[Solved] FilteringDropDown Operator default choice

[shirley wang]

Dear People,

What i want to achieve is when i open the filteringDropDown, the default choice of filterOperator is "contains" not "is equal to".
Can anyone tell me how ?

Best wishes

Shirley Wang

[Rossen Hristov]

Hi shirley wang,

You can derive from the default filtering control and change this behavior. Then assign the custom filtering control as the filtering control of the column in question. Something like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Telerik.Windows.Data;
using Telerik.Windows.Controls;
using Telerik.Windows.Controls.GridView;

namespace DefaultFilterOperator
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            var nameColumn = (GridViewBoundColumnBase)this.clubsGrid.Columns[0];
            var customFilteringControl = new MyFilteringControl();
            nameColumn.FilteringControl = customFilteringControl;
        }
    }

    /// <summary>
    /// MyFilteringControl
    /// </summary>
    public class MyFilteringControl : FilteringControl
    {
        public override void Prepare(GridViewBoundColumnBase column)
        {
            base.Prepare(column);

            FilteringViewModel vm = this.DataContext as FilteringViewModel;

            if (vm != null)
            {
                if (!vm.Filter1.IsActive)
                {
                    vm.Filter1.Operator = FilterOperator.Contains;
                }

                if (!vm.Filter2.IsActive)
                {
                    vm.Filter2.Operator = FilterOperator.Contains;
                }
            }
        }
    }
}

And the XAML:

<Window x:Class="DefaultFilterOperator.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        xmlns:my="clr-namespace:DefaultFilterOperator"
        Title="MainWindow" Height="700" Width="700">
    <Window.Resources>
        <my:MyViewModel x:Key="MyViewModel"/>
    </Window.Resources>
    <Grid DataContext="{StaticResource MyViewModel}">
        <telerik:RadGridView Grid.Row="0"
                             Name="clubsGrid"
                             ItemsSource="{Binding Clubs}"
                             AutoGenerateColumns="False"
                             Margin="5">
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding Name}"/>
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>
    </Grid>
</Window>

I hope this helps.

All the best,
Ross
the Telerik team

[shirley wang]

Hello Ross,

That is a great solution. Thank you very much.
Only one question: how can i change the theme to office_blue?

[shirley wang]

I know it now.

StyleManager.SetTheme(customFilteringControl, new Office_BlueTheme());

Thank you