WebService 接收JSON字符串

　　晚上学习时公司的同事，暂且叫A吧，A：“我们公司XXX纺织的AM接口不通，让我看下”，我：“接口写的不是有AJAX异步请求的示例嘛，参考下，我都测试过接口，都是通的。”，A：“我走的不是AJAX，走的CS端”，我：“哦，明白了，CS端的HttpWebRequest模拟前端的AJAX请求，我之前写过一次，我写个DEMO调试看看”

排查结果如下

错误示例，因为CS没法前面加前缀：jsonData

正确的AJAX示例，前面有jsonData(因为后台获取的是jsonData中的数据，CS端这个没法传)

网上找了半天解决方法，我们可以使用上下文，获取JSON数据流，然后在将流还原回JSON字符串即可

             Stream s = HttpContext.Current.Request.InputStream;//获得json 字符流
             //还原数据流
             byte[] b = new byte[s.Length];
             s.Read(b, , (int)s.Length);
             string jsontext = Encoding.UTF8.GetString(b); //JSON字符串

cs端HttpWebRequest示例

         private void button1_Click(object sender, EventArgs e)
         {
             string res = PostWebRequest("http://XXXXXXX/webService/eCimsService.asmx/GetHullParts", "{\"ProjNo\":\"H001\",\"SectionNo\":\"C002\",Data:[]}", Encoding.UTF8);
         }
         /// <summary>
         /// Post数据接口
         /// </summary>
         /// <param name="postUrl">接口地址</param>
         /// <param name="paramData">提交json数据</param>
         /// <param name="dataEncode">编码方式(Encoding.UTF8)</param>
         /// <returns></returns>
         private static string PostWebRequest(string postUrl, string paramData, Encoding dataEncode)
         {
             string responseContent = string.Empty;
             try
             {
                 byte[] byteArray = dataEncode.GetBytes(paramData); //转化
                 HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
                 webReq.Method = "POST";
                 webReq.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
                 webReq.Accept = "*/*"; //注：调试的过程中，报415，这里可能需要修改下
                 webReq.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36";
                 webReq.ContentLength = byteArray.Length;
                 using (Stream reqStream = webReq.GetRequestStream())
                 {
                     reqStream.Write(byteArray, , byteArray.Length);//写入参数
                     //reqStream.Close();
                 }
                 using (HttpWebResponse response = (HttpWebResponse)webReq.GetResponse())
                 {
                     using (Stream myResponseStream = response.GetResponseStream())
                     {
                         using (StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8))
                         {
                             responseContent = myStreamReader.ReadToEnd().ToString();
                         }
                     }
                 }
             }
             catch (Exception ex)
             {
                 return ex.Message;
             }
             return responseContent;
         }