私は~思う~ あなたは次のようなものが欲しいと思います:
public partial class Form1 : Form
{
private DateTime dt;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
SetInitialTimer();
}
private void SetInitialTimer()
{
// Set "dt" to the BEGINNING of the CURRENT hour:
dt = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, 0, 0);
switch (nud.Value.ToString())
{
case "0.5":
case "1.5":
case "2.5":
case "3.5":
case "4.5":
case "5.5":
// start at the NEXT 1/2 hour or top of the hour:
if (DateTime.Now.Minute < 30)
{
dt = dt.AddMinutes(30);
}
else
{
dt = dt.AddHours(1);
}
break;
default: // "1", "2", "3", "4", "5", "6"
// start at the TOP of the NEXT hour:
dt = dt.AddHours(1);
break;
}
timer1.Interval = (int)dt.Subtract(DateTime.Now).TotalMilliseconds;
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
timer1.Stop();
// ... do something in here ...
SetRecurringTimer();
}
private void SetRecurringTimer()
{
dt = dt.AddMinutes((double)(nud.Value * (decimal)60));
timer1.Interval = (int)dt.Subtract(DateTime.Now).TotalMilliseconds;
timer1.Start();
}
}