GanttView.TasksScheduled Event

Occurs after Gantt tasks have been rescheduled and allows you to rollback the latest edit changes.

Namespace: DevExpress.Xpf.Gantt

Assembly: DevExpress.Xpf.Gantt.v21.2.dll

NuGet Package: DevExpress.Wpf.Gantt

Declaration

C#

public event EventHandler<TasksScheduledEventArgs> TasksScheduled

VB.NET

Public Event TasksScheduled As EventHandler(Of TasksScheduledEventArgs)

Event Data

The TasksScheduled event's data class is TasksScheduledEventArgs. The following properties provide information specific to this event:

Property	Description
Handled	Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
InvalidPredecessorLinks	Gets a collection of predecessor links that are invalid after scheduling.
OriginalSource	Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
RollbackChanges	Gets or sets whether the control must rollback changes that caused the scheduling.
RoutedEvent	Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

The event data class exposes the following methods:

Method	Description
InvokeEventHandler(Delegate, Object)	When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs.
OnSetSource(Object)	When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs.

Remarks

The TasksScheduled event allows you to rollback changes if they create invalid links.

Use the TasksScheduledEventArgs.InvalidPredecessorLinks property to access a collection of invalid links. Set the TasksScheduledEventArgs.RollbackChanges property to true to rollback the latest changes.

Xaml

<dxgn:GanttControl ...>
    <dxgn:GanttControl.View>
        <dxgn:GanttView ... 
            TasksScheduled="GanttView_TasksScheduled">
        </dxgn:GanttView>
    </dxgn:GanttControl.View>
</dxgn:GanttControl>

C#

private void GanttView_TasksScheduled(object sender, DevExpress.Xpf.Gantt.TasksScheduledEventArgs e) {
    if (e.InvalidPredecessorLinks.Count > 0) e.RollbackChanges = true;
}

VB.NET

Private Sub GanttView_TasksScheduled(ByVal sender As Object, ByVal e As DevExpress.Xpf.Gantt.TasksScheduledEventArgs)
    If e.InvalidPredecessorLinks.Count > 0 Then e.RollbackChanges = True
End Sub