C# Post調用接口並傳遞json參數

        public string Post(string Url, string jsonParas)
        {
            string strURL = Url;
            //創建一個HTTP請求  
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
            //Post請求方式  
            request.Method = "POST";
            //內容類型
            request.ContentType = "application/json";

            //設置參數，並進行URL編碼 

            string paraUrlCoded = jsonParas;//System.Web.HttpUtility.UrlEncode(jsonParas);   

            byte[] payload;
            //將Json字符串轉化為字節  
            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            //設置請求的ContentLength   
            request.ContentLength = payload.Length;
            //發送請求，獲得請求流 

            Stream writer;
            try
            {
                writer = request.GetRequestStream();//獲取用於寫入請求數據的Stream對象
            }
            catch (Exception)
            {
                writer = null;
                Console.Write("連接服務器失敗!");
            }
            //將請求參數寫入流
            writer.Write(payload, 0, payload.Length);
            writer.Close();//關閉請求流
                           // String strValue = "";//strValue為http響應所返回的字符流
            HttpWebResponse response;
            try
            {
                //獲得響應流
                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數據
        }
        //調用：   string askurl = testUrl + "?sid=" + sid + "&mobi=" + mobi + "&sign=" + sign + "&msg=" + encodeMsgs;
        //string relust = Post(askurl, "");
        // 或者  string relust = Post(askurl, sid=" + sid + "&mobi=" + mobi + "&sign=" + sign + "&msg=" + encodeMsgs);

本文鏈接：https://blog.csdn.net/weixin_43343835/article/details/98959523