C# HTTP请求对外接口、第三方接口公用类

    /// <summary>
    /// 网络数据请求公共函数
    /// </summary>
    public class HttpWebRequestCommon
    {

        #region 根据HTTP协议请求接口，不携带参数
        /// <summary>
        /// 根据HTTP协议请求接口，不携带参数
        /// </summary>
        /// <param name="url">请求的第三方接口地址</param>
        /// <returns>接口返回的数据</returns>
        public static string HttpRequest(string url)
        {
            //string returnData = null;
            string ret = string.Empty;
            try
            {
                HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(url);
                webReq.Method = "POST";
                webReq.ContentType = "application/json";
                Stream postData = webReq.GetRequestStream();
                postData.Close();
                HttpWebResponse webResp = (HttpWebResponse)webReq.GetResponse();
                StreamReader sr = new StreamReader(webResp.GetResponseStream(), Encoding.UTF8);
                ret = sr.ReadToEnd();
            }
            catch (Exception ex)
            {
                //LogManager.LogInstance.WriteLog("时间:" + DateTime.Now + "/n 请求出错原因" + ex.ToString());
            }
            return ret;
        }
        #endregion


        #region 根据HTTP协议请求第三方接口数据，携带参数方式在地址后使用占位符拼接参数。传递格式请参照下个函数
        /// <summary>
        /// 根据HTTP协议请求第三方接口数据，携带参数方式在地址后使用占位符拼接参数
        /// </summary>
        /// <param name="PostUrl">请求的第三方地址</param>
        /// <param name="postData">在地址后拼接的参数集合，传递格式请参照调用示范</param>
        /// <returns>接口返回的数据格式</returns>
        public static string HttpRequestUrl(string PostUrl, byte[] postData)
        {
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(PostUrl);
            myRequest.Method = "POST";
            myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentLength = postData.Length;

            Stream newStream = myRequest.GetRequestStream();
            // Send the data.
            newStream.Write(postData, 0, postData.Length);
            newStream.Flush();
            newStream.Close();
            string msg = string.Empty;
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            if (myResponse.StatusCode == HttpStatusCode.OK)
            {
                StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);

                msg = reader.ReadToEnd();
            }
            return msg;
        }
        #endregion


        #region 根据HTTP协议请求第三方接口数据，携带参数方式在地址后使用占位符拼接参数。传递格式请参照下个函数
        /// <summary>
        /// 根据HTTP协议请求第三方接口数据，携带参数方式在地址后使用占位符拼接参数
        /// </summary>
        /// <param name="PostUrl">请求的第三方地址</param>
        /// <param name="postData">在地址后拼接的参数集合，传递格式请参照调用示范</param>
        /// <returns>接口返回的数据格式</returns>
        public static string HttpRequestUrl(string PostUrl, byte[] postData, string POSTisGET)
        {
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(PostUrl);
            myRequest.Method = POSTisGET;
            myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentLength = postData.Length;

            Stream newStream = myRequest.GetRequestStream();
            // Send the data.
            newStream.Write(postData, 0, postData.Length);
            newStream.Flush();
            newStream.Close();
            string msg = string.Empty;
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            if (myResponse.StatusCode == HttpStatusCode.OK)
            {
                StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);

                msg = reader.ReadToEnd();
            }
            return msg;
        }
        #endregion


        #region  上面HttpRequestUrl函数的调用示范，url存请求地址。参数通过字符串占位符拼接
        //string url = "https://api.weixin.qq.com/cgi-bin/token";

        //string postStrTpl = "grant_type=client_credential&appid={0}&secret={1}";

        //UTF8Encoding encoding = new UTF8Encoding();
        //byte[] postData = encoding.GetBytes(string.Format(postStrTpl, "参数一", "参数二"));

        //string retString = HttpWebRequestCommon.RequestUrl(url, postData);
        #endregion


        #region 根据HTTP协议请求第三方接口，携带XML参数
        /// <summary>
        /// 根据HTTP协议请求第三方接口，携带XML参数
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="data">携带的XML数据</param>
        /// <returns>接口返回的数据</returns>
        public static string HttpRequestXml(string url, string data)
        {
            //string returnData = null;
            string ret = string.Empty;
            try
            {
                byte[] buffer = Encoding.GetEncoding("UTF-8").GetBytes(data);
                HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(url);
                webReq.Method = "POST";
                webReq.ContentType = "application/x-www-form-urlencoded";
                webReq.ContentLength = buffer.Length;
                Stream postData = webReq.GetRequestStream();
                postData.Write(buffer, 0, buffer.Length);
                postData.Close();
                HttpWebResponse webResp = (HttpWebResponse)webReq.GetResponse();
                StreamReader sr = new StreamReader(webResp.GetResponseStream(), Encoding.UTF8);
                ret = sr.ReadToEnd();
            }
            catch (Exception ex)
            {
                //LogManager.LogInstance.WriteLog("时间:" + DateTime.Now + "/n 请求出错原因" + ex.ToString());
            }
            return ret;
        }
        #endregion


        #region 根据HTTP协议请求第三方接口，携带Json参数
        /// <summary>
        /// 根据HTTP协议请求第三方接口，携带Json参数。 
        /// </summary>
        /// <param name="url">请求的第三方地址</param>
        /// <param name="content">Post提交数据内容(utf-8编码的)</param>
        /// <returns>接口返回的数据</returns>
        public static string HttpRequestJson(string url, string content)
        {
            string result = "";
            //ServicePointManager.ServerCertificateValidationCallback += (s, cert, chain, sslPolicyErrors) => true;
            //ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/json";

            #region 添加Post 参数
            byte[] data = Encoding.UTF8.GetBytes(content);
            req.ContentLength = data.Length;

            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();
            }
            #endregion

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            //获取响应内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }
        #endregion

    }