[C#] POST 傳值

之前有一個動作需要post到數個不同的地方做檢驗,
所以就把這整理成一個Function

用法很簡單,
uri為要post傳送出去的網址
parameters為要傳送的字串

<EX> parameters="gamecode=Vmtab2QxZHNRbEpRVkRBOSpQ&transpoint=999"

    string HttpPost(string uri, string parameters)

    {  

        WebRequest webRequest = WebRequest.Create(uri);

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

        webRequest.Method = "POST";

        byte[] bytes = Encoding.ASCII.GetBytes(parameters);

        Stream os = null;

        try

        { // send the Post

            webRequest.ContentLength = bytes.Length;   //Count bytes to send

            os = webRequest.GetRequestStream();

            os.Write(bytes, 0, bytes.Length);         //Send it

        }

        catch (WebException ex)

        {

            Response.Write(" <script   language=JavaScript> alert( 'HttpPost: Request error'); </script> "); 

        }

        finally

        {

            if (os != null)

            {

                os.Close();

            }

        }

        try

        { // get the response

            WebResponse webResponse = webRequest.GetResponse();

            if (webResponse == null)

            { return null; }

            StreamReader sr = new StreamReader(webResponse.GetResponseStream());

            return sr.ReadToEnd().Trim();

        }

        catch (WebException ex)

        {

            Response.Write(" <script   language=JavaScript> alert( 'HttpPost: Response error'); </script> ");

        }

        return null;

    } // end HttpPost