C#判断网站是否能访问或者断链

C#判断网站是否能访问或者断链

使用 .Net类库 下面的 HttpRequest 类。 发送 http请求（类似CURL） ，设置上超时，判断回传http报文是不是200 就好了。不是200就是出错了
附上我用的 判断SteamAPI服务是否可用的

public bool TestIsBotSteamWebOnline() {
            string url = SteamWebBaseNSURI + "/profiles/" + _steamuser.SteamUID + "/edit";
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.Timeout = 6500;
            request.ReadWriteTimeout = 6500;
            request.CookieContainer  = this._steamuser.WebCookies;
            request.Accept = "text/javascript, text/html, application/xml, text/xml, */*";
            request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0";
            request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
            request.AllowAutoRedirect = false;
            request.Referer = url;
            request.Headers.Add("Accept-Language", "zh-CN,en;q=0.8,zh;q=0.5,en-US;q=0.3");
            HttpWebResponse response = null;// = (HttpWebResponse)request.GetResponse();
            try
            {
                response = (HttpWebResponse)request.GetResponse();
                if (response.StatusCode == HttpStatusCode.OK)
                {
                    return true;
                }
            }
            catch 
            {

            }
            finally
            {
                if (response != null)
                    response.Dispose();
            }
            return false;
        }

通过发送http请求可以判断。 httpwebrequest httpreq = null; httpwebresponse httpres = null; httpreq = (httpwebrequest)webrequest.create(url);//url是网站的地址 httpreq.timeout = 4000; httpres = (httpwebresponse)httpreq.getresponse(); if (httpres.statuscode == httpstatuscode.ok) { //能访问 } else { //不能访问 }