WinForms TreeList - Create an unbound column

This example creates an unbound column and handles the CustomUnboundColumnData event to supply unbound data:

// Creates and customizes an unbound column.
TreeListColumn unbColumnMarchChange = new TreeListColumn();
unbColumnMarchChange.UnboundType = DevExpress.XtraTreeList.Data.UnboundColumnType.Decimal;
unbColumnMarchChange.Visible = true;
unbColumnMarchChange.OptionsColumn.AllowEdit = false;
unbColumnMarchChange.FieldName = "ChangeFromPrevYear";
unbColumnMarchChange.Caption = "Change from Previous Year";
unbColumnMarchChange.Format.FormatType = DevExpress.Utils.FormatType.Numeric;
unbColumnMarchChange.Format.FormatString = "p2";
tlBandThisYear.Columns.Add(unbColumnMarchChange);
treeList1.CustomUnboundColumnData += TreeList1_CustomUnboundColumnData;
// ...

private void TreeList1_CustomUnboundColumnData(object sender, DevExpress.XtraTreeList.TreeListCustomColumnDataEventArgs e) {
    if(e.IsGetData && e.Column.FieldName == "ChangeFromPrevYear") {
        SalesData currentRow = e.Row as SalesData;
        if (currentRow == null) return;
        e.Value = (currentRow.MarchSales - currentRow.MarchSalesPrev) / currentRow.MarchSalesPrev;
    }
}

Files to Review

• Form1.cs (VB: Form1.vb)

Documentation

• Unbound Columns - WinForms TreeList

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