我如何处理 C# 中的 Ping 异常

Question

我创建了一个简单的方法来检查我的 Internet 连接是否有效。不幸的是，由于 System.Net.Ping.dll 中的 System.Net.NetworkInformation.PingException”，try 部分被忽略了。众所周知，问题出现在 PingReply 上。你能告诉我如何处理这个异常并允许代码正确运行以便执行 try 部分。

我的函数：

    private void ConnectionStatusChecker(object source, ElapsedEventArgs e)
    {

        Ping myPing = new Ping();
        String host = "https://www.google.com/";
        byte[] buffer = new byte[32];
        int timeout = 1000;
        PingOptions pingOptions = new PingOptions();

        Ping ping = new Ping();
        try
        {
            PingReply reply = myPing.Send(host, timeout, buffer, pingOptions);
            if (reply.Status == IPStatus.Success)
                ConnectionStatus = "Connected";
            else
                ConnectionStatus = "Disconnected";
        }
        catch (System.Net.NetworkInformation.PingException)
        {
            ConnectionStatus = "Disconnected-Exception";
        }
    }

编辑：我想在 ConnectionStatus 变量中存储有关我的 Internet 连接的信息。 Try 部分描述了断开或连接时的值。但是 PingException 不允许我检查它 - 异常会自动阻止 try 部分。问题是，如何处理这个异常，我犯的错误或来源在哪里？

Answer 1

您应该登录 InnerException 以查看实际情况：

catch (PingException ex)
{
    Console.WriteLine(ex.InnerException);
    ConnectionStatus = "Disconnected-Exception";
}

输出以下输出：

System.Net.Sockets.SocketException (11001): No such host is known.
   at System.Net.Dns.InternalGetHostByName(String hostName)
   at System.Net.Dns.GetHostAddresses(String hostNameOrAddress)
   at System.Net.NetworkInformation.Ping.GetAddressAndSend(String hostNameOrAddress, Int32 timeout, Byte[] buffer, PingOptions options)

并且 ping 命令也失败（确保结果符合预期）：

PS C:\Users\user> ping https://www.google.com/
Ping request could not find host https://www.google.com/. Please check the name and try again.

这意味着主机 https://www.google.com/ 没有为 HTTPS 启用 ICMP 回复。您可以查看 Can you get a reply from a HTTPS site using the Ping command? 以获得关于为什么会发生这种情况的良好解释。

您还可以在 System.Net.NetworkInformation.Ping.Send() 文档中验证这一点：

PingException

An exception was thrown while sending or receiving the ICMP messages. See the inner exception for the exact exception that was thrown.

改为尝试 ping 主机名 www.google.com:

Ping myPing = new Ping();
String host = "www.google.com";
byte[] buffer = new byte[32];
int timeout = 1000;
PingOptions pingOptions = new PingOptions();

string ConnectionStatus;

Ping ping = new Ping();
try
{
    PingReply reply = myPing.Send(host, timeout, buffer, pingOptions);
    if (reply.Status == IPStatus.Success)
        ConnectionStatus = "Connected";
    else
        ConnectionStatus = "Disconnected";
    }
catch (PingException ex)
{
    Console.WriteLine(ex.InnerException);
    ConnectionStatus = "Disconnected-Exception";
}

Console.WriteLine(ConnectionStatus);

无异常输出连接成功：

Connected

我如何处理 C# 中的 Ping 异常

How Can i Deal with Ping Exception in c#

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ping