C# POST提交

protected   string  GetWebContent( string  url)
    {
        Stream outstream  =   null ;
        Stream instream  =   null ;
        StreamReader sr  =   null ;
        HttpWebResponse response  =   null ;
        HttpWebRequest request  =   null ;
         //  要注意的这是这个编码方式，还有内容的Xml内容的编码方式
        Encoding encoding  =  Encoding.GetEncoding( " GBK " );
         byte [] data  =  encoding.GetBytes(url);

         //  准备请求,设置参数
        request  =  WebRequest.Create(url)  as  HttpWebRequest;
        request.Method  =   " POST " ;
         // request.ContentType = "text/plain";
        request.ContentLength  =  data.Length;

        outstream  =  request.GetRequestStream();
        outstream.Write(data,  0 , data.Length);
        outstream.Flush();
        outstream.Close();
         // 发送请求并获取相应回应数据

        response  =  request.GetResponse()  as  HttpWebResponse;
         // 直到request.GetResponse()程序才开始向目标网页发送Post请求
        instream  =  response.GetResponseStream();
        sr  =   new  StreamReader(instream, encoding);
         // 返回结果网页(html)代码

         string  content  =  sr.ReadToEnd();
         return  content;
    }