Distinct filtering boolean with friendly names.

[Clint Singer]

Hi,

I have a column which is a boolean type.  When one clicks on the filter icon it gives the options, True and False, as is expected.   I replaced the True and False with some friendly names.  When I filter by these friendly names, the software crashes stating it doesn't know how to convert them to boolean types (as would be expected). 

I can trap the filtering event but I am not sure what I need to do next.  Do I need to modify the GridViewFilteringEventArgs?  An example would be appreciated.

Cheers,
Clint

[Rossen Hristov]

Hi Clint Singer,

You can use an IValueConverter in the Binding of your boolean column. The filtering UI will display the friendly names returned by the IValueConverter. Now, to retain the check-box appearance of the column I have defined its CellTemplate.

<UserControl x:Class="TicketID_256314_FriendlyDistinctValues.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
    xmlns:local="clr-namespace:TicketID_256314_FriendlyDistinctValues"
    xmlns:Controls="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
  <Grid>
    <Grid.Resources>
      <local:NationalToFriendlyNameConverter x:Key="NationalToFriendlyNameConverter"/>
    </Grid.Resources>
    <telerik:RadGridView Name="playersGrid"
                         AutoGenerateColumns="False"
                         ColumnsWidthMode="Auto">
      <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn Header="Name"
                                    DataMemberBinding="{Binding Name}">
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn Header="Number"
                                    DataMemberBinding="{Binding Number}">
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn Header="Position"
                                    DataMemberBinding="{Binding Position}">
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn Header="Country"
                                    DataMemberBinding="{Binding Country}">
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn Header="National"
                                    DataMemberBinding="{Binding National, Converter={StaticResource NationalToFriendlyNameConverter}}">
          <telerik:GridViewDataColumn.CellTemplate>
            <DataTemplate>
              <CheckBox IsChecked="{Binding National, Mode=TwoWay}" Controls:StyleManager.Theme="Office_Black"/>
            </DataTemplate>
          </telerik:GridViewDataColumn.CellTemplate>
        </telerik:GridViewDataColumn>
      </telerik:RadGridView.Columns>
    </telerik:RadGridView>
  </Grid>
</UserControl>

using System;
using System.Globalization;
using System.Windows.Data;

namespace TicketID_256314_FriendlyDistinctValues
{
    public class NationalToFriendlyNameConverter : IValueConverter
    {
        #region IValueConverter Members

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return ((bool) value) ? "National Player" : "Non-National Player";
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}

I have attached the sample project. Please, let me know if this is not what you are after or if you have any other questions.

All the best,
Ross
the Telerik team

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[Joe Brown]

This worked perfectly for once I changed the ((bool) value) to System.Convert.ToBoolean(value).  
It seems it could not unbox the value into a boolean with the cast that was originally coded.

Thanks for the help from this post !!