C# POST提交请求 并获得返回值 可用于接口

 string strURL = "http://211.136.105.27:81/test.aspx";
        System.Net.HttpWebRequest request;
        request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
        //Post请求方式
        request.Method = "POST";
        //内容类型
        request.ContentType = "application/x-www-form-urlencoded";
        //参数经过URL编码
        string paraUrlCoded = "id=10";
        byte[] payload;
        //将URL编码后的字符串转化为字节
        payload = System.Text.Encoding.UTF32.GetBytes(paraUrlCoded);
        //设置请求的ContentLength
        request.ContentLength = payload.Length;
        //获得请求流
        Stream writer = request.GetRequestStream();
        //将请求参数写入流
        writer.Write(payload, 0, payload.Length);
        //关闭请求流
        writer.Close();
        System.Net.HttpWebResponse response;
        //获得响应流
        response = (System.Net.HttpWebResponse)request.GetResponse();
        System.IO.Stream s;
        s = response.GetResponseStream();

        string StrDate = "";
        string strValue = "";
        StreamReader Reader = new StreamReader(s, Encoding.Default);
        while ((StrDate = Reader.ReadLine()) != null)
        {
            strValue += StrDate + "\r\n";
        }
        Response.Write(strValue);