C#请求使用JWT认证的接口，怎么在请求头添加Token

//get请求方式，不需要请求参数时

            string token = "";//获取完Token使用Bearer+空格+Token
            string url = "";//接口地址
            HttpWebRequest request =  (HttpWebRequest)WebRequest.Create(url);
            request.Timeout = 20000;  //超时时间
            request.Method = "GET";  //请求方式
            request.KeepAlive = true; //解决GetResponse操作超时问题
            request.Headers.Add("Authorization", token); //如果接口需要鉴权, 把"token"换成自己需要的
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            //获取响应内容，返回的数据格式: {"code": 200,"resultMsg": "Success","count": 20,"dataList": []}
            string postContent = new StreamReader(response.GetResponseStream()).ReadToEnd();
            //结果解析,异常情况判断
            JObject json = JObject.Parse(postContent);
            var code = json["code"];
            var dataList = json["dataList"];

//get请求方式，需要请求参数时

            string ID = "AE3D9B51-41C8-4EFA-B146-1C4B14D02768";
            string token = "";//获取完Token使用Bearer+空格+Token
            string url = "";//接口地址
            //如果多个参数后边使用&符号拼接就是
            url = url + "?" + "ID=" + ID.ToString();
            //url = url + "?" + "ID=" + ID.ToString().Trim('&');
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Timeout = 20000;  //超时时间
            request.Method = "GET";  //请求方式
            request.KeepAlive = true; //解决GetResponse操作超时问题
            request.Headers.Add("Authorization", token); //如果接口需要鉴权, 把"token"换成自己需要的
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            //获取响应内容，返回的数据格式: {"status":"success","msg":"成功","data":{"info": "example"}}
            string postContent = new StreamReader(response.GetResponseStream()).ReadToEnd();
            //结果解析,异常情况判断
            JObject json = JObject.Parse(postContent);
            var code = json["code"];
            var dataList = json["dataList"];

//post请求方式，需要请求参数时

            //参数
            Dictionary<string, string> pairs= new Dictionary<string, string>();
            pairs.Add("Id", "881ceca6-8b9b-4cf0-a349-4bd451e0f6e1");

            string token = "";//获取完Token使用Bearer+空格+Token
            string url = "";//接口地址
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Timeout = 20000;  //超时时间
            request.Method = "Post";  //请求方式
            request.KeepAlive = true; //解决GetResponse操作超时问题
            request.Headers.Add("Authorization", token); //如果接口需要鉴权, 把"token"换成自己需要的
            //设置Content-type HTTP标头的值，即请求的媒体类型
            request.ContentType = "application/json"; //json字符串
            string content = JsonConvert.SerializeObject(pairs);
            byte[] data = Encoding.UTF8.GetBytes(content);
            //写入请求的参数
            using (var stream = request.GetRequestStream())
                stream.Write(data, 0, data.Length);
            //通过HttpWebRequest的GetResponse()方法建立HttpWebResponse,强制类型转换
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string postContent = new StreamReader(response.GetResponseStream()).ReadToEnd();
            //结果解析,异常情况判断
            JObject json = JObject.Parse(postContent);
            var code = json["code"];
            var dataList = json["dataList"];