FilterDescriptor Collection & Model-View-ViewModel

[Nick Anderson]

I'm using an MVVM approach to an application.  My Window has a textbox, a button, and a grid.  When i click the button, i would like it to filter the grid based on the text inputted in the textbox.  I realize the grid has built in filtering, but its more than likely too complicated for our end users.

    <Grid>
        <Grid.DataContext>
            <Binding Source="{StaticResource MyDataContext}" Mode="OneWay"  />
        </Grid.DataContext>
            <telerik:RadGridView  Margin="12,55,12,58" AutoGenerateColumns="True"    Name="RadGridView1" >

            <telerik:RadGridView.ItemsSource>
                <Binding Path="Records" Mode="TwoWay" />
            </telerik:RadGridView.ItemsSource>
        </telerik:RadGridView>
        <TextBox Height="23" HorizontalAlignment="Left" Margin="16,14,0,0" Text="{Binding SearchText}" Name="TextBox1" VerticalAlignment="Top" Width="120" />
        <Button Height="23" HorizontalAlignment="Right" Margin="0,14,61,0" Command="{Binding SearchCommand}" Name="Button1" VerticalAlignment="Top" Width="75">Button</Button>
    </Grid>

Is there any way to expose the FilterDescriptors Collection via  a binding property so i can add to it and apply the filter, since i don't have access to RadGridView1.FilterDescriptors in my code? This would be similar to how the textbox exposes it's text property.

Is there a way to expose the ColumnCollection or SortDescriptors?

[Stefan Dobrev]

Hello Nick,

Currently we are not going to change the *ors and columns properties to be dependency properties. My suggestion is to have a FilterDescriptor property in your view model and then create a small controller class that will do the magic binding between the view (RadGridView) and the view model. You can also create a ColumnInfo class and use it in your ViewModel as a collection of column definitions. Then it will be the controller's responsibility to create the correct GridViewDataColumns based on the column infos.

Sincerely yours,
Stefan Dobrev
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

[Jebouy]

Hi,

 I am using MVVM pattern. I want to reset the Grids Filter on a button Click.

[Rossen Hristov]

Hello jeb tom,

The only way to do this would be to attach to the button's click event and clear the GridViewDataControl.FilterDescriptors collection.

        private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            this.playersGrid.FilterDescriptors.Clear();
        }

I hope this helps.

Sincerely yours,
Ross
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

[Saykor]

Or you can do:

<Button Command="{Binding ClearCommand}" CommandParameter="{Binding ElementName=RadGridView1}" />

ClearCommand= new RelayCommand<RadGridView>(ExecuteClearCommand);

private void ExecuteClearCommand(RadGridView grid)
        {
            grid.FilterDescriptors.Clear();
        }