public override object GetValue(object component)
{
var outerRowItem = component as RowItem;
if (null == outerRowItem)
{
return(null);
}
var reportRow = outerRowItem.Value as GroupedRow;
if (null == reportRow)
{
return(null);
}
IEnumerable <RowItem> innerRows;
if (null == OuterPivotKey)
{
innerRows = reportRow.InnerRows;
}
else
{
RowItem innerRow;
if (!reportRow.TryGetInnerRow(OuterPivotKey, out innerRow))
{
return(null);
}
innerRows = new[] { innerRow };
}
var values = new List <object>();
foreach (var innerRow in innerRows)
{
var value = DisplayColumn.GetValue(innerRow, InnerPivotKey);
if (null != value)
{
values.Add(value);
}
}
var distinctValues = values.Distinct().ToArray();
if (distinctValues.Length == 0)
{
return(null);
}
else if (distinctValues.Length == 1)
{
return(distinctValues[0]);
}
else
{
return(null);
}
}
