我有usercontrol,它有datagrid。这个usercontrol被添加到WPF主窗口。我正在通过bubble事件处理gridrow选择更改事件。
<ListBox x:Name="myListBox" Grid.Row="0"
ItemsSource="{Binding Path=_myControl}"
ScrollViewer.VerticalScrollBarVisibility="Auto"
SelectedItem="{Binding CurrentItem}" SelectedIndex="1">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<local:UCSearchEntity GridRowSelectionConfirmed="{Binding Path=UCSearchEntity_GridRowSelectionConfirmed}" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
public class MyViewModel:INotifyPropertyChanged
{
}
错误为Provide value on 'System.Windows.Data.Binding' threw an exception.
如何在主窗口viewModel中访问此usercontrol事件?
答案 0 :(得分:0)
您不能在主窗口上绑定诸如此类事件之类的事件:
<Window DataGrid.GridRowSelectionConfirmed="GridRowSelectionConfirmed">
和GridRowSelectionConfirmed将是主窗口中的方法 上面的xaml是主窗口xaml中的一个片段。
如果你想坚持使用MVVM,那么你必须开始使用行为,但这是一个更高级的概念。需要这样的行为来附加一个命令,您可以将该数据绑定到一个事件,否则该事件不像您尝试那样可绑定。你看我正在利用交互性,如果你想做同样的事情,你需要混合sdk。一个例子:
public class AddingNewItemBehavior : Behavior<DataGrid>
{
public static readonly DependencyProperty CommandProperty
= DependencyProperty.Register("Command", typeof(ICommand), typeof(AddingNewItemBehavior), new PropertyMetadata());
public ICommand Command
{
get { return (ICommand)GetValue(CommandProperty); }
set { SetValue(CommandProperty, value); }
}
protected override void OnAttached()
{
AssociatedObject.AddingNewItem += AssociatedObject_OnAddingNewItem;
}
private void AssociatedObject_OnAddingNewItem(object sender, AddingNewItemEventArgs addingNewItemEventArgs)
{
AddingNewItem addingNewItem = new AddingNewItem();
Command.Execute(addingNewItem);
addingNewItemEventArgs.NewItem = addingNewItem.NewItem;
}
}
这是我在数据网格上添加的新行为。
这是一个简化的例子,我利用这种行为:
<UserControl x:Class="Interstone.Configuratie.Views.GraveerFiguurAdminUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:iCeTechControlLibrary="clr-namespace:ICeTechControlLibrary;assembly=ICeTechControlLibrary"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<DataGrid ItemsSource="{Binding ZandstraalImageTypes.View}" AutoGenerateColumns="False"
VerticalGridLinesBrush="#FFC9CACA" HorizontalGridLinesBrush="#FFC9CACA" RowHeaderWidth="50"
>
<i:Interaction.Behaviors>
<iCeTechControlLibrary:AddingNewItemBehavior Command="{Binding AddingNewCommand}"/>
</i:Interaction.Behaviors>
<DataGrid.Columns>
<DataGridTextColumn Header="Categorie" Binding="{Binding TypeNaam}" Width="*"/>
</DataGrid.Columns>
</DataGrid>
</Grid>