如何检查与.NET，C＃，WPF互联网连接 [英] How to check internet connection with .NET, C#, WPF

问题描述

我使用.NET，C＃和WPF，我需要检查连接是否被打开到一定的网址，我不能得到任何code的工作，我发现在互联网上。

I am using .NET, C# and WPF and I need to check whether the connection is opened to a certain URL and I can't get any code to work that I have found on the internet.

我想：

        Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        try
        {
            IAsyncResult result = socket.BeginConnect("localhost/myfolder/", 80, null, null);
            bool success = result.AsyncWaitHandle.WaitOne(3000, true);
            if (!success)
            {
                MessageBox.Show("Web Service is down!");
            }
            else MessageBox.Show("Everything seems ok");
        }
        finally
        {
            socket.Close();
        }

不过，我总是得到消息，一切都很好，即使我关闭了我的本地Apache服务器。

But i always get the message that everything is ok even if i shut down my local apache server.

我也试过：

        ing ping = new Ping();
        PingReply reply;
        try
        {
            reply = ping.Send("localhost/myfolder/");
            if (reply.Status != IPStatus.Success) MessageBox.Show("Internet is down!");
            else MessageBox.Show("Seems OK");
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error: "+ex.Message);
        }

但是，这总是给一个例外（平似乎只有工作ping服务器，所以本地主机的作品，但本地主机/ MyFolder中/犯规）

But this always gives an exception (ping seems to work only pinging the server, so localhost works but localhost/myfolder/ doesnt)

请如何检查连接，所以它会为我工作？

Please how to check the connection so it would work for me?

推荐答案

在最后，我用我自己的code：

In the end I used my own code:

    private bool CheckConnection(String URL)
    {
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
            request.Timeout = 5000;
            request.Credentials = CredentialCache.DefaultNetworkCredentials;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            if (response.StatusCode == HttpStatusCode.OK) return true;
            else return false;
        }
        catch
        {
            return false;
        }
    }

这是有趣的事情是，当服务器已关闭（我关掉我的Apache）IM没有得到任何HTTP状态，但将引发异常。但这部作品不够好：）

An interesting thing is that when the server is down (i turn off my apache) i m not getting any http status but an exception is thrown. But this works good enough :)

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