面的代码可以post任何类型文件，主要是把数据流统一转换为base64格式.

//------------------------------发送部分--------------------------------------------------



        string url = "http://localhost/im/upfile?aa=5";//发送到的页面的地址

         HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);



         //读取一个图片

         FileStream fs = new FileStream(Server.MapPath("~/NET基础知识.doc"), 
              System.IO.FileMode.Open,     

              System.IO.FileAccess.Read);

         byte[] filecontent = new byte[fs.Length];

         fs.Read(filecontent, 0, filecontent.Length);

         fs.Close();

         fs.Dispose();



         //将图片转换成base64编码的流

         string a = Convert.ToBase64String(filecontent);       

   

         //读取base64编码流，发送

         byte[] requestBytes = System.Text.Encoding.Default.GetBytes(a);



         req.Method = "POST";

         req.ContentType = "application/x-www-form-urlencoded";

         req.ContentLength = requestBytes.Length;

         Stream requestStream = req.GetRequestStream();

         requestStream.Write(requestBytes, 0, requestBytes.Length);

         requestStream.Close();



         //接收返回参数，到string backstr

         HttpWebResponse res = (HttpWebResponse)req.GetResponse();

         StreamReader sr = new StreamReader(res.GetResponseStream(), 
            System.Text.Encoding.Default);

         string backstr = sr.ReadToEnd();

         sr.Close();

         res.Close();

         //输出参数

         Response.Write(backstr);

//-----------------------------------------------接收部分-----------------------------------


         //接收到的参数

         string bb= Request.QueryString["aa"];

         Encoding myEncoding = Encoding.GetEncoding("utf-8");



         //接收传递过来的数据流

         Stream resStream = Request.InputStream;



         byte[] filecontent = new byte[resStream.Length];

         //将数据流读入byte数组

         resStream.Read(filecontent, 0, filecontent.Length);

         //数组转换为string以便转换base64使用

         string a = myEncoding.GetString(filecontent);

         //将string读取base64解密到byte数组

         byte[] filecontent2 = Convert.FromBase64String(a);

         //写入目录

         File.WriteAllBytes(Server.MapPath("~/"+bb+".doc"), filecontent2);

         //返回值

         Response.Write("ok");

         Response.End();