C# 当结算日期时间剩余4分钟时启用按钮
我正在使用MvvmLight开发WPF应用程序。我想在设定的时间还剩4分钟时启用按钮。它应该在UI中自动启用。我应该使用线程来连续跟踪CurrentUTCtime和mytime的差异吗?如果是,那么如何使用此代码中的线程?这是我的密码C# 当结算日期时间剩余4分钟时启用按钮,c#,wpf,datetime,C#,Wpf,Datetime,我正在使用MvvmLight开发WPF应用程序。我想在设定的时间还剩4分钟时启用按钮。它应该在UI中自动启用。我应该使用线程来连续跟踪CurrentUTCtime和mytime的差异吗?如果是,那么如何使用此代码中的线程?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
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;
}
}
}
Datetime mytime=newdatetime(Datetime.Now.Year,Datetime.Now.Month,Datetime.Now.Day,22,0,0)
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{
得到
{
返回Open??(_Open=新的RelayCommand(ExecuteOpen、CanExecuteOpen));
}
私有void executepen()
{
_navigation.NavigationToSetBetsDialogue();
}
私人布尔CanExecuteOpen()
{
double?剩余分钟数=空;
DateTime CurrentUTCtime=DateTime.UtcNow;
remainingMinutes=mytime.Subtract(currentutcime).TotalMinutes;
如果(剩余分钟尝试使用Dispatcher:
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将以并行方式运行
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;
}
希望对您有所帮助您可以使用BackgroundWorker
完成此操作。首先,您需要初始化worker:
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;
}
确保您必须启动worker:
bgWrkr.RunWorkerAsync();
您可以在初始化.bgWrkr.RunWorkerAsync();后立即启动它。我不想使用计时器。我想使用另一个线程连续检查差异(CurrentUTCtime mytime)。如何实现这一点?这正是计时器所做的,定期执行代码(本例中为时差检查)。没有“连续”编程中的概念-尤其是在UI方面