Question

我正在尝试使闹钟在特定时间响（例如，上午9:30至下午4点后每五分钟一次）。因此，我想编写一个在9:30和9:35以及...响起的代码。但最终，每种方法我都会出错。在我的代码中，我有一个包含时间的字符串，但是我不能在if（...）中使用该字符串或组来发出警报。只需使用var一个数字就可以了...，我在哪里错了？

public partial class Form1 : Form
{
    //default constructor 

    public static List<Recipe> RecipeList = new List<Recipe>();
}

public partial class Form2
{
    //default constructor 

    private void Form2_Load(object sender, Eventargs e)
    {
        RecipeList.Add("Chili con Carne");
    }
}

public class Recipe
{
    //some properties and methods... 
    {

Answer 1

private void Form1_Load(object sender, EventArgs e)
{    
    timer = new System.Timers.Timer();
    timer.Interval = 1000 * 60 * 5; //5 minutes
    timer.Elapsed += Timer_Elapsed;
    InitializeTimer(); //this method makes sure the timer starts at the correct time
}

计时器初始化方法：

private async void InitializeTimer()
{
     while (!timer.Enabled) //keep looping until timer is initialized
     {
         //if the minute is a multiple of 5 (:00, :05, ...) start the timer
         if (DateTime.Now.Minute % 5 == 0 && DateTime.Now.Second == 0)
         {
             timer.Start();
             TriggerAlarm(); //trigger the alarm initially instead of having to wait 5min
         }
         else
         {
             await Task.Delay(100);
         }            
     }        
}

您可以将时间和警报路径存储在字典中：

Dictionary<TimeSpan, string> dict = new Dictionary<TimeSpan, string>()
{
    { new TimeSpan(9, 30, 0), @"C:\Windows\Media\Time interval alarm\FiveH.wav" },
    { new TimeSpan(9, 35, 0), @"C:\Windows\Media\Time interval alarm\Whatever.wav" },
    { new TimeSpan(9, 40, 0), @"C:\Windows\Media\Time interval alarm\Whatever1.wav" },
    { new TimeSpan(9, 45, 0), @"C:\Windows\Media\Time interval alarm\Whatever2.wav" },
    //...
    { new TimeSpan(16, 0, 0), @"C:\Windows\Media\Time interval alarm\Whatever3.wav" }
};

Timer_Elapsed事件，自警报启动以来每5分钟触发一次

private void Timer_Elapsed(object sender, ElapsedEventArgs e)
{
    TriggerAlarm();
}

播放声音的方法

private static void TriggerAlarm()
{
    TimeSpan alarmTime = new TimeSpan(DateTime.Now.Hour, DateTime.Now.Minute, 0);
    if (dict.TryGetValue(alarmTime, out string alarmFile))
    {
        using (SoundPlayer player = new SoundPlayer(alarmFile))
        {
            player.Play();
        }
    }
    else
    {
        //this alarm time is not found in the dictionary, 
        //therefore, no alarm should be played at this time (e.g. 16:05:00)
    }
}

每天用C＃发出警报以在特定的恒定时间响起

1 个答案: