TimeIntervalEventArgs Class

Provides data for the SchedulerStorageBase.FetchAppointments event.

Namespace: DevExpress.XtraScheduler

Assembly: DevExpress.XtraScheduler.v23.2.Core.dll

NuGet Package: DevExpress.Scheduler.Core

Declaration

C#

public class TimeIntervalEventArgs :
    EventArgs

VB.NET

Public Class TimeIntervalEventArgs
    Inherits EventArgs

Remarks

The SchedulerStorageBase.FetchAppointments event can be called to retrieve appointments which satisfy the specified time interval from a datasource to the SchedulerStorageBase. The TimeIntervalEventArgs class introduces the TimeIntervalEventArgs.Interval property which specifies the time interval for which the appointments should be fetched.

An instance of the TimeIntervalEventArgs class with appropriate settings is automatically created and passed to the corresponding event’s handler.

Example

This example demonstrates how to work with a large amount of data in the Scheduler Storage. To speed up processing when there is a lot of data, the SchedulerStorageBase.FetchAppointments event should be used. Handle this event, so as to fetch only the data for the visible time interval.

To pad the time interval used to query appointments, a range of seven days is chosen. You can specify your own time range, as your need dictates.

C#

public partial class Form1 : Form
{
TimeInterval lastFetchedInterval = new TimeInterval();
// ...
private void schedulerStorage1_FetchAppointments(object sender, 
        DevExpress.XtraScheduler.FetchAppointmentsEventArgs e)
{
    DateTime start = e.Interval.Start;
    DateTime end = e.Interval.End;

    // Check if the requested interval is outside lastFetchedInterval
    if (start <= lastFetchedInterval.Start || end >= lastFetchedInterval.End)
    {
        lastFetchedInterval = new TimeInterval(start - TimeSpan.FromDays(7), 
            end + TimeSpan.FromDays(7));
        carSchedulingTableAdapter.FillBy(this.carsDBDataSet.CarScheduling, 
lastFetchedInterval.Start.Date, lastFetchedInterval.End.Date);
    }
}
}

VB.NET

Public Partial Class Form1
 Inherits Form
    Private lastFetchedInterval As TimeInterval = New TimeInterval()
' ...
    Private Sub schedulerStorage1_FetchAppointments(ByVal sender As Object, _
    ByVal e As DevExpress.XtraScheduler.FetchAppointmentsEventArgs)
        Dim start As DateTime = e.Interval.Start
        Dim [end] As DateTime = e.Interval.End

        ' Check if the requested interval is outside lastFetchedInterval
        If start <= lastFetchedInterval.Start OrElse [end] >= lastFetchedInterval.End Then
            lastFetchedInterval = New TimeInterval(start - TimeSpan.FromDays(7), _
            [end] + TimeSpan.FromDays(7))
            carSchedulingTableAdapter.FillBy(Me.carsDBDataSet.CarScheduling,  _
            lastFetchedInterval.Start.Date, lastFetchedInterval.End.Date)
        End If
    End Sub
End Class

Inheritance

Object

EventArgs

TimeIntervalEventArgs

FetchAppointmentsEventArgs