如何检查DateTime是否已初始化？ [英] How do you check if DateTime is initialized?

问题描述

如果启动Datetime，我需要帮助制作一个每秒检查一次的代码。如果它已启动，它应该关闭已经运行的功能。我知道dispatchertimer但我希望它在后台运行该线程。原因是因为我有一个直到日期时间开始播放的媒体播放器，导致电影每1秒重启一次。



如果你们能做到的话，我会非常感谢帮助我，有点绝望...

I need help with making a code that checks every second if Datetime is started. If it is started it should close the already running function. I know dispatchertimer but I want it to run the thread in background. The reason is because I have a mediaplayer that plays till datetime is started, causing the movie to restart every 1 second.

I would be very thank full if you guys could help me, a little bit desperate...

        Dictionary<string, string> listBox3Dict = new Dictionary<string, string>();
        private bool listbox3job()
        {
            AxWMPLib.AxWindowsMediaPlayer axWmp =
wfh.Child as AxWMPLib.AxWindowsMediaPlayer;
            DateTime? start = DateTimePicker1.Value;
            DateTime? end = DateTimePicker2.Value; // This. End date. If end date. Stop movie.
            DateTime now = DateTime.Now;

            if (start == null || end == null)
            {
            }
            else if (now >= start.Value && now <= end.Value)
                {
                    foreach (var selected in listBox3.Items)
                    {
                        string s = selected.ToString();

                        if (listBox3Dict.ContainsKey(s))
                        {
                            axWmp.URL = (listBox3Dict[s]);
                        }
                    }

                return true;
            }
            return false;
        }

推荐答案

您需要使用计时器 [ ^ ]



示例：

http：/ /social.msdn.microsoft.com/Forums/en-US/winforms/thread/43daf8b2-67ad-4938-98f7-cae3eaa5e63f/ [ ^ ]

http://www.dotnetperls.com/timer [ ^ ]

http://forum.co decall.net/topic/65434-c-working-with-timers/ [ ^ ]

微秒和毫秒C＃定时器 [ ^ ]

所有关于.NET计时器 - 比较 [ ^ ]

C＃中的高性能计时器 [ ^ ]

You need to use Timer[^]

Examples:
http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/43daf8b2-67ad-4938-98f7-cae3eaa5e63f/[^]
http://www.dotnetperls.com/timer[^]
http://forum.codecall.net/topic/65434-c-working-with-timers/[^]
Microsecond and Millisecond C# Timer[^]
All about .NET Timers - A Comparison[^]
High-Performance Timer in C#[^]

小代码片段ab计时器。希望有所帮助。

Little code snippet about timer. Hope that help.

Timer timer;
int secondsToPlay;
private void StartPlay_Click(object sender, EventArgs e)
{
    timer = new Timer();
    timer.Tick += new EventHandler(timer_Tick);
    timer.Interval = 1000;
    DateTime Start = dateTimePicker1.Value;
    DateTime End = dateTimePicker2.Value;
    TimeSpan total = End - Start;
    secondsToPlay = (int)total.TotalSeconds;
    // Start video etc ...
    timer.Start();
}

void timer_Tick(object sender, EventArgs e)
{
    secondsToPlay--;
    if (secondsToPlay <= 0)
    {
        // Stop video etc ...
        timer.Stop();
    }
}

这篇关于如何检查DateTime是否已初始化？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！