使用文本框筛选 绑定到 xml 的列表视图

enter code here 嘿伙计们，我是 wpf 编程的新手，当用户在文本框中键入内容时，我很难过滤列表视图。 当尝试过滤时，我得到的只是一个黑名单视图......我相信这是由于我过滤的部分是节点的属性引起的，我不确定如何使用它来过滤

例我正在尝试使用项目的基本参考进行过滤

提前致谢

这是我的代码

    private bool FilterItem(object obj)
    {
        Item item = obj as Item;
        if (item == null) return false;
        string textFilter = Filtertxt.Text;
        if (textFilter.Trim().Length == 0) return true; // the filter is empty - pass all items
        // apply the filter
        if (item.ItemNum.ToLower().Contains(textFilter.ToLower())) return true;
        return false;
    }
    private void Filtertxt_TextChanged(object sender, TextChangedEventArgs e)
    {
        if (!this.IsInitialized) return;    // get out of here if the window is not initialized

        /// Get the default view from the listview
        ICollectionView view = CollectionViewSource.GetDefaultView(lviewItemsList.ItemsSource  );
        view.Filter = null;
        view.Filter = new Predicate<object>(FilterItem);
    }
My Xml struct 

    <Item quantity="0" baseRef="2" desc="BLANK Item, ">
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
    </Item>
    <Item quantity="0" baseRef="2" desc="BLANK Item, ">
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
        <Material selected="0" ref="2" color="" />
    </Item>

使用 xaml 中的 xpath 解析 XML

<ListView Name="lviewItemsList" 
           MouseDoubleClick="DataGrid_MouseDoubleClick"
              ItemsSource="{Binding Source={StaticResource plData}, XPath=/PickList/Items/Item}" 
              IsSynchronizedWithCurrentItem="True" Margin="87,32,63.9999999999991,61"
      KeyboardNavigation.TabNavigation="Continue" Grid.Row="1"  >
        <ListView.View>
            <GridView x:Name="Itemlist" ColumnHeaderContainerStyle="{StaticResource GridHeaderStyle}">
                <GridViewColumn  Header="Item" DisplayMemberBinding="{Binding XPath=@baseRef}"/>
                <GridViewColumn  Header ="Qty" CellTemplate="{StaticResource Qty}"/>
                <GridViewColumn Header="Finish" CellTemplate="{StaticResource ItemFin}" Width="0"/>
                <GridViewColumn Header="Description" DisplayMemberBinding="{Binding XPath=@desc}"/>
            </GridView>
        </ListView.View>
    </ListView>
enter code here

ItemNum是一个项目类..我试图作为一个对象传递..我真的迷失在这里

internal class Item : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    protected void FirePropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
    private string itemNum = "";
    public string ItemNum
    {
        get { return itemNum; }
        set { itemNum = value; FirePropertyChanged("ItemNum"); }
    }
    private string itemDesc = "";
    public string ItemDesc 
    {
        get { return itemDesc; }
        set { itemDesc = value; FirePropertyChanged("ItemDesc "); }
    }
    internal class ItemCollection : ObservableCollection<Item>
    {
    }
}

}