Filtering

RadListView provides you with the functionality to programmatically filter its data. This can be achieved through adding FilterDescriptors to its RadListView.FilterDescriptors collection. Here are the available filter descriptors:

  • TextFilterDescriptor :

    • PropertyName : Gets or sets the property used to retrieve the value to filter by.
    • Operator : Gets or sets the TextOperator value which defines how the Value member is compared with each value from the ItemsSource.
    • Value : Gets or sets the string value used in the comparisonsl This is the right operand of the comparison.
    • IsCaseSensitive: Gets or sets the value that determines whether the text comparisons will be case-sensitive. Default value is true.
  • BooleanFilterDescriptor :

    • PropertyName : Gets or sets the property used to retrieve the value to filter by.
    • Value : Gets or sets the bool value used in the comparisons. This is the right operand of the comparison.
  • NumericalFilterDescriptor :

    • PropertyName : Gets or sets the property used to retrieve the value to filter by.
    • Value : Gets or sets the numerical value used in the comparisons. This is the right operand of the comparison.
    • Operator : Gets or sets the NumericalOperator value which defines the logic behind the left and right operand comparison.
  • DateTimeFilterDescriptor :

    • PropertyName : Gets or sets the property used to retrieve the value to filter by.
    • Operator : Gets or sets the NumericalOperator value which defines the logic behind the left and right operand comparison.
    • Value : Gets or sets the DateTime value used in the comparisons. This is the right operand of the comparison.
  • DelegateFilterDescriptor :

    • Filter : Gets or sets the IFilter implementation used to check whether a data item passes the filter or not.

Example

   <dataControls:RadListView ItemsSource="{Binding}">
        <dataControls:RadListView.Resources>
            <local:Key x:Key="filter" />
        </dataControls:RadListView.Resources>
        <dataControls:RadListView.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Name}" />
            </DataTemplate>
        </dataControls:RadListView.ItemTemplate>
        <dataControls:RadListView.FilterDescriptors>
            <dataCore:DelegateFilterDescriptor Filter="{StaticResource filter}" />
        </dataControls:RadListView.FilterDescriptors>
    </dataControls:RadListView>

        List<Item> list = new List<Item>();
        for (int i = 0; i < 10; i++)
        {
            list.Add(new Item { Id = i, Name = "Mr." + i });
        }
        this.DataContext = list;

public class Item
{
    public string Name { get; set; }
    public double Id { get; set; }
}

public class Key : IFilter
{
    public bool PassesFilter(object item)
    {
        return (item as Item).Id % 2 == 0;
    }
}