Accessing Columns

• Aug 01, 2019

The ASPxTreeList control stores its columns within the ASPxTreeList.Columns collection. To access only visible columns, use the ASPxTreeList.VisibleColumns property. Individual columns are represented by the TreeListDataColumn objects. A data column can be accessed by specifying its ID, caption or the name of the data source field to which it is bound.

C#

using DevExpress.Web.ASPxTreeList;

// Accessing a column by specifying the name of the data source field to which it is bound.
TreeListDataColumn colDepartment = treeList.Columns["Department"] as TreeListDataColumn;
// Accessing a column by specifying its caption.
TreeListDataColumn colPhone = treeList.Columns["Primary Phone"] as TreeListDataColumn;
// Accessing a column by its index within the Columns collection.
TreeListDataColumn colFirstColumn = treeList.Columns[0] as TreeListDataColumn;

VB.NET

Imports DevExpress.Web.ASPxTreeList

' Accessing a column by specifying the name of the data source field to which it is bound.
Dim colDepartment As TreeListDataColumn = treeList.Columns("Department")
' Accessing a column by specifying its caption.
Dim colPhone As TreeListDataColumn = treeList.Columns("Primary Phone")
' Accessing a column by its index within the Columns collection.
Dim colFirstColumn As TreeListDataColumn = treeList.Columns(0)

On the client, data columns can be accessed via the methods listed below:

• ASPxClientTreeList.GetColumnByFieldName
• ASPxClientTreeList.GetColumnByIndex
• ASPxClientTreeList.GetColumnByName

The number of columns can be obtained via the ASPxClientTreeList.GetColumnCount method.