70 lines
1.7 KiB
C#
70 lines
1.7 KiB
C#
using System;
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using System.Timers;
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using 自救器呼吸器综合检验仪;
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namespace 自救器呼吸器综合检验仪
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{
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public class MainViewModel : NotifyPropertyChangedBase
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{
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private DateTime _currentTime;
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private readonly Timer _timer;
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// 可绑定的当前时间属性
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public DateTime CurrentTime
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{
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get => _currentTime;
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set => SetField(ref _currentTime, value);
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}
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public MainViewModel()
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{
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// 初始化当前时间
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CurrentTime = DateTime.Now;
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// 创建定时器，每隔1秒触发一次
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_timer = new Timer(1000);
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_timer.Elapsed += Timer_Elapsed;
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_timer.Start();
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}
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private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
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{
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// 检查应用程序是否还在运行
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if (App.Current == null || App.Current.Dispatcher == null)
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{
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StopTimer();
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return;
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}
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try
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{
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App.Current.Dispatcher.Invoke(() =>
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{
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CurrentTime = DateTime.Now;
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});
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}
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catch
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{
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// 应用程序关闭时忽略异常
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StopTimer();
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}
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}
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public void StopTimer()
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{
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if (_timer != null)
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{
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_timer.Stop();
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_timer.Elapsed -= Timer_Elapsed;
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_timer.Dispose();
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}
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}
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// 释放定时器资源（避免内存泄漏）
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public void Dispose()
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{
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_timer?.Stop();
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_timer?.Dispose();
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}
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}
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} |