下面的示例访问了树状列表的根结点，并修改了“Sales and Marketing”部门的“Budget”列值。

TreeListColumn 的实例被用作列标识符 (在 TreeListNode.GetDisplayText、TreeListNode.GetValue 和 TreeListNode.SetValue 方法中)。

C#CopyCode image复制代码
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);
   }
}
Visual BasicCopyCode image复制代码
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