执行特定功能每隔X秒 [英] Execute specified function every X seconds

问题描述

我有一个Windows窗体应用程序用C＃编写。下面的函数，只要检查打印机是否联机：

I have a Windows Forms application written in C#. The following function checks whenever printer is online or not:

public void isonline()
{
    PrinterSettings settings = new PrinterSettings();
    if (CheckPrinter(settings.PrinterName) == "offline")
    {
        pictureBox1.Image = pictureBox1.ErrorImage;
    }
}

和更新的图像，如果打印机处于脱机状态。现在，我怎么能执行此功能 isonline（）每2秒，所以当我拔掉打印机，显示在表单上的图像（ pictureBox1 ）变成另外一个没有重新推出应用程序或做人工检查？ （例如，通过pressing刷新按钮，运行 isonline（）功能）

and updates the image if the printer is offline. Now, how can I execute this function isonline() every 2 seconds so when I unplug the printer, the image displayed on the form (pictureBox1) turns into another one without relaunching the application or doing a manual check? (eg. by pressing "Refresh" button which runs the isonline() function)

推荐答案

使用<一个href="http://msdn.microsoft.com/en-us/library/system.windows.forms.timer.aspx">System.Windows.Forms.Timer

private Timer timer1; 
public void InitTimer()
{
    timer1 = new Timer();
    timer1.Tick += new EventHandler(timer1_Tick);
    timer1.Interval = 2000; // in miliseconds
    timer1.Start();
}

private void timer1_Tick(object sender, EventArgs e)
{
    isonline()
}

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