[Solved] FirstFunction Display Property

[Daniel Knoll]

Hi,

I'm using the RadGridView with AggregateFunctions. I have aggregated Sums of specific columns. Now I want to have the Text of one column to appear next to the aggregates. For this purpose I use the FirstFunction on the column I want to appear.

The problem is, I get the whole row bound to the column and it seems like the ToString() method of the DataContext of the row is called. But I want a specific property of the row bound to my column. Usually you want to bind the same property as the Column where the function is defined. I use a GridViewComboBoxColumn for this column.

Here is my code:

<telerik:GridViewDataColumn Header="Preis" DataFormatString="N2" DataMemberBinding="{Binding Path=Price}" TextAlignment="Right" MinWidth="100">
    <telerik:GridViewDataColumn.AggregateFunctions>
        <telerik:SumFunction ResultFormatString="{}{0:N2}" />
    </telerik:GridViewDataColumn.AggregateFunctions>
</telerik:GridViewDataColumn>
<telerik:GridViewComboBoxColumn ItemsSource="{Binding Path=DataContext.Currencies, ElementName=root}" MinWidth="100" Header="Währung" DataMemberBinding="{Binding Path=Currency}">
    <telerik:GridViewComboBoxColumn.AggregateFunctions>
        <telerik:FirstFunction />
    </telerik:GridViewComboBoxColumn.AggregateFunctions>
</telerik:GridViewComboBoxColumn>

I need a DisplayProperty in the FirstFunction, so I can bind to "Currency" of the row.

Greets

[Rossen Hristov]

Hello,

What you can do is create a custom aggregate function. This gives you the freedom to return anything.

All the best,
Ross
the Telerik team