TreeListNode.GetValue(Object) Method

Returns the value for a specific column, or null if no column with such columnID was found.

Namespace: DevExpress.XtraTreeList.Nodes

Assembly: DevExpress.XtraTreeList.v23.2.dll

NuGet Packages: DevExpress.Win.Navigation, DevExpress.Win.TreeList

Declaration

C#

public virtual object GetValue(
    object columnID
)

VB.NET

Public Overridable Function GetValue(
    columnID As Object
) As Object

Parameters

Name	Type	Description
columnID	Object	An object that identifies a column (a TreeListColumn object, field name, column’s absolute index or corresponding DataColumn object).

Returns

Type	Description
Object	The value of a specific column.

Remarks

The following objects and values can be passed as column identifiers:

• TreeListColumn object
• TreeListColumn.FieldName value
• TreeListColumn.AbsoluteIndex value
• System.Data.DataColumn object (when TreeList.DataSource represents the System.Data.DataView or System.Data.DataTable source)

Example

The following example iterates through root nodes of the Tree List and changes the “Budget” column value for the “Sales and Marketing” department.TreeListColumn instances are used as column identifiers in the TreeListNode.GetDisplayText, TreeListNode.GetValue and TreeListNode.SetValue methods.

C#

IEnumerator en = treeList1.Nodes.GetEnumerator();
TreeListColumn columnDep = treeList1.Columns["Department"];
TreeListColumn columnBudget = treeList1.Columns["Budget"];
while (en.MoveNext()) {
   TreeListNode childNode = (TreeListNode)en.Current;
   if(childNode.GetDisplayText(columnDep) == "Sales and Marketing") {
      decimal newBudget = (decimal)childNode.GetValue(columnBudget) / 2;
      childNode.SetValue(columnBudget, newBudget);
   }
}

VB.NET

Dim en As IEnumerator = TreeList1.Nodes.GetEnumerator()
Dim ColumnDep As TreeListColumn = TreeList1.Columns("Department")
Dim ColumnBudget As TreeListColumn = TreeList1.Columns("Budget")
While en.MoveNext() = True
   Dim ChildNode As TreeListNode = CType(en.Current, TreeListNode)
   If ChildNode.GetDisplayText(ColumnDep) = "Sales and Marketing" Then
      Dim NewBudget As Decimal = CType(ChildNode.GetValue(ColumnBudget), Decimal) / 2
      ChildNode.SetValue(ColumnBudget, NewBudget)
   End If
End While

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the GetValue(Object) 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#

winforms-treelist-save-restore-expanded-state-of-nodes/CS/TreeListViewState.cs#L35

foreach(TreeListNode node in TreeList.Selection)
    al.Add(node.GetValue(TreeList.KeyFieldName));
return al;

winforms-treelist-sync-position-of-nodes-with-data-records/CS/Q351285/Form1.cs#L51

    UpdateNodesPositions(n.Nodes);
    n.TreeList.SetNodeIndex(n, Convert.ToInt32(n.GetValue("Order")));
}

VB.NET

winforms-treelist-save-restore-expanded-state-of-nodes/VB/TreeListViewState.vb#L38

For Each node As TreeListNode In TreeList.Selection
    al.Add(node.GetValue(TreeList.KeyFieldName))
Next node

winforms-treelist-sync-position-of-nodes-with-data-records/VB/Q351285/Form1.vb#L63

    UpdateNodesPositions(n.Nodes)
    n.TreeList.SetNodeIndex(n, Convert.ToInt32(n.GetValue("Order")))
Next