如何在后台調用接口

 string url = "http://localhost:12083/api/common/GetVerifyCode";
                string strType = "application/x-www-form-urlencoded";
                string strPar = "userName=18382565651";//拼接參數
                HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);//創建請求地址
                httpWebRequest.ContentType = strType;//設置http標頭
                httpWebRequest.Method = "POST";//設置提交方式
                httpWebRequest.Timeout = 600000;//設置過期時間

                byte[] btBodys = Encoding.UTF8.GetBytes(strPar);//重寫字符串為字節碼
                httpWebRequest.ContentLength = btBodys.Length;
                httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);

                HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();//接收返回內容
                StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());//讀寫為流
                string responseContent = streamReader.ReadToEnd();//返回的數據

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