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Column Not Triggering Custom Sorting Event

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GridView
This is a migrated thread and some comments may be shown as answers.
Scott
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Scott asked on 18 Nov 2013, 10:28 PM
I have a RadGridView that is bound to an observable collection of one of my classes.  I have 2 columns bound to a bool DataMember and a converter that displays one image if true and another if false.  For whatever reason, the default sorting doesn't work, so I tried to implement the custom sorting event handler.  Upon clicking the column header, the sorting event doesn't get fired.  I have IsSortable and IsCustomSortingEnabled properties set to True.

Here is an example of the XAML:
<telerik:GridViewImageColumn
    Header="PWL"
    DataMemberBinding="{Binding IsOnPotentialWatchList, Converter={StaticResource BoolToCheckOrCrossImageConverter}}"
    IsCustomSortingEnabled="True"
    IsSortable="True"
    HeaderCellStyle="{StaticResource rgvHeaderCellStyle}"
    FooterCellStyle="{StaticResource rgvFooterCellStyleCenter}"
    CellStyle="{StaticResource rgvCellStyle}"
    HeaderTextAlignment="Left"
    TextAlignment="Left"
    Width="Auto" />

Here is my sorting event:
protected void OnCreditPolicyGridViewSorting(object sender, Telerik.Windows.Controls.GridViewSortingEventArgs e)
{
    var cpData = e.DataControl.ItemsSource as IEnumerable<CreditPolicyData>;
    if (cpData == null)
    {
        e.Cancel = true;
        return;
    }
 
    var column = e.Column as Telerik.Windows.Controls.GridViewDataColumn;
    var columnIsPWL = column.GetDataMemberName() == "IsOnPotentialWatchList";
    var columnIsWL = column.GetDataMemberName() == "IsOnWatchList";
    if (columnIsPWL || columnIsWL)
    {
        if (e.OldSortingState == Telerik.Windows.Controls.SortingState.None)
        {
            e.NewSortingState = Telerik.Windows.Controls.SortingState.Ascending;
                     
            if (columnIsPWL)
                cpData = cpData.OrderBy(cp => cp.IsOnPotentialWatchList);
 
            else if (columnIsWL)
                cpData = cpData.OrderBy(cp => cp.IsOnWatchList);
        }
        else if (e.OldSortingState == Telerik.Windows.Controls.SortingState.Ascending)
        {
            e.NewSortingState = Telerik.Windows.Controls.SortingState.Descending;
 
            if (columnIsPWL)
                cpData = cpData.OrderByDescending(cp => cp.IsOnPotentialWatchList);
 
            else if (columnIsWL)
                cpData = cpData.OrderByDescending(cp => cp.IsOnWatchList);
        }
        else
        {
            e.NewSortingState = Telerik.Windows.Controls.SortingState.None;
            cpData = cpData.OrderBy(cp => cp.SalesmanNumber).ThenBy(cp => cp.CapisNumber);
        }
 
        e.DataControl.ItemsSource = cpData.ToObservableCollection();
                 
        e.Cancel = true;
    }
}

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Dimitrina
Telerik team
answered on 21 Nov 2013, 04:22 PM
Hello,

Generally the Converter is used for UI purpose only, it should not affect the sorting. If you have a DataMemberBinding set to a boolean property, then your values should be sorted based on that boolean value.

Would it be possible for you to isolate the issue in a demo project and send it to us?

Regards,
Didie
Telerik
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Scott
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answered on 22 Nov 2013, 03:15 PM
Thanks for the response.  Before I repro the issue, could it be due to the fact that the columns not sorting are GridViewImageColumns?
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Accepted
Dimitrina
Telerik team
answered on 22 Nov 2013, 03:22 PM
Hello,

Thank you for this note. Actually the GridViewImageColumn does not behave as the GridViewDataColumn as it comes to sorting.
You will need to additionally set  SortMemberPath.
<telerik:GridViewImageColumn DataMemberBinding="{Binding IsOnPotentialWatchList}" SortMemberPath="IsOnPotentialWatchList"/>

That way the column will be sorted based on the values of the property you have set.

Let me know how this works for you?

Regards,
Didie
Telerik
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Scott
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answered on 22 Nov 2013, 03:27 PM
That was it!! Dang image columns!!
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