TreeListView.AddingNewNode Event

Occurs before a new node is added to the GridControl and allows you to initialize the new record.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v23.2.dll

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public event TreeListAddingNewEventHandler AddingNewNode

VB.NET

Public Event AddingNewNode As TreeListAddingNewEventHandler

Event Data

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

Property	Description
NewObject	Gets or sets the object to be added to the binding list. Inherited from AddingNewEventArgs.
ParentNode	A parent node.

Remarks

The AddingNewNode event occurs before the GridControl adds a new record to your data source. In this event handler, you can specify a data object and initialize its values.

XAML

<dxg:GridControl>
    <dxg:GridControl.View>
        <dxg:TableView x:Name="view"
                       KeyFieldName="ID" 
                       ParentFieldName="ParentID"
                       NewItemRowPosition="Top"
                       AddingNewNode="view_AddingNewNode"/>
    </dxg:GridControl.View>
</dxg:GridControl>

C#

void view_AddingNewNode(object sender, DevExpress.Xpf.Grid.TreeList.TreeListAddingNewEventArgs e) {
    e.NewObject = new Employee() {
        ID = view.TotalNodesCount + 1,
        Name = "",
        Department = "Finance",
        Position = "Manager"
    };
}

VB.NET

Private Sub view_AddingNewNode(ByVal sender As Object, ByVal e As DevExpress.Xpf.Grid.TreeList.TreeListAddingNewEventArgs)
    e.NewObject = New Employee() With {
        .ID = view.TotalNodesCount + 1,
        .Name = "",
        .Department = "Finance",
        .Position = "Manager"
    }
End Sub

Note

The AddingNewNode event does not fire when you add a new node directly to a bound data source.

If you want to maintain a clean MVVM pattern and specify a new data record in a View Model, create a command and bind it to the AddingNewNodeCommand property.

Refer to the following help topic for more information: Add and Remove Rows.