</pre></p><p></p><pre class="csharp" name="code"><strong><span style="color:#ff0000;">1.POST方法(httpWebRequest)</span></strong>

#region  POST方法(httpWebRequest)

//body是要传递的参数,格式"roleId=1&uid=2"
//post的cotentType填写:
//"application/x-www-form-urlencoded"
//soap填写:"text/xml; charset=utf-8"
    public static string PostHttp(string url, string body, string contentType)
    {
        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);

        httpWebRequest.ContentType = contentType;
        httpWebRequest.Method = "POST";
        httpWebRequest.Timeout = 20000;

        byte[] btBodys = Encoding.UTF8.GetBytes(body);
        httpWebRequest.ContentLength = btBodys.Length;
        httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);

        HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
        string responseContent = streamReader.ReadToEnd();

        httpWebResponse.Close();
        streamReader.Close();
        httpWebRequest.Abort();
        httpWebResponse.Close();

        return responseContent;
    }
#endregion

</pre></p><p></p><pre class="csharp" name="code"><strong><span style="color:#ff0000;">2.POST方法(WebClient)</span></strong>

/// <summary>
        /// 通过WebClient类Post数据到远程地址，需要Basic认证；
        /// 调用端自己处理异常
        /// </summary>
        /// <param name="uri"></param>
        /// <param name="paramStr">name=张三&age=20</param>
        /// <param name="encoding">请先确认目标网页的编码方式</param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string Request_WebClient(string uri, string paramStr, Encoding encoding, string username, string password)
        {
            if (encoding == null)
                encoding = Encoding.UTF8;

            string result = string.Empty;

            WebClient wc = new WebClient();

            // 采取POST方式必须加的Header
            wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");

            byte[] postData = http://www.mamicode.com/encoding.GetBytes(paramStr);

            if (!string.IsNullOrEmpty(username) && !string.IsNullOrEmpty(password))
            {
                wc.Credentials = GetCredentialCache(uri, username, password);
                wc.Headers.Add("Authorization", GetAuthorization(username, password));
            }

            byte[] responseData = http://www.mamicode.com/wc.UploadData(uri, "POST", postData); // 得到返回字符流>
</pre></p><p></p><pre class="csharp" name="code"><strong><span style="color:#ff0000;">3.Get方法(HttpWebRequest)</span></strong>
         public static string GetHttp(string url, HttpContext httpContext)
        {
        string queryString = "?";
        foreach (string key in httpContext.Request.QueryString.AllKeys)
        {
            queryString += key + "=" + httpContext.Request.QueryString[key] + "&";
        }
        queryString = queryString.Substring(0, queryString.Length - 1);
        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url + queryString);
        httpWebRequest.ContentType = "application/json";
        httpWebRequest.Method = "GET";
        httpWebRequest.Timeout = 20000;
        //byte[] btBodys = Encoding.UTF8.GetBytes(body);
        //httpWebRequest.ContentLength = btBodys.Length;
        //httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);
        HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
        string responseContent = streamReader.ReadToEnd();
        httpWebResponse.Close();
        streamReader.Close();
        return responseContent;
    }
</pre></p><p></p><pre class="csharp" name="code"><strong><span style="color:#ff0000;">4.basic验证的WebRequest/WebResponse</span></strong>
        /// <summary>
        /// 通过 WebRequest/WebResponse 类访问远程地址并返回结果，需要Basic认证；
        /// 调用端自己处理异常
        /// </summary>
        /// <param name="uri"></param>
        /// <param name="timeout">访问超时时间，单位毫秒；如果不设置超时时间，传入0</param>
        /// <param name="encoding">如果不知道具体的编码，传入null</param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string Request_WebRequest(string uri, int timeout, Encoding encoding, string username, string password)
        {
            string result = string.Empty;
            WebRequest request = WebRequest.Create(new Uri(uri));
            if (!string.IsNullOrEmpty(username) && !string.IsNullOrEmpty(password))
            {
                request.Credentials = GetCredentialCache(uri, username, password);
                request.Headers.Add("Authorization", GetAuthorization(username, password));
            }
            if (timeout > 0)
                request.Timeout = timeout;
            WebResponse response = request.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader sr = encoding == null ? new StreamReader(stream) : new StreamReader(stream, encoding);
            result = sr.ReadToEnd();
            sr.Close();
            stream.Close();
            return result;
        }
        #region # 生成 Http Basic 访问凭证 #
        private static CredentialCache GetCredentialCache(string uri, string username, string password)
        {
            string authorization = string.Format("{0}:{1}", username, password);
            CredentialCache credCache = new CredentialCache();
            credCache.Add(new Uri(uri), "Basic", new NetworkCredential(username, password));
            return credCache;
        }
        private static string GetAuthorization(string username, string password)
        {
            string authorization = string.Format("{0}:{1}", username, password);
            return "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(authorization));
        }
        #endregion

实现http的post和get的几种方法