GridView Filtering - Distinct values not displayed

[Robert]

Dear Support,

I try to use filtering but in distinct value area the values are not appear.
Any idea why?

Here is my xaml code:

<telerikGridView:RadGridView Grid.Row="1" Margin="5" x:Name="SearchGrid" AutoGenerateColumns="False"
             ItemsSource="{Binding Path=ValuesOfQuestions, Mode=OneWay}"
             DistinctValuesLoading="SearchGrid_DistinctValuesLoading"
             IsReadOnly="True" IsFilteringAllowed="True" ShowGroupPanel="False"
             ShowColumnFooters="False" ShowColumnSortIndexes="True">
 <telerikGridView:RadGridView.Columns>
    <telerikGridView:GridViewDataColumn x:Name="ID" Header="ID" ShowDistinctFilters="True" DataMemberBinding="{Binding Path=ID}" />
    <telerikGridView:GridViewDataColumn x:Name="Date" Header="Date" DataMemberBinding="{Binding Path=Date}" />
     <telerikGridView:GridViewDataColumn x:Name="Value" Header="Value" DataMemberBinding="{Binding Path=Value}" />
 </telerikGridView:RadGridView.Columns>
 </telerikGridView:RadGridView>

XAML code behind:

private void SearchGrid_DistinctValuesLoading(object sender, GridViewDistinctValuesLoadingEventArgs e)
        {
            e.ItemsSource = ((Telerik.Windows.Controls.RadGridView)sender).GetDistinctValues(e.Column, false);
        }

C# code:

public class ValuesOfQuestion
    {
        public int ID { get; set; }
        public string Value { get; set; }
        public DateTime Date { get; set; }
    }

    ValuesOfQuestions = new ObservableCollection<ValuesOfQuestion>();
for (int i = 0; i < 10; i++)
    {
     ValuesOfQuestions.Add(new ValuesOfQuestion { ID = i, Date = DateTime.Now, Value = "Value " + i.ToString() });
    }

And I attached a picture for my problem.

Thanks,

Robert.

[Yoan]

Hi Robert,

I have tried to reproduce the problem you report but I was not able to. I have attached a sample project which was created based on your code snippets. Please review it and let me know if I am missing something.

Regards,
Yoan
Telerik

[Robert]

Hello Yoan,

Thank you for your response.
I have tried in a new wpf project, and it is working, but I dont understand why not working in our "big" project.

Regards,
Robert

[Yoan]

Hello Robert,

Unfortunately, I can not guess what is the cause of the problem. I would suggest you to isolate the problem in the sample project which I can debug on my side. You can check this blog post which demonstrates how to isolate a problem in a sample project.

Regards,
Yoan
Telerik