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POHow does this button click work in WPF MVVM?
 

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  1. POHow does this button click work in WPF MVVM?
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    <p>I'm starting to study about WFM MVVM pattern.</p> <p>But I can't understand why this <code>Button</code> click works without binding any event or action.</p> <p><strong>View</strong></p> <pre><code>&lt;Window x:Class="WPF2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:WPF2.ViewModel" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;vm:MainWindowViewModel x:Key="MainViewModel" /&gt; &lt;/Window.Resources&gt; &lt;Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource MainViewModel}}"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="80,7,0,0" Name="txtID" VerticalAlignment="Top" Width="178" Text="{Binding ElementName=ListViewProducts,Path=SelectedItem.ProductId}" /&gt; &lt;TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="80,35,0,0" Name="txtName" VerticalAlignment="Top" Width="178" Text="{Binding ElementName=ListViewProducts,Path=SelectedItem.Name}" /&gt; &lt;TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="80,61,0,0" Name="txtPrice" VerticalAlignment="Top" Width="178" Text="{Binding ElementName=ListViewProducts,Path=SelectedItem.Price}" /&gt; &lt;Label Content="ID" Grid.Row="1" HorizontalAlignment="Left" Margin="12,12,0,274" Name="label1" /&gt; &lt;Label Content="Price" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="12,59,0,0" Name="label2" VerticalAlignment="Top" /&gt; &lt;Label Content="Name" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="12,35,0,0" Name="label3" VerticalAlignment="Top" /&gt; &lt;Button Grid.Row="1" HorizontalAlignment="Left" VerticalAlignment="Top" Width="141" Height="23" Margin="310,40,0,0" Content="Update" /&gt; &lt;ListView Name="ListViewProducts" Grid.Row="1" Margin="4,109,12,23" ItemsSource="{Binding Path=Products}" &gt; &lt;ListView.View&gt; &lt;GridView x:Name="grdTest"&gt; &lt;GridViewColumn Header="Product ID" DisplayMemberBinding="{Binding ProductId}" Width="100"/&gt; &lt;GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" Width="250" /&gt; &lt;GridViewColumn Header="Price" DisplayMemberBinding="{Binding Price}" Width="127" /&gt; &lt;/GridView&gt; &lt;/ListView.View&gt; &lt;/ListView&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p><strong>ViewModel</strong></p> <pre><code>class MainWindowViewModel : INotifyPropertyChanged { public const string ProductsPropertyName = "Products"; private ObservableCollection&lt;Product&gt; _products; public ObservableCollection&lt;Product&gt; Products { get { return _products; } set { if (_products == value) { return; } _products = value; RaisePropertyChanged(ProductsPropertyName); } } public MainWindowViewModel() { _products = new ObservableCollection&lt;Product&gt; { 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> <p>I found this code from a tutorial i've read. When i click on a row from listview, the textbox values are set. And when I edit those values and click a button, the values on listview are updated.</p> <p>There is no event nor command bound on the button. So how do button click update the values from listview??</p>
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    1. USAnand Murali
    1. USNikko Reyes
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      1. POHow does this button click work in WPF MVVM?
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    1. COThat button doesn't do anything. The listbox takes care of itself.
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      1. POHow does this button click work in WPF MVVM?
      1. USRitch Melton
    2. COHow is that? Could you please explain more? Listview updates its value when the button is clicked.
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      1. POHow does this button click work in WPF MVVM?
      1. USNikko Reyes
    3. COI'm pretty sure that if you set focus elsewhere the listbox would update. Its the fact that you are done editing the listbox that causes it to update when it loses focus.
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      1. POHow does this button click work in WPF MVVM?
      1. USRitch Melton
 

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Guidance
A row detail

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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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