Question

所以我在下面有这个代码。我发现了一个预览帖，并从这里开始工作。但由于某种原因，它不会循环并更新具有回复状态的单元格。它只更新列表中的最后一个ip。

private static void ping_PingCompleted(object sender, PingCompletedEventArgs e)
{
    var reply = e.Reply;
    DataGridViewRow row = e.UserState as DataGridViewRow;
    DataGridViewCell PingStat = row.Cells["cPing"];
    if (!(reply == null))
    {
        switch (reply.Status)
        {
            case IPStatus.Success:
               PingStat.Value = string.Format("Reply from {0}: bytes={1} time={2}ms TTL={3}", reply.Address, reply.Buffer.Length, reply.RoundtripTime, reply.Options.Ttl);
               break;
            case IPStatus.TimedOut:
               PingStat.Value = "Connection has timed out...";
               break;
            default:
               PingStat.Value = string.Format("Ping failed: {0}", reply.Status.ToString());
               break;
        }
    }
}


private void bPing_Click(object sender, EventArgs e)
{
    String ip;
    Ping ping = new Ping();
    foreach (DataGridViewRow row in dgvData.Rows)
    {
        if(!row.IsNewRow)
        {
            ip = row.Cells["cIPAddress"].Value.ToString();

            ping.PingCompleted += new PingCompletedEventHandler(ping_PingCompleted);

            ping.SendAsync(ip, 1000, row);

            System.Threading.Thread.Sleep(5);
        }
    }
}

我做错了什么？我想添加行ping.SendAsync它会跟踪所有回复相应的ip / row？

我正在使用的更新代码

        private static void ping_PingCompleted(object sender, PingCompletedEventArgs e)
    {
        var reply = e.Reply;
        DataGridViewRow row = e.UserState as DataGridViewRow;
        DataGridViewCell PingStat = row.Cells["cPing"];
        if (reply != null)
        {
            switch (reply.Status)
            {
                case IPStatus.Success:
                    PingStat.Value = string.Format("Reply from {0}: bytes={1} time={2}ms TTL={3}", reply.Address, reply.Buffer.Length, reply.RoundtripTime, reply.Options.Ttl);
                    break;
                case IPStatus.TimedOut:
                    PingStat.Value = "Connection has timed out...";
                    break;
                default:
                    PingStat.Value = string.Format("Ping failed: {0}", reply.Status.ToString());
                    break;
            }
        }
    }
    private void bPing_Click(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in dgvData.Rows)
        {
            if (!row.IsNewRow)
            {
                Debug.WriteLine("Rows");
                String ip;
                Ping ping = new Ping();
                ip = row.Cells["cIPAddress"].Value.ToString();
                ping.PingCompleted += new PingCompletedEventHandler(ping_PingCompleted);

                ping.SendAsync(ip, 1000, row);

                System.Threading.Thread.Sleep(5);
            }
        }
    }

Answer 1

我认为问题是你有一个Ping和一个IP，这些一直在重置直到最后一行。如果你将这些变量移动到foreach循环中，那么DataGridView中的每一行都将拥有“自己的”Ping和ip，因此你不会有每行的问题有效地撤消前一行。

private void bPing_Click(object sender, EventArgs e)
{
    foreach (DataGridViewRow row in dgvData.Rows)
    {
        if(!row.IsNewRow)
        {
            String ip;
            Ping ping = new Ping();
            ip = row.Cells["cIPAddress"].Value.ToString();
            ping.PingCompleted += new   PingCompletedEventHandler(ping_PingCompleted);

            ping.SendAsync(ip, 1000, row);

            System.Threading.Thread.Sleep(5);
        }
    }
}

另外，我不熟悉“Ping”，但你可能想知道它是否需要被处理掉，或者把它放在Using循环中。

此外，无需将行强制转换为行。

Answer 2

这个怎么样：

private void bPing_Click(object sender, EventArgs e) {
    foreach (DataGridViewRow row in dgvData.Rows) {
        try {
            Ping pinger = new Ping();
            PingReply reply = await pinger.SendPingAsync(row.Cells["cIPAddress"].Value.ToString(),1000);
            switch (reply.Status) {
                // do your stuff here
            }
        } catch (PingException) {
            // Handle exception here
        }
    }
}

C＃Windows Forms ping.Send与DataGridView的Async问题

2 个答案: