C#URL中GET与POST请求

参考来源网络，具体不记得了。如有侵权，请告知

以下是本人调试代码
using System.Net;
using System.Net.Http;

        public string Post(string url, string jsonParas)
        {
            string strURL = url;
            //创建一个HTTP请求  
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
            //Post请求方式  
            request.Method = "POST";
            //内容类型
            request.ContentType = "application/json";

            //设置参数，并进行URL编码 
            string paraUrlCoded = jsonParas;//System.Web.HttpUtility.UrlEncode(jsonParas);   

            byte[] payload;
            //将Json字符串转化为字节  
            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            //设置请求的ContentLength   
            request.ContentLength = payload.Length;
            //发送请求，获得请求流 

            Stream writer;
            try
            {
                writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象
            }
            catch (Exception)
            {
                writer = null;
                Console.Write("连接服务器失败!");
            }
            //将请求参数写入流
            writer.Write(payload, 0, payload.Length);
            writer.Close();//关闭请求流
                           // String strValue = "";//strValue为http响应所返回的字符流
            HttpWebResponse response;
            try
            {
                //获得响应流
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = ex.Response as HttpWebResponse;
            }
            Stream s = response.GetResponseStream();
            //  Stream postData = Request.InputStream;
            StreamReader sRead = new StreamReader(s);
            string postContent = sRead.ReadToEnd();
            sRead.Close();
            return postContent;//返回Json数据
        }
        /// <summary>
        /// 指定Url地址使用Get 方式获取全部字符串
        /// </summary>
        /// <param name="url">请求链接地址</param>
        /// <returns></returns>
        public string Get(string url)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            try
            {
                //获取内容
                using (StreamReader reader = new StreamReader(stream))
                {
                    result = reader.ReadToEnd();
                }
            }
            finally
            {
                stream.Close();
            }
            return result;
        }
        /// <summary>
        /// 发送Get请求
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="dic">请求参数定义</param>
        /// <returns></returns>
        public string Get(string url, Dictionary<string, string> dic)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            foreach (var item in dic)
            {
                req.Headers.Add(item.Key, item.Value);
            }
            //GET请求方式  
            req.Method = "GET";
            //内容类型
            req.ContentType = "application/json";
            //添加参数
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            try
            {
                //获取内容
                using (StreamReader reader = new StreamReader(stream))
                {
                    result = reader.ReadToEnd();
                }
            }
            finally
            {
                stream.Close();
            }
            return result;
        }