0

我正在使用 Telerik 组合框，但我认为这个问题与标准 wpf 组合框有关。该控件绑定到“TableRecord”的可观察集合，该对象如下所示：

public enum RecordState
{
    Orginal, Added, Modified, Deleted
}

public class TableRecord<T> 
{
    public Guid Id { get; set; }
    public string DisplayName { get; set; }
    public T Record { get; set; }
    public RecordState State { get; set; }

    public TableRecord(Guid id, string displayName, T record, RecordState state)
    {
        Id = id;
        DisplayName = displayName;
        Record = record;
        State = state;
    }
}

这些“TableRecords”是这样保存和公开的：

private ObservableCollection<TableRecord<T>> _recordCollection = new ObservableCollection<TableRecord<T>>();
public ObservableCollection<TableRecord<T>>  Commands 
{
    get
    {
           return _recordCollection;
    }
}

我的 xml 看起来像这样：

<telerik:RadComboBox ItemsSource="{Binding Commands}" DisplayMemberPath="DisplayName" SelectedValuePath="Id" Height="22" SelectedItem="{Binding SelectedCommand, Mode=TwoWay}" />

我想要做的是更改 xaml（如果可能），以便它显示集合中的所有项目，除了“状态”值设置为“已删除”的项目。

我有一个想法，我可以使用数据触发器来做到这一点，因为我过去曾使用它们来根据内容设置文本颜色，但不确定我是否可以按照我需要的方式进行过滤。

4

1 回答 1

2

Best approach is to use CollectionViewSource for filtering. Define a collection view source in resources and key it.

<Window.Resources>
    <CollectionViewSource Source="{Binding Commands}" x:Key="source"/>
</Window.Resources>
<Grid>
    <ComboBox VerticalAlignment="Center" HorizontalAlignment="Center" Width="200" 
              ItemsSource="{Binding Source={StaticResource source}}"
              DisplayMemberPath="DisplayName"/>
</Grid>

In code behind, set Filter callback for collection view source,

    private void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        var source = this.Resources["source"] as CollectionViewSource;
        source.Filter += source_Filter;
    }

    private void source_Filter(object sender, FilterEventArgs e)
    {
        if (((TableRecord) e.Item).State == RecordState.Deleted)
        {
            e.Accepted = false;
        }
        else
        {
            e.Accepted = true;
        }
    }
于 2013-06-05T11:09:19.250 回答