Question

我有一个定义RelayCommand的ViewModel，在View i中定义了ListView和ListItemTemplate。我需要通过单击列表项来调用带有列表项值的命令。

视图中的ListView

<ListView x:Name="listView1" SelectionMode="Single" ItemsSource="{Binding SimilarArtists}" MinWidth="360">
                <Interactivity:Interaction.Behaviors>
                    <Core:EventTriggerBehavior EventName="SelectionChanged">
                        <Core:InvokeCommandAction Command="{Binding ResolveSearchPageViewModel.SearchCommand, Converter={StaticResource SelectionChangedConverter}, Mode=OneWay, Source={StaticResource Locator}}" InputConverterParameter="{Binding ElementName=listView1}" />
                    </Core:EventTriggerBehavior>
                </Interactivity:Interaction.Behaviors>


                <ListView.ItemTemplate>
                    <DataTemplate>
                        <Grid MinWidth="360">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition MaxWidth="48"/>
                                <ColumnDefinition MinWidth="360"/>
                            </Grid.ColumnDefinitions>
                            <Image Grid.Column="0" Width="48" Source="../Assets/singer.png"/>
                            <Grid Grid.Column="1">
                                <Grid.RowDefinitions>
                                    <RowDefinition/>
                                    <RowDefinition/>
                                </Grid.RowDefinitions>
                                <TextBlock Margin="10, 10, 0, 10" FontSize="25" Text="{Binding Name}" TextWrapping="Wrap" Grid.Row="0"/>
                            </Grid>
                        </Grid>

                    </DataTemplate>
                </ListView.ItemTemplate>

            </ListView>

SelectionChangedConverter

public class SelectionChangedConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        var listView = parameter as ListView;

        return listView.SelectedItem;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        throw new NotImplementedException();
    }
}

RelayCommand

GoToSearchPageCommand = new RelayCommand<Artist>((item) =>
        {
            var it = item;
            _pageNavigationService.ToLoadingPage(item.Name);
        });

我需要传入SelectedItem的RelayCommand值并调用该命令。谢谢。最好的问候，德米特里

聚苯乙烯。我的英语不是很好，对不起。

Answer 1

您是否考虑过将listview的SelectedItem属性绑定到您的视图模型的属性？

你不需要命令。只要您声明了绑定，就会为您映射SelectedItem。

只需在视图模型中添加一个属性，该属性反映了ItemsSource所基于的类型，并在XAML中绑定到该属性。

<ListView SelectedItem = "{Binding MySelectedItem}"

ListView.SelectedItem作为CommandParameter WindowsRT XAML传递给ViewModel

1 个答案: