c#中get请求，body中携带json参数

在调用一个客户写的接口的时候，需要是get请求，并且参数是个json类型的数据，通过postman测试，没问题，可以获取到值，但是通过代码却一直都不行，就是报错说，不支持的谓词等。

后来在朋友的帮助下，找到了一个网址，最后试了居然可以了。参考网址是：https://blog.csdn.net/actionteam/article/details/119341811

通过测试，发现跟我的区别就是我少了一段代码，加上后，我之前的代码居然也可以了。

完整代码如下，其中红色字体为起作用的代码

 /// <summary>
        /// 发送get请求 参数拼接在url后面
        /// </summary>
        /// <param name="url">请求接口地址</param>
        /// <returns></returns>
        public static string HttpGet(string url, string param = "", int timeOut = 60000)
        {
            try
            {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Proxy = null;
            request.KeepAlive = false;
            request.Method = "GET";
            request.ContentType = "application/json; charset=UTF-8";
            request.AutomaticDecompression = DecompressionMethods.GZip;

            if (!string.IsNullOrEmpty(param))
            {
                byte[] data = Encoding.UTF8.GetBytes(param);
                request.ContentLength = data.Length;
                var type = request.GetType();
                var currentMethod = type.GetProperty("CurrentMethod", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(request);
                var methodType = currentMethod.GetType();
                methodType.GetField("ContentBodyNotAllowed", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(currentMethod, false);
                using (Stream reqStream = request.GetRequestStream())
                {
                    reqStream.Write(data, 0, data.Length);
                    reqStream.Close();
                }
            }

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();

            if (response != null)
            {
                response.Close();
            }
            if (request != null)
            {
                request.Abort();
            }

            return retString;
            }
            catch (Exception ex)
            {
                Log4NetHelper.GetLogger().Error(ex);
                Log4NetHelper.GetLogger().Error(url + ":" + param);
                return "-1";
            }
        }