OAuth/Sina/HttpPost.cs

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using System;
using System.Collections.Specialized;
using System.IO;
using System.Net;
using System.Text;
using System.Web;

namespace OAuth.Sina
{
    public class HttpPost : BaseHttpRequest
    {
        private const string POST = "POST";
        private const string ContentEncoding = "iso-8859-1";

        public override string Request(string uri, string postData)
        {
            var appendUrl = AppendPostDataToUrl(postData, uri);
            string outUrl;
            var querystring= AppendSignatureString(POST, appendUrl, out outUrl);
            return WebRequest(POST, outUrl, querystring);
        }

        private  string WebRequest(string method, string url, string postData)
        {
            var httpWebRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;
            httpWebRequest.Method = method;
            httpWebRequest.ServicePoint.Expect100Continue = false;
            httpWebRequest.ContentType = "application/x-www-form-urlencoded";
            SetRemoteIPInHeader(httpWebRequest);
            return GetHttpWebResponse(httpWebRequest, postData);
        }

        private static string GetHttpWebResponse(WebRequest httpWebRequest, string postData)
        {
            var requestWriter = new StreamWriter(httpWebRequest.GetRequestStream());
            try
            {
                requestWriter.Write(postData);
            }
            finally
            {
                requestWriter.Close();
            }
            return GetHttpWebResponse(httpWebRequest);
        }

      

        private string AppendPostDataToUrl(string postData, string url)
        {
            if (url.IndexOf("?") > 0)
            {
                url += "&";
            }
            else
            {
                url += "?";
            }
            url += ParsePostData(postData);
            return url;