Question

我希望我的程序在C＃中检查一个网站在执行之前是否在线，我如何让我的程序ping网站并检查C＃中的响应？

Answer 1

Ping仅告诉您端口处于活动状态，它不会告诉您它是否真的是一个Web服务。

我的建议是针对网址执行HTTP HEAD请求

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("your url");
request.AllowAutoRedirect = false; // find out if this site is up and don't follow a redirector
request.Method = "HEAD";
try {
    response = request.GetResponse();
    // do something with response.Headers to find out information about the request
} catch (WebException wex)
{
    //set flag if there was a timeout or some other issues
}

这实际上不会获取HTML页面，但它会帮助您找出您需要知道的最低限度。对不起，如果代码没有编译，这只是我的头脑。

Answer 2

您已使用System.Net.NetworkInformation.Ping，请参阅下文。

var ping = new System.Net.NetworkInformation.Ping();

var result = ping.Send("www.google.com");

if (result.Status != System.Net.NetworkInformation.IPStatus.Success)
    return;

Answer 3

Digicoder代码的小注释和Ping方法的完整示例：

private bool Ping(string url)
{
    try
    {
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        request.Timeout = 3000;
        request.AllowAutoRedirect = false; // find out if this site is up and don't follow a redirector
        request.Method = "HEAD";

        using (var response = request.GetResponse())
        {
            return true;
        }
    }
    catch
    {
        return false;
    }
}

Answer 4

if (!NetworkInterface.GetIsNetworkAvailable())
{
    // Network does not available.
    return;
}

Uri uri = new Uri("http://stackoverflow.com/any-uri");

Ping ping = new Ping();
PingReply pingReply = ping.Send(uri.Host);
if (pingReply.Status != IPStatus.Success)
{
    // Website does not available.
    return;
}

Answer 5

我能想到的最简单的方法是：

WebClient webClient = new WebClient();
byte[] result = webClient.DownloadData("http://site.com/x.html");

如果网站不在线，

DownloadData将抛出异常。

可能有一种类似的方式来ping网站，但除非你每秒多次检查，否则差异不大可能会显着。

如何检查网站是否在C＃上线？

5 个答案: