在结算日期时间还剩4分钟时启用按钮

本文关键字：4分钟 启用 按钮 日期 时间 | 更新日期: 2023-09-27 18:27:30

我正在使用MvvmLight开发WPF应用程序。我想在结算时间还剩4分钟时启用按钮。它应该在UI中自动启用。我应该使用线程来持续跟踪CurrentUTCtime和mytime的差异吗？如果是，那么如何将线程与此代码一起使用？这是我的密码。

Datetime mytime = new DateTime(DateTime.Now.Year,DateTime.Now.Month,DateTime.Now.Day,22,0,0)
public RelayCommand Open
{
    get 
    { 
        return Open?? (_open= new RelayCommand(ExecuteOpen, CanExecuteOpen)); 
    }
    private void ExecuteOpen()
    {
        _navigation.NavigationToSetBetsDialogue();
    }
    private bool CanExecuteOpen()
    {
        double? remainingMinutes = null;
        DateTime CurrentUTCtime = DateTime.UtcNow;
        remainingMinutes = mytime .Subtract(CurrentUTCtime).TotalMinutes;
        if (remainingMinutes <= 4)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

在结算日期时间还剩4分钟时启用按钮

尝试使用DispatcherTimer:

        private DispatcherTimer _Timer = new DispatcherTimer();
        private bool _CanExecute;
        private void StartTimer()
        {
            var mytime = new DateTime( DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 22, 0, 0 );
            var interval = DateTime.UtcNow - mytime - TimeSpan.FromMinutes( 4 );
            _Timer.Interval = interval;
            _Timer.Tick += Timer_Tick;
        }
        private void Timer_Tick( object sender, EventArgs e )
        {
            _Timer.Tick -= Timer_Tick;
            _CanExecute = true;
            CommandManager.InvalidateRequerySuggested();
        }
        public ICommand Open
        {
            get { return new RelayCommand( ExecuteOpen, () => _CanExecute ); }
        }

您可以使用can execute并检查运行时间，不需要单独的线程，因为can execute无论如何都会并行运行。。。

private DateTime _startTime;
private void StartCommandHandler(object obj)
    {
        _startTime = DateTime.Now;
    }
 private bool CanEnableButton(object arg)
    {
        return _startTime != DateTime.MinValue && DateTime.Now.Subtract(_startTime).Minutes >= 4;
    }

希望它能帮助

您可以使用BackgroundWorker执行此操作。首先你需要启动工人：

        BackgroundWorker bgWrkr = new BackgroundWorker();
        bgWrkr.DoWork += new DoWorkEventHandler(bgWrkrDoWork);
        bgWrkr.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgWrkrRunWorkerCompleted);

然后实现事件的处理程序。DoWork:

void bgWrkrDoWork(object sender, DoWorkEventArgs e)
{
    while (mytime.Subtract(DateTime.UtcNow).TotalMinutes >= 4){ }
}

和RunWorkerCompleted:

void bgWrkrRunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    button.IsEnabled = true;
}

当然你必须启动工人：

bgWrkr.RunWorkerAsync();

您可以在初始化.bgWrkr.RunWorkerSync（）后立即启动它；

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