Winforms Data Grid - Calculate a summary against detail rows and display it in a master row cell

This example creates an unbound column in the master GridView and handles the CustomUnboundColumnData event to calculate the number of detail rows and display the number in the master row.

public Form1() {
    // ...
    gridControl1.ForceInitialize();
    GridColumn col = gridView1.Columns.AddField("Tasks");
    col.UnboundType = DevExpress.Data.UnboundColumnType.Integer;
    col.Visible = true;
    gridView1.CustomUnboundColumnData+=new DevExpress.XtraGrid.Views.Base.CustomColumnDataEventHandler(gridView1_CustomUnboundColumnData);
}
private void gridView1_CustomUnboundColumnData(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDataEventArgs e) {
    GridView view = sender as GridView;
    if (e.Column.FieldName != "Tasks") return;
    if (!e.IsGetData) return;
    DataRow row = ((view.DataSource as IList)[e.ListSourceRowIndex] as DataRowView).Row;
    e.Value = row.GetChildRows("Project_Tasks").Length;
}

Files to Review

• Form1.cs (VB: Form1.vb)

Documentation

• Unbound Columns

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