Problem with ComboBoxColumn and ValueConverter

4040

Coso posted over 11 years ago

Hello,

I need to show in a comboboxcolumn two properties of a complex object.

To achieve that I used the ValueConverter but it doesn't show me anything.

I attached a sample to show you how I do it.

Regards.

XamGrid.zip

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12004

[Infragistics] Duane Hoyt posted over 11 years ago

Hello Coso,

In the ComboBoxColumn set the SelectedValuePath and DisplayMemberPath properties.

Let me know if I can provide any further assistance.
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4040

Coso posted over 11 years ago in reply to [Infragistics] Duane Hoyt

Hello Duane,

I set the displamemberpath and selectedValuePath to property "Rue" but it doesn't work either.

Regards.

XamGrid.zip
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14517

Offline Valerie S posted over 11 years ago in reply to Coso

Hello Coso,

One option is to wrap the int value in another object which exposes the int value and use a toString() method to display the text in the Filter Selection Control and implements IComparable for filtering.

Another option is to change the ItemTemplate used by the List Box (named itemsBox) in the FilterSelectionControl to use a converter to display the text instead of the int value as is done for the Label. When doing this, the one issue is that the List Box defined in the Style for the FilterSelectionControl is used by all columns, therefore the DataTemplate used for the ItemTemplate would need to change based on the Column. I have attached a sample illustrating this where I use the Loaded Event of the Listbox to set the appropriate DataTemplate.

Details on the implementation are as follows:

I have defined two data templates to use for the ItemTemplate of the List Box, one using the converter one with the original implementation:


<DataTemplate x:Key="NormalFilter">
     <CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay
             Content="{Binding ContentString}" IsThreeState="False" />
</DataTemplate>
<DataTemplate x:Key="CoteFilter">
        <CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay  Content="{Binding ContentString, 
 Converter={StaticResource ConvertisseurPerso2}}" IsThreeState="False" />
</DataTemplate>

The ListBox (itemsBox) in the FilterSelectionControl is changed to handle the Loaded event where the ItemTemplate will be set based on the column name. I have also binded the Tag property to the Column Name to easily implement the selection of the template in the Loaded event:


  <Style TargetType="igPrim:FilterSelectionControl">
      <Setter Property="Foreground" Value="#FF000000"/>
…
 <ListBox x:Name="itemsBox" 
      ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=UniqueValues}" 
      Padding="0" Loaded="itemsBox_Loaded" Tag="{Binding RelativeSource={RelativeSource TemplatedParent}, 
      Path=Cell.Column.DisplayNameResolved}" Background="Transparent" >
</ListBox>
 ...

The loaded event gets the correct DataTemplate from the grid’s resources and sets the Item Template:


private void itemsBox_Loaded(object sender, RoutedEventArgs e)
{
   ListBox lb = (ListBox)sender; 
   string name = lb.Tag as string; 
   if (name == "Côté")
       lb.ItemTemplate = (DataTemplate)this.xamGrid1.Resources["CoteFilter"];
  else
       lb.ItemTemplate = (DataTemplate)this.xamGrid1.Resources["NormalFilter"];
}