TreeListView.CheckAllNodes() Method

Checks all nodes.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v20.2.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.Grid.Core, DevExpress.Wpf.Grid.Core

Declaration

C#

public void CheckAllNodes()

VB.NET

Public Sub CheckAllNodes

Remarks

You can embed check boxes into nodes to allow an end user to check/uncheck individual nodes.

Embed Check Boxes into Nodes

1. Set the TreeListView.ShowCheckboxes property to true to display check boxes embedded into nodes.

2. Set values of check boxes. Do one of the following:

   • Specify the TreeListView.CheckBoxFieldName property to bind check boxes to a boolean field in the grid’s data source.
   • Check nodes in code.

The code sample below shows how to display check boxes and bind them to the OnVacation field:

Xaml

<dxg:GridControl Name="gridControl">
    <dxg:GridControl.Columns>
        <dxg:GridColumn FieldName="Name"/>
        <dxg:GridColumn FieldName="Department"/>
        <dxg:GridColumn FieldName="Position"/>
    </dxg:GridControl.Columns>
    <dxg:GridControl.View>
        <dxg:TreeListView KeyFieldName="ID" ParentFieldName="ParentID" AutoExpandAllNodes="True"
            CheckBoxFieldName="OnVacation" ShowCheckboxes="True" />
    </dxg:GridControl.View>
</dxg:GridControl>

C#

public class Employee {
    public int ID { get; set; }
    public int ParentID { get; set; }
    public string Name { get; set; }
    public string Position { get; set; }
    public string Department { get; set; }
    public bool OnVacation { get; set; }
}

VB.NET

Public Class Employee
    Public Property ID As Integer
    Public Property ParentID As Integer
    Public Property Name As String
    Public Property Position As String
    Public Property Department As String
    Public Property OnVacation As Boolean
End Class 

Check Nodes in Code

Use the following methods to check/uncheck nodes in code:

Method	Description
TreeListView.CheckAllNodes	Checks all nodes.
TreeListView.UncheckAllNodes	Unchecks all nodes.
TreeListNode.IsChecked	Checks/unchecks the node.

When a node’s check state is changed, the TreeList View raises the TreeListView.NodeCheckStateChanged event. Use the TreeListNode.IsChecked property to identify whether a node is checked.