TreeList.Columns Property

Provides access to a Tree List’s column collection.

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v18.2.dll

Declaration

C#

[Browsable(false)]
[XtraSerializableProperty(true, true, true)]
public TreeListColumnCollection Columns { get; }

VB.NET

<Browsable(False)>
<XtraSerializableProperty(True, True, True)>
Public ReadOnly Property Columns As TreeListColumnCollection

Property Value

Type	Description
TreeListColumnCollection	A TreeListColumnCollection object representing a collection of all the columns within a Tree List.

Remarks

This property stores all the columns present in the Tree List control. It allows you to add and delete columns using the appropriate methods. Individual columns can be accessed using indexed notation or the bound field name as parameters.

For more information on columns, see the Columns topic.

Related GitHub Examples

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

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-implement-excel-style-tree-filtering-in-a-filter-popup-t143068/CS/RangeDate/MyGridControl/MyDateFilterPopup.cs#L252

{
    DateTime firstDay = new DateTime((int)node.GetValue(treelist.Columns[0]), 01, 01);
    DateTime endDay = new DateTime((int)node.GetValue(treelist.Columns[0]), 12, 31);

how-to-create-an-analog-of-gridlookupedit-with-treelist-in-a-popup-window-e4319/CS/TreeListLookUpEdit.cs#L134

Properties.SetCriteriaOperator(null);
if (Properties.EnableFilter && Properties.TreeList.Columns[Properties.DisplayMember] != null &&
                               Properties.TreeList.Columns[Properties.ValueMember] != null &&

how-to-add-a-horizontal-cells-merge-capability-to-an-xtratreelist-control-e2501/CS/TreeListCellMerging/MyTreeList.cs#L51

if(e.OldColumn.VisibleIndex < e.Column.VisibleIndex && this.Columns[e.Column.VisibleIndex + 1] != null)
    JumpIfInMergedCell(e, 1);

how-to-print-a-treelist-that-supports-the-horizontal-cell-merging-capability-e4344/CS/TreeListCellMerging/MyTreeList.cs#L52

if(e.OldColumn.VisibleIndex < e.Column.VisibleIndex && this.Columns[e.Column.VisibleIndex + 1] != null)
    JumpIfInMergedCell(e, 1);

how-to-display-custom-text-next-to-a-check-box-within-the-same-cell-e888/CS/WindowsApplication6/Form1.cs#L33

{
    if (e.Column != treeList1.Columns["IMAGEINDEX"])
        return;

VB.NET

how-to-implement-excel-style-tree-filtering-in-a-filter-popup-t143068/VB/RangeDate/MyGridControl/MyDateFilterPopup.vb#L210

If node.Level = 0 Then
    Dim firstDay As New Date(CInt(Math.Truncate(node.GetValue(treelist.Columns(0)))), 01, 01)
    Dim endDay As New Date(CInt(Math.Truncate(node.GetValue(treelist.Columns(0)))), 12, 31)

how-to-create-an-analog-of-gridlookupedit-with-treelist-in-a-popup-window-e4319/VB/TreeListLookUpEdit.vb#L136

Properties.SetCriteriaOperator(Nothing)
If Properties.EnableFilter AndAlso Properties.TreeList.Columns(Properties.DisplayMember) IsNot Nothing AndAlso Properties.TreeList.Columns(Properties.ValueMember) IsNot Nothing AndAlso filterText <> "" Then
    Properties.ExpandNodesForFiltering(filterText)

how-to-add-a-horizontal-cells-merge-capability-to-an-xtratreelist-control-e2501/VB/TreeListCellMerging/MyTreeList.vb#L47

If e.OldColumn.VisibleIndex < e.Column.VisibleIndex AndAlso Me.Columns(e.Column.VisibleIndex + 1) IsNot Nothing Then
    JumpIfInMergedCell(e, 1)

how-to-print-a-treelist-that-supports-the-horizontal-cell-merging-capability-e4344/VB/TreeListCellMerging/MyTreeList.vb#L48

If e.OldColumn.VisibleIndex < e.Column.VisibleIndex AndAlso Me.Columns(e.Column.VisibleIndex + 1) IsNot Nothing Then
    JumpIfInMergedCell(e, 1)

how-to-display-custom-text-next-to-a-check-box-within-the-same-cell-e888/VB/WindowsApplication6/Form1.vb#L29

Private Sub treeList1_CustomDrawNodeCell(ByVal sender As Object, ByVal e As DevExpress.XtraTreeList.CustomDrawNodeCellEventArgs) Handles treeList1.CustomDrawNodeCell
    If Not e.Column Is treeList1.Columns("IMAGEINDEX") Then
        Return