Dashboard.ItemCollectionChanged Event

Occurs after the collection of dashboard items has been changed.

Namespace: DevExpress.DashboardCommon

Assembly: DevExpress.Dashboard.v19.1.Core.dll

Declaration

C#

public event EventHandler<NotifyingCollectionChangedEventArgs<DashboardItem>> ItemCollectionChanged

VB.NET

Public Event ItemCollectionChanged As EventHandler(Of NotifyingCollectionChangedEventArgs(Of DashboardItem))

Event Data

The ItemCollectionChanged event's data class is NotifyingCollectionChangedEventArgs<DashboardItem>. The following properties provide information specific to this event:

Property	Description
AddedItems	Gets items added to the NotifyingCollection<T>.
RemovedItems	Gets items removed from the NotifyingCollection<T>.

Remarks

The ItemCollectionChanged event is raised after dashboard items are added to or removed from the Dashboard.Items collection.

Use the event parameter’s NotifyingCollectionChangedEventArgs`1.AddedItems and NotifyingCollectionChangedEventArgs`1.RemovedItems properties to determine which dashboard items have been added or removed, respectively.

Note

The complete sample project How to notify when a dashboard item is added, removed or duplicated is available in the DevExpress Examples repository.

The following code logs the DashboardItem information when a DashboardItem is added, deleted or duplicated.

C#

private void DashboardDesigner1_DashboardLoaded(object sender, DevExpress.DashboardWin.DashboardLoadedEventArgs e)
{
    e.Dashboard.ItemCollectionChanged += Dashboard_ItemCollectionChanged;
}

private void Dashboard_ItemCollectionChanged(object sender, NotifyingCollectionChangedEventArgs<DashboardItem> e)
{
    Dashboard dBoard = sender as Dashboard;
    if (e.AddedItems.Count > 0)
    {
        if (e.AddedItems.Count == 1 && dBoard.Items.Count(i => i.Name == e.AddedItems[0].Name) > 1)
            AddToLog("Duplicated", e.AddedItems);
        else
            AddToLog("Added", e.AddedItems);
    }
    if (e.RemovedItems.Count > 0)
    {
        AddToLog("Removed", e.RemovedItems);
    }
}

VB.NET

Private Sub DashboardDesigner1_DashboardLoaded(ByVal sender As Object, ByVal e As DevExpress.DashboardWin.DashboardLoadedEventArgs)
    AddHandler e.Dashboard.ItemCollectionChanged, AddressOf Dashboard_ItemCollectionChanged
End Sub

Private Sub Dashboard_ItemCollectionChanged(ByVal sender As Object, ByVal e As NotifyingCollectionChangedEventArgs(Of DashboardItem))
    Dim dBoard As Dashboard = TryCast(sender, Dashboard)
    If e.AddedItems.Count > 0 Then
        If e.AddedItems.Count = 1 AndAlso dBoard.Items.Count(Function(i) i.Name = e.AddedItems(0).Name) > 1 Then
            AddToLog("Duplicated", e.AddedItems)
        Else
            AddToLog("Added", e.AddedItems)
        End If
    End If
    If e.RemovedItems.Count > 0 Then
        AddToLog("Removed", e.RemovedItems)
    End If
End Sub

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the ItemCollectionChanged event.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

winforms-dashboard-item-collection-changed-event/CS/Dashboard_ItemCollectionChanged_Example/Form1.cs#L25

{
    e.Dashboard.ItemCollectionChanged += Dashboard_ItemCollectionChanged;
}

VB.NET

winforms-dashboard-item-collection-changed-event/VB/Dashboard_ItemCollectionChanged_Example/Form1.vb#L23

Private Sub DashboardDesigner1_DashboardLoaded(ByVal sender As Object, ByVal e As DevExpress.DashboardWin.DashboardLoadedEventArgs)
    AddHandler e.Dashboard.ItemCollectionChanged, AddressOf Dashboard_ItemCollectionChanged
End Sub