C#测试web服务是否可用

转载：http://www.cnblogs.com/xienb/p/3443282.html

winform客户端经常需要调用webservice或者WCF进行数据交互，但是远程服务有可能不存在或者服务器不可用，客户端只能通过超时或者捕获到异常感知服务不可用。其实有一个COM借口可用快速的检测检测将要调用服务的状态。右键引用COM组件：Microsoft XML,v3.0，代码如下：

string url = "http://127.0.0.1/MySrv/MsgService.svc";
            XMLHTTP http = new XMLHTTP();
            try
            {
                http.open("GET", url, false, null, null);
                http.send(url);
                int status = http.status;
                if (status == 200)
                {
                    Console.WriteLine("成功");
                }
                else
                {
                    Console.WriteLine("不可用status:"+status.ToString());
                }
            }
            catch
            {
                Console.WriteLine("不可用");
            }

方法二：

 /// <summary>
        /// 检查WebService是否可用
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        private static bool CheckActiveWebService(string url)
        {
            try
            {
                string uri = url + "?wsdl";
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);

                request.UseDefaultCredentials = true;
                request.Method = "GET";
                request.Timeout = 5000;
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                if (response.StatusCode == HttpStatusCode.OK && response.ContentType.Substring(0, 8) == "text/xml")
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (WebException e)
            {
                System.Diagnostics.Trace.Write(e.Message);
                return false;
            }
        }