Receiving Change Notifications for Bound Data
<UserControl x:Class='SilverlightApplication3.MainPage'
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'
d:DesignWidth='640'
d:DesignHeight='480'
xmlns:local="clr-namespace:SilverlightApplication3">
<UserControl.Resources>
<local:EmployeeCollection x:Key="REF_EmployeeCollection"/>
<DataTemplate x:Key="DT_Employee">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding FirstName}" />
<TextBlock Text="{Binding LastName}"/>
</StackPanel>
</DataTemplate>
</UserControl.Resources>
<StackPanel>
<ListBox x:Name="lbx_Employees"
ItemTemplate="{StaticResource DT_Employee}"
ItemsSource="{StaticResource REF_EmployeeCollection}"
SelectionChanged="lbx_Employees_SelectionChanged" />
<Button x:Name="btn_New" Click="btn_New_Click" Content="New Employee"/>
<TextBox Text="{Binding FirstName, Mode=TwoWay}"/>
<TextBox Text="{Binding LastName, Mode=TwoWay}"/>
<TextBlock Text="Last"/>
<TextBlock Text="First"/>
<TextBlock Text="Name"/>
<TextBlock Text="Street"/>
<TextBox Text="{Binding Address.Street, Mode=TwoWay}"/>
<TextBlock Text="City"/>
<TextBlock Text="State"/>
<TextBlock Text="Zip"/>
<TextBox Text="{Binding Address.City, Mode=TwoWay}"/>
<TextBox Text="{Binding Address.State, Mode=TwoWay}"/>
<TextBox Text="{Binding Address.ZipCode, Mode=TwoWay}"/>
<TextBlock Text="Phone"/>
<TextBox Text="{Binding PhoneNum, Mode=TwoWay}"/>
<Button Content="Close" x:Name="btnClose" Click="btnClose_Click"/>
</StackPanel>
</UserControl>
//File: Page.xaml.cs
using System.Windows;
using System.Windows.Controls;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
namespace SilverlightApplication3
{
public class Employee : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(PropertyChangedEventArgs e)
{
if (PropertyChanged != null)
PropertyChanged(this, e);
}
public Employee()
{
}
private string _FirstName;
public string FirstName
{
get { return _FirstName; }
set
{
string OldVal = _FirstName;
if (OldVal != value)
{
_FirstName = value;
RaisePropertyChanged(new PropertyChangedEventArgs("FirstName"));
}
}
}
private string _LastName;
public string LastName
{
get { return _LastName; }
set
{
string OldVal = _LastName;
if (OldVal != value)
{
_LastName = value;
RaisePropertyChanged(new PropertyChangedEventArgs("LastName"));
}
}
}
private long _PhoneNum;
public long PhoneNum
{
get { return _PhoneNum; }
set
{
long OldVal = _PhoneNum;
if (OldVal != value)
{
_PhoneNum = value;
RaisePropertyChanged(new PropertyChangedEventArgs("PhoneNum"));
}
}
}
private Address _Address;
public Address Address
{
get { return _Address; }
set
{
Address OldVal = _Address;
if (OldVal != value)
{
_Address = value;
RaisePropertyChanged(new PropertyChangedEventArgs("Address"));
}
}
}
}
public class Address : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(PropertyChangedEventArgs e)
{
if (PropertyChanged != null)
PropertyChanged(this, e);
}
private string _Street;
public string Street
{
get { return _Street; }
set
{
string OldVal = _Street;
if (OldVal != value)
{
_Street = value;
RaisePropertyChanged(new PropertyChangedEventArgs("Street"));
}
}
}
private string _City;
public string City
{
get { return _City; }
set
{
string OldVal = _City;
if (OldVal != value)
{
_City = value;
RaisePropertyChanged(new PropertyChangedEventArgs("City"));
}
}
}
private string _State;
public string State
{
get { return _State; }
set
{
string OldVal = _State;
if (OldVal != value)
{
_State = value;
RaisePropertyChanged(new PropertyChangedEventArgs("State"));
}
}
}
private int _ZipCode;
public int ZipCode
{
get { return _ZipCode; }
set
{
int OldVal = _ZipCode;
if (OldVal != value)
{
_ZipCode = value;
RaisePropertyChanged(new PropertyChangedEventArgs("ZipCode"));
}
}
}
}
public class EmployeeCollection : ICollection<Employee>,
IList<Employee>,
INotifyCollectionChanged
{
private List<Employee> _internalList;
public EmployeeCollection()
{
_internalList = new List<Employee>();
}
public event NotifyCollectionChangedEventHandler CollectionChanged;
private void RaiseCollectionChanged(NotifyCollectionChangedEventArgs e)
{
if (CollectionChanged != null)
{
CollectionChanged(this, e);
}
}
public void Add(Employee item)
{
_internalList.Add(item);
RaiseCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add,item, _internalList.Count - 1));
}
public void Clear()
{
_internalList.Clear();
RaiseCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
public bool Remove(Employee item)
{
int idx = _internalList.IndexOf(item);
bool RetVal = _internalList.Remove(item);
if (RetVal)
RaiseCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, idx));
return RetVal;
}
public void RemoveAt(int index)
{
Employee item = null;
if (index < _internalList.Count)
item = _internalList[index];
_internalList.RemoveAt(index);
if (index < _internalList.Count)
RaiseCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, index));
}
public void Insert(int index, Employee item)
{
_internalList.Insert(index, item);
RaiseCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item, index));
}
public Employee this[int index]
{
get { return _internalList[index]; }
set
{
_internalList[index] = value;
RaiseCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, value, index));
}
}
public bool Contains(Employee item)
{
return _internalList.Contains(item);
}
public void CopyTo(Employee[] array, int arrayIndex)
{
_internalList.CopyTo(array, arrayIndex);
}
public int Count
{
get { return _internalList.Count; }
}
public bool IsReadOnly
{
get { return ((IList<Employee>)_internalList).IsReadOnly; }
}
public IEnumerator<Employee> GetEnumerator()
{
return _internalList.GetEnumerator();
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return (System.Collections.IEnumerator)_internalList.GetEnumerator();
}
public int IndexOf(Employee item)
{
return _internalList.IndexOf(item);
}
}
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
EmployeeCollection empColl = (EmployeeCollection)lbx_Employees.ItemsSource;
empColl.Add(new Employee
{
FirstName = "A",
LastName = "B",
PhoneNum = 2,
Address = new Address
{
Street = "2 Street",
City = "City",
State = "NY",
ZipCode = 10006
}
});
}
private void btn_New_Click(object sender, RoutedEventArgs e)
{
EmployeeCollection empColl = (EmployeeCollection)lbx_Employees.ItemsSource;
Employee newEmp = new Employee();
newEmp.Address = new Address();
empColl.Add(newEmp);
lbx_Employees.SelectedItem = newEmp;
}
private void lbx_Employees_SelectionChanged(object sender,SelectionChangedEventArgs e)
{
}
private void btnClose_Click(object sender, RoutedEventArgs e)
{
}
}
}
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