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2013-08-08T05:03:20.323
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2013-08-08T05:03:20.323
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You need to set <code>UpdateSourceTrigger</code> to <code>Explicit</code> and on the <code>Click</code> event of the <code>Button</code> you need to update the binding source. The <code>Button</code>s <code>Click</code> event is executed first before <code>Command</code>. Hence the source properties can be updated in the <code>Click</code> event. I have modified your code to demonstrate this. Note: <ol> <li>I have written the view model in code behind for simplicity. </li> <li>I have used the <code>RelayCommand</code> from the <code>MVVMLight</code> library.</li> </ol> 1st XAML Change <pre><code> <Button Grid.Row="1" HorizontalAlignment="Left" VerticalAlignment="Top" Width="141" Height="23" Margin="310,40,0,0" Content="Update" Click="Button_Click" Command="{Binding UpdateCommand}"/> </code></pre> 2nd XAML Change <pre><code> <ListView Name="ListViewProducts" Grid.Row="1" Margin="4,109,12,23" ItemsSource="{Binding Path=Products}" SelectedItem="{Binding SelectedProduct}" > </code></pre> Code behind <pre><code>using GalaSoft.MvvmLight.Command; using System; using System.Collections.ObjectModel; using System.ComponentModel; using System.Windows; using System.Windows.Controls; using System.Windows.Input; namespace WPF2 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { txtID.GetBindingExpression(TextBox.TextProperty).UpdateSource(); txtName.GetBindingExpression(TextBox.TextProperty).UpdateSource(); txtPrice.GetBindingExpression(TextBox.TextProperty).UpdateSource(); } } public class MainWindowViewModel : INotifyPropertyChanged { public const string ProductsPropertyName = "Products"; private ObservableCollection<Product> _products; public ObservableCollection<Product> Products { get { return _products; } set { if (_products == value) { return; } _products = value; RaisePropertyChanged(ProductsPropertyName); } } private Product _SelectedProduct; public Product SelectedProduct { get { return _SelectedProduct; } set { _SelectedProduct = value; RaisePropertyChanged("SelectedProduct"); } } private ICommand _UpdateCommand; public ICommand UpdateCommand { get { if (_UpdateCommand == null) { _UpdateCommand = new RelayCommand(() => { MessageBox.Show( String.Format("From ViewModel:\n\n Updated Product : ID={0}, Name={1}, Price={2}", SelectedProduct.ProductId, SelectedProduct.Name, SelectedProduct.Price)); }); } return _UpdateCommand; } } public MainWindowViewModel() { _products = new ObservableCollection<Product> { new Product {ProductId=1, Name="Pro1", Price=11}, new Product {ProductId=2, Name="Pro2", Price=12}, new Product {ProductId=3, Name="Pro3", Price=13}, new Product {ProductId=4, Name="Pro4", Price=14}, new Product {ProductId=5, Name="Pro5", Price=15} }; } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; public void RaisePropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } #endregion } } </code></pre>
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1. POHow does this button click work in WPF MVVM?
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1. USAnand Murali
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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