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, 0, (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, 0, 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;
        }