TreeListNodeIterator.MoveNext() Method

Moves to the next node.

Namespace: DevExpress.Xpf.Grid

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

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public bool MoveNext()

VB.NET

Public Function MoveNext As Boolean

Returns

Type	Description
Boolean	true if the current node is not the last node; otherwise, false.

Remarks

Use the MoveNext method to iterate through the nodes. The currently processed node is returned by the TreeListNodeIterator.Current property. Each time the MoveNext method is called, the Node Iterator moves to the next node in the hierarchy and updates the TreeListNodeIterator.Current property. If the current node is the last node, the MoveNext method returns false.

To reset the Node Iterator to its initial state, call the TreeListNodeIterator.Reset method.

Example

This example shows how to traverse through all visible nodes to expand ones that have 4 or more child nodes. Nodes that have less than 4 child nodes are collapsed.

View Example: Iterate Through Nodes With the TreeListNodeIterator

MainWindow.xaml

<dxg:GridControl x:Name="grid" 
                 AutoGenerateColumns="AddNew" 
                 EnableSmartColumnsGeneration="True" 
                 Loaded="OnGridLoaded">
    <dxg:GridControl.View>
        <dxg:TreeListView x:Name="view" AutoWidth="True"
                          KeyFieldName="ID" ParentFieldName="ParentID"/>
    </dxg:GridControl.View>
</dxg:GridControl>

MainWindow.xaml.cs

void SmartExpandNodes(int minChildCount) {
    TreeListNodeIterator nodeIterator = new TreeListNodeIterator(view.Nodes, true);
    while (nodeIterator.MoveNext())
        nodeIterator.Current.IsExpanded = nodeIterator.Current.Nodes.Count >= minChildCount;
}

void OnGridLoaded(object sender, RoutedEventArgs e) {
    SmartExpandNodes(4);
}

MainWindow.xaml.vb

Private Sub SmartExpandNodes(ByVal minChildCount As Integer)
    Dim nodeIterator As TreeListNodeIterator = New TreeListNodeIterator(Me.view.Nodes, True)
    While nodeIterator.MoveNext()
        nodeIterator.Current.IsExpanded = nodeIterator.Current.Nodes.Count >= minChildCount
    End While
End Sub

Private Sub OnGridLoaded(ByVal sender As Object, ByVal e As RoutedEventArgs)
    SmartExpandNodes(4)
End Sub

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the MoveNext() method.

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#

how-to-emulate-binding-to-the-isexpanded-property-of-the-treelistnode-t127638/CS/DevExpress.Example04/BindableExpandingBehavior.cs#L26

TreeListNodeIterator iterator = new TreeListNodeIterator(nodes);
while(iterator.MoveNext()) {
    this.SubscribeObject(iterator.Current.Content);

wpf-treelist-iterate-through-nodes-with-the-treelistnodeiterator/CS/WpfApplication1/MainWindow.xaml.cs#L13

TreeListNodeIterator nodeIterator = new TreeListNodeIterator(view.Nodes, true);
while (nodeIterator.MoveNext())
    nodeIterator.Current.IsExpanded = nodeIterator.Current.Nodes.Count >= minChildCount;

VB.NET

how-to-emulate-binding-to-the-isexpanded-property-of-the-treelistnode-t127638/VB/DevExpress.Example04/BindableExpandingBehavior.vb#L31

Dim iterator As New TreeListNodeIterator(nodes)
Do While iterator.MoveNext()
    Me.SubscribeObject(iterator.Current.Content)

wpf-treelist-iterate-through-nodes-with-the-treelistnodeiterator/VB/WpfApplication1/MainWindow.xaml.vb#L16

Dim nodeIterator As TreeListNodeIterator = New TreeListNodeIterator(Me.view.Nodes, True)
While nodeIterator.MoveNext()
    nodeIterator.Current.IsExpanded = nodeIterator.Current.Nodes.Count >= minChildCount