利用するINotifyPropertyChanged
:
XAML
<Window x:Class="INotifyPropertyChangedExample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
Title="INotifyPropertyChanged Example" Width="380" Height="100">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="150" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Label Content="Account Name:" />
<Label Grid.Row="1" Grid.Column="0" Content="Account Balance:" />
<ComboBox Grid.Row="0" Grid.Column="1" Width="200" Height="25" ItemsSource="{Binding AccountsCollection}" SelectedItem="{Binding SelectedAccount}" DisplayMemberPath="Name" />
<TextBox Grid.Column="1" Grid.Row="1" Width="200" Height="25" Text="{Binding SelectedAccount.Balance}" />
</Grid>
</Window>
C#
namespace INotifyPropertyChangedExample
{
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
public partial class MainWindow : Window, INotifyPropertyChanged
{
private ObservableCollection<Account> acctountsCollection;
public ObservableCollection<Account> AccountsCollection
{
get
{
return this.acctountsCollection;
}
set
{
this.acctountsCollection = value;
OnPropertyChanged();
}
}
private Account selectedAccount;
public Account SelectedAccount
{
get
{
return this.selectedAccount;
}
set
{
this.selectedAccount = value;
OnPropertyChanged();
}
}
public MainWindow()
{
InitializeComponent();
this.AccountsCollection = new ObservableCollection<Account>()
{
new Account { Id = 1, Name = "My super account", Balance = 123.45 },
new Account { Id = 2, Name = "My super account 2", Balance = 543.21 },
};
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName = null)
{
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
public class Account
{
public int Id { get; set; }
public string Name { get; set; }
public double Balance { get; set; }
}
}
この例ではObservableCollection
、Account
オブジェクトの をあなたにバインドし、プロパティを通じて選択されたComboBox
ものを追跡します。text プロパティを選択したオブジェクトのプロパティにバインドします。したがって、選択されたオブジェクトが に表示される値を変更すると、のが反映されます。Account
SelectedItem
TextBox
Balance
Account
Account
TextBox
Balance
Account
さらに、 の値を変更すると、オブジェクトTextBox
のBalance
値Account
が更新されます。