Object Binding
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Title="ListBinding" Height="325" Width="400">
<Window.Resources>
<ObjectDataProvider x:Key="Family" ObjectType="{x:Type local:RemoteEmployeesLoader}"
IsAsynchronous="True" MethodName="LoadEmployees">
<ObjectDataProvider.MethodParameters>
<sys:String>http://host/d.dat</sys:String>
<sys:String>http://host/d2.dat</sys:String>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<local:AgeToForegroundConverter x:Key="ageConverter" />
<DataTemplate DataType="{x:Type local:Employee}">
<TextBlock>
<TextBlock Text="{Binding Path=Name}" />
(age: <TextBlock Text="{Binding Path=Age}" Foreground="{Binding Path=Age, Converter={StaticResource ageConverter}}" />)
</TextBlock>
</DataTemplate>
</Window.Resources>
<StackPanel DataContext="{StaticResource Family}">
<ListBox ItemsSource="{Binding}" IsSynchronizedWithCurrentItem="True">
<ListBox.GroupStyle>
<x:Static Member="GroupStyle.Default" />
</ListBox.GroupStyle>
</ListBox>
<TextBlock>Name:</TextBlock>
<TextBox Text="{Binding Path=Name}" />
<TextBlock>Age:</TextBlock>
<TextBox Text="{Binding Path=Age}" Foreground="{Binding Path=Age, Converter={StaticResource ageConverter}}" />
<Button Name="birthdayButton">Birthday</Button>
<Button Name="backButton"><</Button>
<Button Name="forwardButton">></Button>
<Button Name="addButton">Add</Button>
<Button Name="sortButton">Sort</Button>
<Button Name="filterButton">Filter</Button>
<Button Name="groupButton">Group</Button>
</StackPanel>
</Window>
//File:Window.xaml.cs
using System;
using System.Text;
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.Shapes;
using System.Collections.Generic;
using System.Diagnostics;
using System.ComponentModel;
using System.Collections.ObjectModel;
using System.Collections;
namespace WpfApplication1 {
public class Employee : INotifyPropertyChanged {
public event PropertyChangedEventHandler PropertyChanged;
protected void Notify(string propName) {
if( this.PropertyChanged != null ) {
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
string name;
public string Name {
get { return this.name; }
set {
this.name = value;
Notify("Name");
}
}
int age;
public int Age {
get { return this.age; }
set {
this.age = value;
Notify("Age");
}
}
public Employee() { }
public Employee(string name, int age) {
this.name = name;
this.age = age;
}
}
public class Employees : ObservableCollection<Employee> { }
public class RemoteEmployeesLoader {
public Employees LoadEmployees(string url1, string url2) {
Employees employees = new Employees();
employees.Add(new Employee("A", 31));
employees.Add(new Employee("B", 42));
employees.Add(new Employee("C", 68));
return employees;
}
}
public partial class Window1 : Window {
public Window1() {
InitializeComponent();
this.birthdayButton.Click += birthdayButton_Click;
this.backButton.Click += backButton_Click;
this.forwardButton.Click += forwardButton_Click;
this.addButton.Click += addButton_Click;
this.sortButton.Click += sortButton_Click;
this.filterButton.Click += filterButton_Click;
this.groupButton.Click += groupButton_Click;
}
ICollectionView GetFamilyView() {
DataSourceProvider provider = (DataSourceProvider)this.FindResource("Family");
Employees employees = (Employees)provider.Data;
return CollectionViewSource.GetDefaultView(employees);
}
void birthdayButton_Click(object sender, RoutedEventArgs e) {
ICollectionView view = GetFamilyView();
Employee person = (Employee)view.CurrentItem;
++person.Age;
Console.WriteLine(person.Name);
Console.WriteLine(person.Age);
}
void backButton_Click(object sender, RoutedEventArgs e) {
ICollectionView view = GetFamilyView();
view.MoveCurrentToPrevious();
if( view.IsCurrentBeforeFirst ) {
view.MoveCurrentToFirst();
}
}
void forwardButton_Click(object sender, RoutedEventArgs e) {
ICollectionView view = GetFamilyView();
view.MoveCurrentToNext();
if( view.IsCurrentAfterLast ) {
view.MoveCurrentToLast();
}
}
void addButton_Click(object sender, RoutedEventArgs e) {
DataSourceProvider provider = (DataSourceProvider)this.FindResource("Family");
Employees employees = (Employees)provider.Data;
employees.Add(new Employee("EE", 67));
}
class EmployeeSorter : IComparer {
public int Compare(object x, object y) {
Employee lhs = (Employee)x;
Employee rhs = (Employee)y;
int nameCompare = lhs.Name.CompareTo(rhs.Name);
if( nameCompare != 0 )
return nameCompare;
return rhs.Age - lhs.Age;
}
}
void sortButton_Click(object sender, RoutedEventArgs e) {
ListCollectionView view = (ListCollectionView)GetFamilyView();
if( view.CustomSort == null ) {
view.CustomSort = new EmployeeSorter();
}
else {
view.CustomSort = null;
}
}
void filterButton_Click(object sender, RoutedEventArgs e) {
ICollectionView view = GetFamilyView();
if( view.Filter == null ) {
view.Filter = delegate(object item) {
return ((Employee)item).Age >= 25;
};
}
else {
view.Filter = null;
}
}
void groupButton_Click(object sender, RoutedEventArgs e) {
ICollectionView view = GetFamilyView();
if( view.GroupDescriptions.Count == 0 ) {
view.GroupDescriptions.Add(new PropertyGroupDescription("Age"));
}
else {
view.GroupDescriptions.Clear();
}
}
}
public class AgeToForegroundConverter : IValueConverter {
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
Debug.Assert(targetType == typeof(Brush));
int age = int.Parse(value.ToString());
return (age > 25 ? Brushes.Red : Brushes.Black);
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
throw new NotImplementedException();
}
}
}
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