我有一个用C#编写的Windows窗体应用程序。无论何时打印机在线,以下功能都会检查:
public void isonline()
{
PrinterSettings settings = new PrinterSettings();
if (CheckPrinter(settings.PrinterName) == "offline")
{
pictureBox1.Image = pictureBox1.ErrorImage;
}
}
并在打印机脱机时更新图像。现在,我怎么能每2秒执行一次这个函数isonline()
所以当我拔掉打印机时,表格上显示的图像(pictureBox1
)变成另一个图像而不重新启动应用程序或进行手动检查? (例如,通过按“刷新”按钮运行isonline()
功能)
答案 0 :(得分:96)
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();
}
您可以在InitTimer()
中致电Form1_Load()
。
答案 1 :(得分:5)
最适合初学者的解决方案是:
从工具箱中拖动一个计时器,为其命名,设置所需的间隔,并将“已启用”设置为True。然后双击Timer和Visual Studio(或者您正在使用的任何内容)将为您编写以下代码:
private void wait_Tick(object sender, EventArgs e)
{
refreshText(); // Add the method you want to call here.
}
无需担心将其粘贴到错误的代码块或类似的内容中。
答案 2 :(得分:3)
您可以通过向表单(从设计人员)添加Timer并将其设置为Tick函数来运行您的isonline函数来轻松完成此操作。
答案 3 :(得分:0)
线程化:
/// <summary>
/// Usage: var tmr = SetInterval(DoThis, 1000);
/// Updating the UI: BeginInvoke((Action)(() =>{ //Code Here; }));
/// </summary>
/// <returns>Returns a timer object which can be disposed.</returns>
public static System.Threading.Timer SetIntervalThread(Action Act, int Interval)
{
TimerStateManager state = new TimerStateManager();
System.Threading.Timer tmr = new System.Threading.Timer(new TimerCallback(_ => Act()), state, Interval, Interval);
state.TimerObject = tmr;
return tmr;
}
常规
/// <summary>
/// Usage: var tmr = SetInterval(DoThis, 1000);
/// Updating the UI: BeginInvoke((Action)(() =>{ //Code Here; }));
/// </summary>
/// <returns>Returns a timer object which can be stopped and disposed.</returns>
public static System.Timers.Timer SetInterval(Action Act, int Interval)
{
System.Timers.Timer tmr = new System.Timers.Timer();
tmr.Elapsed += (sender, args) => Act();
tmr.AutoReset = true;
tmr.Interval = Interval;
tmr.Start();
return tmr;
}
答案 4 :(得分:0)
using System;
using System.Timers;
namespace SnirElgabsi
{
class Program
{
private static Timer timer1;
static void Main(string[] args)
{
timer1 = new Timer(); //new Timer(1000);
timer1.Elpased += (sender,e) =>
{
MyFoo();
}
timer1.Interval = 1000;//miliseconds
timer1.Start();
Console.WriteLine("press any key to stop");
Console.ReadKey();
}
private static void MyFoo()
{
Console.WriteLine(string.Format("{0}", DateTime.Now));
}
}
}
答案 5 :(得分:0)
随着时间的推移,情况发生了很大变化。 您可以使用以下解决方案:
static void Main(string[] args)
{
var timer = new Timer(Callback, null, 0, 2000);
//Dispose the timer
timer.Dispose();
}
static void Callback(object? state)
{
//Your code here.
}