Question

我正在尝试使用C＃创建一个小程序，告诉我下一个地铁到期的时间。到目前为止我已对此进行了编码，但是当我更改系统时间时，Next Metro标签不会更改。任何想法出了什么问题？

namespace MetroAlarm 
{
   public partial class Form1 : Form
   {
       public Form1()
       {
           InitializeComponent();
       }

       public string time;
       public DateTime nextTime;

       private void Form1_Load(object sender, EventArgs e)
       {
          UpdateTime();
          UpdateNext();
       }

       public void UpdateTime()
       {
          time = DateTime.Now.ToString("h:mm:ss tt");
          LBLTime.Text = time;
          LBLNext.Text = nextTime;
       }

       public void UpdateNext()
       {
          if (DateTime.Now <= Metro1)
          {
             nextTime = Metro1;
          }

          if(DateTime.Now >= Metro1)
          {
             nextTime = Metro2;
          }

          if (DateTime.Now >= Metro2 )
          {
             nextTime = Metro3;
          } 

          if (DateTime.Now >= Metro3)
          {
             nextTime = Metro4;
          }

          if (DateTime.Now >= Metro4)
          {
             nextTime = Metro5;
          }

          if (DateTime.Now >= Metro5)
          {
             nextTime = LastMetro;
          }
      }

       private void UpdateClock_Tick(object sender, EventArgs e)
       {
          UpdateTime();
          UpdateNext();
       }

       DateTime Metro1 = Convert.ToDateTime("7:57:00 AM");
       DateTime Metro2 = Convert.ToDateTime("8:09:00 AM");
       DateTime Metro3 = Convert.ToDateTime("8:20:00 AM");
       DateTime Metro4 = Convert.ToDateTime("8:33:00 AM");
       DateTime LastMetro = Convert.ToDateTime("8:45:00 AM");
   }
}

Answer 1

你需要这样的Timer：

Timer timer1 = new Timer();

public Form1()
{
    InitializeComponent();
    timer1.Tick += UpdateClock_Tick;
    timer1.Start();
}

另外要在nextTime中显示LBLNext.Text，您应该使用ToShortTimeString()，如下所示：

public void UpdateTime()
{
    time = DateTime.Now.ToString("h:mm:ss tt");
    LBLTime.Text = time;
    LBLNext.Text = nextTime.ToShortTimeString();
}

闹钟不更新

1 个答案: