闹钟定时器
我想做一个简单的程序，让它在特定的时间运行。这是我的代码：
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Alarm ft = new Alarm(dateTimePicker1.Value);
}
}
public class Alarm
{
public Timer reminder = new Timer();
public DateTime RemindAt;
public Alarm(DateTime time)
{
RemindAt = time;
reminder.Interval = (int)(RemindAt - DateTime.Now).TotalMilliseconds;
reminder.Start();
reminder.Tick += new EventHandler(reminder_Tick);
}
void reminder_Tick(object sender, EventArgs e)
{
if (RemindAt <= DateTime.Now)
{
reminder.Dispose();
MessageBox.Show("W: " + RemindAt.ToString("dd MMMM yyyy, HH:mm:ss") + "\n" + "N: " + DateTime.Now.ToString("dd MMMM yyyy, HH:mm:ss") + "\n\n");
}
}
正如你所看到的，我使用计时器，但它似乎非常不准确，我不知道为什么。以下是 6 个警报的屏幕截图：https://i.sstatic.net/IGzIh.png
其中一半是错误的。 W 代表何时应该起作用，N 代表现在。有时差异可能很大，为什么呢？如何解决这个问题，或者也许有更好的方法来发出简单的警报？
I want to make a simple program to make it run in the specific time. Here is my code:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Alarm ft = new Alarm(dateTimePicker1.Value);
}
}
public class Alarm
{
public Timer reminder = new Timer();
public DateTime RemindAt;
public Alarm(DateTime time)
{
RemindAt = time;
reminder.Interval = (int)(RemindAt - DateTime.Now).TotalMilliseconds;
reminder.Start();
reminder.Tick += new EventHandler(reminder_Tick);
}
void reminder_Tick(object sender, EventArgs e)
{
if (RemindAt <= DateTime.Now)
{
reminder.Dispose();
MessageBox.Show("W: " + RemindAt.ToString("dd MMMM yyyy, HH:mm:ss") + "\n" + "N: " + DateTime.Now.ToString("dd MMMM yyyy, HH:mm:ss") + "\n\n");
}
}
As you can seem I use timers, but it seems pretty inaccurate, I have no idea why. Here is the screenshot of 6 alarms: https://i.sstatic.net/IGzIh.png
Half of them are wrong. W stands for when it should work, N stands for now. The difference can be huge sometimes, why is that? How to fix that, or maybe there is a better way to make a simple alarm?
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评论（2）
System.Windows.Forms.Timer并不精确，尤其是对于大量数据。不要计算Interval的值，而是将其设置为某个常量，例如1000。System.Windows.Forms.Timers aren't precise, especially for large numbers. Instead of calculating the value forInterval, set it to something constant, say1000.查看 Windows 任务时间表
基本上创建您的 EXE 并让 Windows 处理运行时间。
如何通过 UI 执行此操作
以编程方式安装
Take a Look at Windows Task Schedular
Basically create your EXE and let Windows handle the time to run.
How to do it via UI
Install it Programmatically