从http长寿命web服务获取实时数据

本文关键字：服务 获取 实时 数据 web http | 更新日期: 2023-09-27 18:26:19

我有一个http长寿web服务。若它有新的数据，它将使用http GET推送到客户端。如何使用HttpWebRequest c#从http长寿命web服务接收实时数据？

从http长寿命web服务获取实时数据

如果你想使用get获取数据，你可以使用这个（当你使用GetResponse时，响应是同步的）：

 public string GetMessageViaGet(string endPoint)
        {
            HttpWebRequest request = CreateWebRequest(endPoint);
            using (var response = (HttpWebResponse)request.GetResponse())
            {
                var responseValue = string.Empty;
                if (response.StatusCode != HttpStatusCode.OK)
                {
                    string message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
                    throw new ApplicationException(message);
                }
                // grab the response  
                using (var responseStream = response.GetResponseStream())
                {
                    using (var reader = new StreamReader(responseStream))
                    {
                        responseValue = reader.ReadToEnd();
                    }
                }
                return responseValue;
            }
        }
        private HttpWebRequest CreateWebRequest(string endPoint)
        {
            var request = (HttpWebRequest)WebRequest.Create(endPoint);
            request.Method = "GET";
            request.ContentLength = 0;
            request.ContentType = "text/xml";
            return request;
        }

如果您想通过post获取数据，请执行以下

   public string GetMessageViaPost(string endPoint, string paramtersJson)
        {
            string responseValue;
            byte[] bytes = Encoding.UTF8.GetBytes(paramtersJson);
            HttpWebRequest request = CreateWebRequest(endPoint, bytes.Length);
            using (var requestStream = request.GetRequestStream())
            {
                requestStream.Write(bytes, 0, bytes.Length);
            }
            using (var response = (HttpWebResponse)request.GetResponse())
            {
                if (response.StatusCode != HttpStatusCode.OK)
                {
                    string message = String.Format("POST failed. Received HTTP {0}", response.StatusCode);
                    throw new ApplicationException(message);
                }
                // grab the response  
                using (var responseStream = response.GetResponseStream())
                {
                    using (var reader = new StreamReader(responseStream))
                    {
                        responseValue = reader.ReadToEnd();
                    }
                }
            }
            return responseValue;
        }
        private HttpWebRequest CreateWebRequest(string endPoint, Int32 contentLength)
        {
            var request = (HttpWebRequest)WebRequest.Create(endPoint);
            request.Method = "POST";
            request.ContentLength = contentLength;
            request.ContentType = "application/json";// "application/x-www-form-urlencoded";
            return request;
        }
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