1) create new project with a radScheduler

2) add a new appointment with a subject of: <>

3) program will crash with System.InvalidOperationException: 'Collection was modified after the enumerator was instantiated.'

The program will crash even if you have additional text before the "<>" but having text after it will allow the program to continue running however, none of the text after the "<>" will display.

Hello,

I found an issue when retrieving appointments using MultiDayView.GetAppointmentsInInterval

The issue occurs when creating a new appointment where AllDay is set to true
In the appointment, the Start and End date is automatically both set to the same value
When adding the appointment to the MultidayView and retrieving the appointments in interval (interval is set to 1 minute) the Appointment is not returned.
I guess the call only uses the Start and End date and not using the AllDay value

Grtz Patrick

Here is the code snippet:

    Sub New()

        InitializeComponent()

        Dim culture As CultureInfo = New CultureInfo("en-US")
        culture.DateTimeFormat.FirstDayOfWeek = DayOfWeek.Monday
        culture.DateTimeFormat.CalendarWeekRule = CalendarWeekRule.FirstFourDayWeek
        Me.RadScheduler1.Culture = culture

        Me.RadScheduler1.ActiveViewType = Telerik.WinControls.UI.SchedulerViewType.Timeline
        Dim timelineView As SchedulerTimelineView = Me.RadScheduler1.GetTimelineView()
        Dim scale As Timescales = Timescales.Weeks
        timelineView.ShowTimescale(scale) 

    End Sub
 

    Private Sub RadForm1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim baseDate As DateTime = DateTime.Today
        Dim start As DateTime() = New DateTime() {baseDate.AddHours(14.0), baseDate.AddDays(1.0).AddHours(9.0), baseDate.AddDays(2.0).AddHours(13.0)}
        Dim [end] As DateTime() = New DateTime() {baseDate.AddHours(16.0), baseDate.AddDays(1.0).AddHours(15.0), baseDate.AddDays(2.0).AddHours(17.0)}



        Dim appointment As Appointment = Nothing
        For i As Integer = 0 To 2
            appointment = New Appointment(start(i), [end](i), "A" & i, "D" & i, "L" & i) 
            Me.RadScheduler1.Appointments.Add(appointment)
        Next

        Me.RadScheduler1.ActiveView.StartDate = New DateTime(2020, 10, 11)
    End Sub

You will notice that if the StartDate is changed the appointments occupy the wrong cells until you scroll horizontally and the view is updated.

Hi,

I am using the CalHelper (as suggested by this) in order to convert RecurrenceRule back and forth to string in order to persist on the database.

With the minutely recurrence rule, it seems like the conversion is not done correctly.

Please check the below code:

            var recurrenceRule = new MinutelyRecurrenceRule();
            recurrenceRule.Start = new DateTime(2020, 4, 1);
            recurrenceRule.Interval = 30;
            recurrenceRule.End = new DateTime(2020, 4, 1, 2, 0, 0);
            var qString = CalHelper.RecurrenceRuleToString(recurrenceRule);
            RecurrenceRule recurrenceRule1;
            CalHelper.TryParseRecurrenceRule(qString, out recurrenceRule1);// recurrenceRule1 will be null

Is there a way to fix this issue?

Thanks,

Please run the attached sample project and follow the steps illustrated in the gif file. Not always the selected appointment is dragged.

Workaround:

        public class CustomSchedulerInputBheavior : SchedulerInputBehavior
        {
            public CustomSchedulerInputBheavior(RadScheduler scheduler) : base(scheduler)
            {
            }

            Point mouseDownPosition = Point.Empty;
            public override bool HandleMouseDown(MouseEventArgs args)
            {
                mouseDownPosition = args.Location;
                return base.HandleMouseDown(args);
            }
            public override bool HandleMouseMove(MouseEventArgs args)
            {
                SchedulerCellElement cell = this.Scheduler.ElementTree.GetElementAtPoint(args.Location) as SchedulerCellElement;

                AppointmentElement appointment = this.Scheduler.ElementTree.GetElementAtPoint(args.Location) as AppointmentElement;
                if (appointment == null)
                {
                    appointment = this.Scheduler.ElementTree.GetElementAtPoint(this.mouseDownPosition) as AppointmentElement;
                }

                if (this.Scheduler.Behavior.ItemCapture != null && (this.Scheduler.Behavior.ItemCapture.Parent is RadScrollBarElement ||
                    this.Scheduler.Behavior.ItemCapture is RadScrollBarElement))
                {
                    return false;
                }

                if (this.Scheduler.Capture && args.Button == MouseButtons.Left)
                {
                     appointment = this.Scheduler.ElementTree.GetElementAtPoint(this.mouseDownPosition) as AppointmentElement;

                    FieldInfo fi = typeof(SchedulerInputBehavior).GetField("selecting", BindingFlags.Instance| BindingFlags.NonPublic);
                    bool selecting = (bool)fi.GetValue(this);
                    if (selecting)
                    {
                        if (cell != null && cell.AllowSelection && args.Button == MouseButtons.Left)
                        {
                            this.SelectCell(cell, true);
                        }
                    }
                    else if (this.Scheduler.SchedulerElement.ResizeBehavior.IsResizing)
                    {
                        this.Scheduler.SchedulerElement.ResizeBehavior.Resize(args.Location);
                    }
                    else if (appointment != null && IsRealDrag(args.Location))
                    {
                        this.Scheduler.Capture = false;
                        this.Scheduler.DragDropBehavior.BeginDrag((SchedulerVisualElement)appointment.Parent, appointment);
                        return true;
                    }
                }
                else
                {
                    if (appointment != null)
                    {
                        this.Scheduler.SchedulerElement.ResizeBehavior.RequestResize(appointment, (SchedulerVisualElement)appointment.Parent, false);
                    }
                    else
                    {
                        this.Scheduler.Cursor = Cursors.Default;
                    }
                }

                return false;
            }
            private void SelectCell(SchedulerCellElement cell, bool extend)
            {
                this.Scheduler.SelectionBehavior.SelectCell(cell, extend);
            }
        }

this.radScheduler1.SchedulerInputBehavior = new CustomSchedulerInputBheavior(this.radScheduler1);

Currently, I’m using the Radscheduler MultiDayView to create a “two week” view in which the end user has the possibility to choose if he wants to see weekend days or not.
When this view is used in combination with appointments spanning multiple days and the display of the weekend days, every thing works fine (with_weekend.png). The appointment starts at 06/21/19 05:00 and ends 06/24/19 21:05.
However, if weekend days are not shown in this view (without_weekend.png), part of the same appointment is shown on 06/25/19 and the end time on 06/24/19 is also incorrect.

How can I solve this? It is not an option to show it as an “All day appointment” since the customer wants to know the exact start and end time.

Hi,

using a RadScheduler into a desktop application. It seems like, on mouse-down event happening into a cell of the first row, the grid of the scheduler is shifting down of a row, resulting in the mouse handle being on the previous row's cell. No mouse wheel scrolled, no other mouse movement. Just one left-click. The result is that on mouse-up we are in a different cell and our event-handler is getting confused.

Sorry for not having any code snippet, I just attach a video of what's happening. Consider that I have only positioned the mouse on the cell at 8am and left-clicked. Tested also with version 2019.2.508 (even though in our app we are still using 2016.2.608).

Thanks in advance and best regards,

Emanuele Nava
Apogeo srl
Italy

Hello,

We have developed an ASP.NET application and a WinForms application that both uses Telerik RadScheduler. The applications share the same data.

We have set EnableExactTimeRendering = true to prevent appointments to falsely be displayed as collisions.

Our problem is that appointments with short durations (0-4 minutes) are totally invisible in the WinForms Scheduler. In the ASP.NET scheduler all appointments are visible. An appointment with no duration (0 minutes) is shown as 30min appointment in ASP.NET while 1-minute appointments are shown as a thin line which is ok as we use tooltips for all appointments.

How can we make all appointments visible in WinForms and still use EnableExactTimeRendering? Of course, the rendering will not be exact for small durations but that is better than not showing the appointments at all. We would like to set a minimum size for appointments.

Best regards,
Daniel Gidlöf

To reproduce:  

1.Change the first day of week to Monday:

            SchedulerMonthView view = new SchedulerMonthView();
            CultureInfo ci = new CultureInfo("en-US");
 
            ci.DateTimeFormat.FirstDayOfWeek = DayOfWeek.Monday;
            view.CurrentCulture = ci;
            this.radScheduler1.ActiveView = view;
2. Create an appointment with a recurrence rule illustrated in the attached screenshot. Imagine that today is Wednesday and the recurrence rule starts on Monday from the same week.
As a result, you will notice that the WeeklyRecurrenceRule.FirstDayOfWeek is not set and the appointment occurs on the wrong Sundays. Refer to the attached screenshot. 

Workaround:

        private void radScheduler1_AppointmentAdded(object sender, AppointmentAddedEventArgs e)
        {
            if (e.Appointment.RecurrenceRule != null)
            {
                WeeklyRecurrenceRule r = e.Appointment.RecurrenceRule as WeeklyRecurrenceRule;
                r.FirstDayOfWeek = DayOfWeek.Monday;
            }
        }

How to reproduce: check the attached (video radscheduler-selection-incorrect.gif)
 public RadForm1()
 {
     InitializeComponent();

     Appointment appointment = new Appointment(DateTime.Today.AddHours(13), TimeSpan.FromHours(1), "Test Appointment");
     this.radScheduler1.Appointments.Add(appointment);

     for (int i = 0; i < 25; i++)
     {
         appointment = new Appointment(DateTime.Today.AddHours(24), TimeSpan.FromHours(1), "AllDay: " + i);
         appointment.AllDay = true;
         this.radScheduler1.Appointments.Add(appointment);
     }
     this.radScheduler1.AllowAppointmentsMultiSelect = true;
 }

Workaround: create a custom input behavior

this.radScheduler1.SchedulerInputBehavior = new CustomSchedulerInputBehavior(this.radScheduler1);

public class CustomSchedulerInputBehavior : SchedulerInputBehavior
{
    public CustomSchedulerInputBehavior(RadScheduler scheduler) 
        : base(scheduler)
    {
    }

    public override bool HandleMouseWheel(MouseEventArgs args)
    {
        if (!this.Scheduler.AllowMouseWheelSupport)
            return false;

        bool scrolled = false;

        if (this.Scheduler.SelectionBehavior.IsAllDayAreaSelection || this.IsLastSelectedAppointmentAllDay(this.Scheduler.SelectionBehavior.SelectedAppointments))
        {
            if (this.Scheduler.GroupType == GroupType.Resource)
            {
                SchedulerDayViewGroupedByResourceElement grouped = this.Scheduler.ViewElement as SchedulerDayViewGroupedByResourceElement;
                IList<SchedulerDayViewElement> childViews = grouped != null ? grouped.GetChildViewElements() : null;
                if (childViews != null && childViews.Count > 0)
                {
                    RadScrollBarElement scroll = childViews[childViews.Count - 1].AllDayHeaderElement.ScrollBar;
                    if (scroll.Visibility != ElementVisibility.Collapsed)
                    {
                        int newValue = scroll.Value - childViews[childViews.Count - 1].AllDayHeaderElement.HeaderHeight * Math.Sign(args.Delta);
                        newValue = Math.Max(Math.Min(newValue, scroll.Maximum - scroll.LargeChange + 1), scroll.Minimum);
                        scroll.Value = newValue;
                        scrolled = true;
                    }
                }
            }
            else
            {
                SchedulerDayViewElement dayView = this.Scheduler.ViewElement as SchedulerDayViewElement;
                RadScrollBarElement scroll = dayView != null ? dayView.AllDayHeaderElement.ScrollBar : null;

                if (scroll != null && scroll.Visibility != ElementVisibility.Collapsed)
                {
                    int newValue = scroll.Value - dayView.AllDayHeaderElement.HeaderHeight * Math.Sign(args.Delta);
                    newValue = Math.Max(Math.Min(newValue, scroll.Maximum - scroll.LargeChange + 1), scroll.Minimum);
                    scroll.Value = newValue;
                    scrolled = true;
                }
            }
        }

        if (scrolled)
        {
            return false;
        }

        if (args.Delta > 0)
        {
            this.Scheduler.ViewElement.Scroll(true);
        }
        else
        {
            this.Scheduler.ViewElement.Scroll(false);
        }
        return false;
    }

    private bool IsLastSelectedAppointmentAllDay(ReadOnlyCollection<IEvent> selectedAppointments)
    {
        if (selectedAppointments.Count > 0)
        {
            return selectedAppointments[selectedAppointments.Count - 1].AllDay;
        }

        return false;
    }

}

To reproduce:
        Me.RadScheduler1.ActiveViewType = Telerik.WinControls.UI.SchedulerViewType.Timeline
        Dim timelineView As SchedulerTimelineView = Me.RadScheduler1.GetTimelineView()
        Dim currentScaling As SchedulerTimescale = timelineView.GetScaling()
        currentScaling.DisplayedCellsCount = 100

Try to scroll horizontally. Then, change the currentScaling.DisplayedCellsCount  property to 50 and try to scroll again. You will notice a considerable difference.

Workaround: reduce the number of the displayed visual cell elements by the DisplayedCellsCount.

Workaround: create a custom Appointment and override the PaintRecurrenceIcon method

Public Class MyAppointmentElement
    Inherits AppointmentElement

    Public Sub New(scheduler As RadScheduler, view As SchedulerView, appointment As IEvent)
        MyBase.New(scheduler, view, appointment)
    End Sub

    Public Overrides Sub PaintRecurrenceIcon(graphics As IGraphics)

        If Not Me.Recurring Then
            Return
        End If

        Dim icon As Image = DirectCast(GetType(AppointmentElement).GetMethod("GetRecurrenceIcon", BindingFlags.Instance Or BindingFlags.NonPublic).Invoke(Me, Nothing), Image)

        If icon Is Nothing Then
            Return
        End If

        SyncLock icon
            Dim clientRect As RectangleF = Me.GetClientRectangle(Me.Bounds.Size)
            Dim x As Integer = CInt(clientRect.X) + CInt(clientRect.Width) - icon.Width

            If Me.RightToLeft Then
                x = CInt(clientRect.X)
            End If

            Dim imageRect As Rectangle = New Rectangle(x, CInt(clientRect.Y) + CInt(clientRect.Height) - icon.Height, icon.Width, icon.Height)
            graphics.DrawImage(imageRect, icon, ContentAlignment.TopLeft, True)
        End SyncLock
    End Sub
End Class

Public Class MyElementProvider
    Inherits SchedulerElementProvider
    Public Sub New(scheduler As RadScheduler)
        MyBase.New(scheduler)
    End Sub
    Protected Overrides Function CreateElement(Of T As SchedulerVisualElement)(view As SchedulerView, context As Object) As T
        If GetType(T) = GetType(AppointmentElement) Then
            Return TryCast(New MyAppointmentElement(Me.Scheduler, view, DirectCast(context, IEvent)), T)
        End If
        Return MyBase.CreateElement(Of T)(view, context)
    End Function
End Class

To reproduce:

            this.radScheduler1.ActiveViewType = Telerik.WinControls.UI.SchedulerViewType.Month;

            SchedulerMonthView monthView = this.radScheduler1.GetMonthView();
            DateTime start= new DateTime(2018, 8, 1);
            DateTime end= new DateTime(2018,8,31);
            monthView.ShowFullMonth = true;
            monthView.StartDate=start;
            monthView.RangeStartDate = start;
            monthView.RangeEndDate = end;

You will notice that you can navigate outside the specified range.

Workaround: manipulate the start date of the view:
this.radScheduler1.ActiveView.PropertyChanged += ActiveView_PropertyChanged;

        DateTime start = new DateTime(2018, 8, 1);
        DateTime end = new DateTime(2018,8,31);

        private void ActiveView_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "StartDate" && (this.radScheduler1.ActiveView.StartDate < start || start.AddDays(30) < this.radScheduler1.ActiveView.StartDate) 
                || e.PropertyName == "WeekCount" && this.radScheduler1.ActiveView.EndDate > end)
            {
                this.radScheduler1.ActiveView.StartDate = start;
            }
        }

How to reproduce:
public partial class RadForm1 : Telerik.WinControls.UI.RadForm
{
    public RadForm1()
    {
        InitializeComponent();
        
        this.radScheduler1.MouseMove += RadScheduler1_MouseMove;
        this.radScheduler1.GroupType = GroupType.Resource;

        Appointment appointment = new Appointment(DateTime.Today.AddHours(13), TimeSpan.FromHours(1), "Test Appointment");
        this.radScheduler1.Appointments.Add(appointment);
    }

    private void RadScheduler1_MouseMove(object sender, MouseEventArgs e)
    {
        Point pt = this.radScheduler1.PointToClient(Cursor.Position);
        SchedulerCellElement cell = this.radScheduler1.SchedulerElement.ElementTree.GetElementAtPoint(pt) as SchedulerCellElement;

        if (cell != null)
        {
            if (cell.Date != null)
            {
                Console.WriteLine(cell.Date.ToShortTimeString());
            }
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        switch (this.radScheduler1.ActiveViewType)
        {
            // showing the Day View
            case SchedulerViewType.Day:

                var theDayView = this.radScheduler1.GetDayView();
                if (theDayView != null)
                {
                    RulerPrimitive ruler = (this.radScheduler1.SchedulerElement.ViewElement as SchedulerDayViewElement).DataAreaElement.Ruler;
                    ruler.RangeFactor = ScaleRange.QuarterHour;
                    ruler.StartScale = 8;
                    ruler.EndScale = 18;
                }
                break;
        }
    }
}

Workaround: instead of accessing directly the ruler, apply the scaling on the view element
private void button2_Click(object sender, EventArgs e)
{
    switch (this.radScheduler1.ActiveViewType)
    {
        // showing the Day View
        case SchedulerViewType.Day:

            var theDayView = this.radScheduler1.GetDayView();
            if (theDayView != null)
            {
                theDayView.RangeFactor = ScaleRange.QuarterHour;
                theDayView.RulerStartScale = 8;
                theDayView.RulerEndScale = 18;
            }
            break;
    }
}

How to rerproduce:
this.radScheduler1.AccessibleInterval.Start = new DateTime(2018, 7, 18, 00, 00, 00).AddMonths(-2);
            this.radScheduler1.AccessibleInterval.End = new DateTime(2018, 7, 18, 00, 00, 00).AddMonths(2);
            this.radScheduler1.ActiveViewType = Telerik.WinControls.UI.SchedulerViewType.Month;

Workaround:
public class CustomRadScheduler : RadScheduler
{
    private FieldInfo schedulerFi;
    private FieldInfo activeViewsFi;
    private MethodInfo onPropertyChangedMi;
    private MethodInfo setActiveViewMi;

    protected override void CreateChildItems(RadElement parent)
    {
        base.CreateChildItems(parent);

        this.activeViewsFi = typeof(RadScheduler).GetField("activeViews", BindingFlags.Instance | BindingFlags.NonPublic);
        this.schedulerFi = typeof(SchedulerView).GetField("scheduler", BindingFlags.Instance | BindingFlags.NonPublic);
        this.onPropertyChangedMi = typeof(SchedulerView).GetMethod("OnPropertyChanged", BindingFlags.Instance | BindingFlags.NonPublic);
        this.setActiveViewMi = typeof(RadScheduler).GetMethod("SetActiveView", BindingFlags.Instance | BindingFlags.NonPublic);
    }

    public override string ThemeClassName
    {
        get
        {
            return typeof(RadScheduler).FullName;
        }
    }

    /// <summary>
    /// Gets or sets the type of the active view.
    /// </summary>
    /// <value>The type of the active view.</value>
    [DefaultValue(SchedulerViewType.Day)]
    [NotifyParentProperty(true)]
    public override SchedulerViewType ActiveViewType
    {
        get
        {
            return base.ActiveViewType;
        }
        set
        {
            if (this.ActiveViewType != value && value == SchedulerViewType.Month)
            {
                SchedulerView newView;
                Dictionary<SchedulerViewType, SchedulerView> activeViews = this.activeViewsFi.GetValue(this) as Dictionary<SchedulerViewType, SchedulerView>;
                if (activeViews.ContainsKey(value))
                {
                    newView = activeViews[value];
                }
                else
                {
                    SchedulerView view = new CustomSchedulerMonthView();
                    this.schedulerFi.SetValue(view, this);
                    this.onPropertyChangedMi.Invoke(view, new object[] { new string[] { "Scheduler" } });
                    newView = view;
                }

                if (this.ActiveView != newView && newView != null)
                {
                    this.setActiveViewMi.Invoke(this, new object[] { newView, true });
                }
            }
            else
            {
                base.ActiveViewType = value;
            }
        }
    }
}

public class CustomSchedulerMonthView : SchedulerMonthView
{
    public override SchedulerView OffsetView(int offset)
    {
        if (this.ShowFullMonth)
        {
            DateTime dtStart = DateHelper.GetStartOfMonth(this.StartDate);
            if (this.StartDate.Day > 1)
            {
                dtStart = dtStart.AddMonths(1);
            }

            dtStart = dtStart.AddMonths(offset);
            return this.CreateViewWithStartDate(dtStart);
        }
        else
        {
            DateTime startDate = this.StartDate.Add(new TimeSpan(offset * this.OffsetTimeSpan.Ticks));
            DateTimeInterval interval = new DateTimeInterval(startDate, this.GetEndDate(startDate));

            if (this.Scheduler.AccessibleInterval.Contains(interval))
            {
                return this.CreateViewWithStartDate(startDate);
            }

            if (true)
            {

            }

            return this.CreateViewWithStartDate(startDate);
        }
    }

    protected override SchedulerView CreateViewWithStartDate(DateTime startDate)
    {
        SchedulerMonthView monthView = new SchedulerMonthView();
        this.CopyPropertiesToView(monthView);
        DateTimeInterval interval = new DateTimeInterval(startDate, this.GetEndDate(startDate));
        if (interval.End > this.Scheduler.AccessibleInterval.End)
        {
            startDate = startDate.Add(new TimeSpan(-1 * this.OffsetTimeSpan.Ticks));
        }

        if (interval.Start < this.Scheduler.AccessibleInterval.Start)
        {
            startDate = startDate.Add(new TimeSpan(1 * this.OffsetTimeSpan.Ticks));
        }


        monthView.StartDate = startDate;

        if (this.ShowFullMonth)
        {
            monthView.WeekCount = DateHelper.GetMonthDisplayWeeks(startDate, this.CurrentCulture.DateTimeFormat);
        }

        return monthView;
    }
}

Use attached to reproduce.

Workaround:
protected override void OnShown(EventArgs e)
{
    base.OnShown(e);
    radScheduler1.SchedulerElement.ViewElement.UpdateCells();      
}

By design, the month view in RadScheduler stacks the appointments for a certain day considering the start time of the appointments and their duration. Internally, it uses MonthViewEventsComparer which would be great to be replaceable somehow.