每30秒重复ping

Question

我创建了一个Windows Forms应用程序以ping ip地址列表，然后使用a Timer来每秒钟重复一次ping 30。这是我使用的代码：

private System.Timers.Timer timer;

    public Form1()
    {
        InitializeComponent();

        timer = new System.Timers.Timer();
        timer.Interval = 30000;
        timer.Enabled = true;
        timer.Elapsed += button1_Click;

    }

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        pingResults.Clear();
        ipAddress.Add("10.100.1.1");
        ipAddress.Add("10.100.1.2");
        ipAddress.Add("10.100.1.3");
        ipAddress.Add("10.100.1.4");
        ipAddress.Add("10.100.1.5");
        ipAddress.Add("10.100.1.100");

        for (int i = 1; i < 7; i++)
        {
            pictureBoxList.Add((PictureBox)Controls.Find("pictureBox" + i, true)[0]);
        }

        Parallel.For(0, ipAddress.Count(), (i, loopState) =>
        {
            Ping ping = new Ping();
            PingReply pingReply = ping.Send(ipAddress[i].ToString());

            this.BeginInvoke((Action)delegate()
            {
                pictureBoxList[i].BackColor = (pingReply.Status == IPStatus.Success) ? Color.Green : Color.Red;
            });

        });

    }
private void button1_Click(object sender,ElapsedEventArgs e )
    {            
      backgroundWorker1.RunWorkerAsync();                      
    }

但是我得到了这个错误信息：

错误1'button1_Click'没有重载匹配委托'System.EventHandler'

我尝试了很多示例，但没有获得如何使用的示例Timer。这是什么问题，还是有其他方法可以重复执行Ping操作？

Answer 1

请注意，Button.Clicked并Timer.Elapsed具有不同的签名；你，可能想要

public Form1()
{
    InitializeComponent();

    timer = new System.Timers.Timer();
    timer.Interval = 30000;
    timer.Enabled = true;
    timer.Elapsed += timer_Elapsed; // not button1_Click
}

...

private void timer_Elapsed(object sender, ElapsedEventArgs e)
{            
    backgroundWorker1.RunWorkerAsync();                      
}

private void button1_Click(object sender, EventArgs e) 
{  
    backgroundWorker1.RunWorkerAsync();
}

或者，您可以timer_Elapsed借助lambda函数完全摆脱：

public Form1()
{
    InitializeComponent();

    timer = new System.Timers.Timer();
    timer.Interval = 30000;
    timer.Enabled = true;
    timer.Elapsed += (s, e) => {backgroundWorker1.RunWorkerAsync();}; 
}

...

private void button1_Click(object sender, EventArgs e) 
{  
    backgroundWorker1.RunWorkerAsync();
}