protected void Page_Load(object sender, EventArgs e)
{
this.Page.Title = "Recurrence Demo";
// On first load, set some defaults and bind the holiday list box to the defined recurrence holidays
if(!Page.IsPostBack)
{
txtStartDate.Text = new DateTime(DateTime.Today.Year, 1, 1).ToString("G");
txtRRULE.Text = "FREQ=DAILY;INTERVAL=5;COUNT=50";
lbResults.DataTextFormatString = CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern +
" " + CultureInfo.CurrentCulture.DateTimeFormat.LongTimePattern;
Recurrence r = new Recurrence(txtRRULE.Text);
rpRecurrence.SetRecurrence(r);
lblDescription.Text = r.ToDescription();
lbHolidays.DataSource = Recurrence.Holidays;
lbHolidays.DataBind();
}
}
/// <summary>
/// Generate instances for the specified recurrence pattern
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The event parameters</param>
protected void btnTest_Click(object sender, EventArgs e)
{
DateTimeCollection dc;
DateTime dt;
int start;
double elapsed;
try
{
lblCount.Text = lblDescription.Text = String.Empty;
if(!DateTime.TryParse(txtStartDate.Text, CultureInfo.CurrentCulture, DateTimeStyles.None, out dt))
{
lblCount.Text = "Invalid date/time or RRULE format";
return;
}
// Define the recurrence rule by parsing the text
Recurrence r = new Recurrence(txtRRULE.Text);
r.StartDateTime = dt;
// Synch the pattern control to the RRULE if not called by the pattern's test button
if(sender != btnTestPattern)
rpRecurrence.SetRecurrence(r);
// Use some limitations to prevent overloading the server or timing out the page if possible
if(r.Frequency > RecurFrequency.Hourly && (r.MaximumOccurrences == 0 || r.MaximumOccurrences > 5000))
{
r.MaximumOccurrences = 5000;
txtRRULE.Text = r.ToString();
}
if(r.MaximumOccurrences != 0)
{
if(r.MaximumOccurrences > 5000)
{
r.MaximumOccurrences = 5000;
txtRRULE.Text = r.ToString();
}
}
else
if(r.Frequency == RecurFrequency.Hourly)
{
if(r.RecurUntil > r.StartDateTime.AddYears(5))
{
r.RecurUntil = r.StartDateTime.AddYears(5);
txtRRULE.Text = r.ToString();
}
}
else
if(r.RecurUntil > r.StartDateTime.AddYears(50))
{
r.RecurUntil = r.StartDateTime.AddYears(50);
txtRRULE.Text = r.ToString();
}
// Time the calculation
start = System.Environment.TickCount;
dc = r.InstancesBetween(r.StartDateTime, DateTime.MaxValue);
elapsed = (System.Environment.TickCount - start) / 1000.0;
// Bind the results to the list box
lbResults.DataSource = dc;
lbResults.DataBind();
lblCount.Text = String.Format("Found {0:N0} instances in {1:N2} " +
"seconds ({2:N2} instances/second)", dc.Count, elapsed, dc.Count / elapsed);
// Show a description of the pattern
lblDescription.Text = r.ToDescription();
}
catch(Exception ex)
{
lblCount.Text = ex.Message;
}
}
/// <summary>
/// Describe the recurrence rule by using the ToDescription method
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The event arguments</param>
private void btnDescribe_Click(object sender, EventArgs e)
{
try
{
Recurrence r = new Recurrence(txtRRULE.Text);
MessageBox.Show(r.ToDescription(), "Recurrence Description");
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}