Defaut view + defaut filtering

Question

This is the data source in xml.
<?xml version="1.0" encoding="UTF-8"?>
<dataroot xmlns:od="urn:schemas-microsoft-com:officedata" generated="2011-06-04T14:21:45">
<Product>
<ID>101</ID>
<Name>Old Book</Name>
<Price>10</Price>
</Product>
<Product>
<ID>105</ID>
<Name>New Book</Name>
<Price>20</Price>
</Product>
<Product>
<ID>110</ID>
<Name>Video Tape</Name>
<Price>25</Price>
</Product>
<Product>
<ID>112</ID>
<Name>Video Game</Name>
<Price>30</Price>
</Product>
<Product>
<ID>130</ID>
<Name>Candy Bar</Name>
<Price>5</Price>
</Product>
</dataroot>
This this the MainWindow.xmal
MainWindow.xmal
<Window x:Class="FilterText.MainWindow"
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" mc:Ignorable="d"
x:Name="Window"
Title="MainWindow"
Width="374" Height="190">
<Window.Resources>
<DataTemplate x:Key="ProductTemplate">
<StackPanel Orientation="Horizontal" Width="305.56">
<TextBlock Text="{Binding XPath=ID}" Margin="10,0,0,0"/>
<TextBlock Text="{Binding XPath=Name}" Margin="10,0,0,0"/>
<TextBlock Text="{Binding XPath=Price}" Margin="10,0,0,0"/>
</StackPanel>
</DataTemplate>
</Window.Resources>
<Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource ProductData}}">
<ListBox x:Name="myListBox" ItemTemplate="{DynamicResource ProductTemplate}" ItemsSource="{Binding XPath=/dataroot/Product}" Margin="8,8,8,0" Height="90" VerticalAlignment="Top"/>
<TextBox x:Name="myTextBox" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Bottom" Margin="8,0,8,30.04" d:LayoutOverrides="VerticalAlignment"/>
<Button x:Name="filterBtn" Content="Filter" VerticalAlignment="Bottom" Margin="142,0,141,4.08" Click="filterBtn_Click_1"/>
</Grid>
</Window>
MainWindow.xmal.cs.
//In real life, the XML data source is big.
//Due to performance issue, view needs to be filtered before it is loaded into myListBox.
//So I put the filtering logic under InitializeComponent().
//No compiling Error message. But the program does not run.
using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace FilterText
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
//In real life, the XML data source is big.
//Due to performance issue, view needs to be filtered before it is loated into myListBox.
//So I put the filtering logic under InitializeComponent().
//No compiling Error message. But the programe does not run.
public MainWindow()
InitializeComponent();
ICollectionView view = CollectionViewSource.GetDefaultView(myListBox.ItemsSource);
view.Filter = X => ((XmlElement)X)["ID"].InnerText.Contains("101");
private void filterBtn_Click(objecventArgs e)
ICollectionView view = CollectionViewSource.GetDefaultView(myListBox.ItemsSource);
view.Filter = X => ((XmlElement)X)["ID"].InnerText.Contains(myTextBox.Text);

Answer 1

Hi Richard,
>>Due to performance issue, view needs to be filtered before it is loaded into myListBox
We could create XmlDataProvider from code behind and handle
DataChanged event, in this event, filter and set binding for ListBox:
XmlDataProvider xdp;
public MainWindow()
InitializeComponent();
xdp = new XmlDataProvider() { Source = new Uri(AppDomain.CurrentDomain.BaseDirectory + "product2.xml"), XPath = "/dataroot/Product" };
xdp.DataChanged += xdp_DataChanged;
this.Cursor = Cursors.Wait;
void xdp_DataChanged(object sender, EventArgs e)
ICollectionView view = RefineList();
if (view.Filter == null)
view.Filter = delegate(object item)
return ((XmlElement)item)["ID"].InnerText.Contains("101");
else
view.Filter = null;
Binding newBinding = new Binding();
newBinding.Source = xdp;
myListBox.SetBinding(ListBox.ItemsSourceProperty, newBinding);
this.Cursor = Cursors.Arrow;
ICollectionView RefineList()
DataSourceProvider provider = (DataSourceProvider)xdp;
return CollectionViewSource.GetDefaultView(provider.Data);
XAML:
<Window.Resources>
<DataTemplate x:Key="ProductTemplate">
<StackPanel Orientation="Horizontal" Width="305.56">
<TextBlock Text="{Binding XPath=ID}" Margin="10,0,0,0"/>
<TextBlock Text="{Binding XPath=Name}" Margin="10,0,0,0"/>
<TextBlock Text="{Binding XPath=Price}" Margin="10,0,0,0"/>
</StackPanel>
</DataTemplate>
</Window.Resources>
<Grid x:Name="LayoutRoot" Loaded="LayoutRoot_Loaded">
<ListBox x:Name="myListBox" ItemTemplate="{DynamicResource ProductTemplate}" Margin="8,8,8,0" Height="90" VerticalAlignment="Top"/>
<TextBox x:Name="myTextBox" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Bottom" Margin="8,0,8,30.04" d:LayoutOverrides="VerticalAlignment"/>
<Button x:Name="filterBtn" Content="Filter" VerticalAlignment="Bottom" Margin="142,0,141,4.08" Click="filterBtn_Click_1"/>
</Grid>
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