[英]WPF, MVVM, EventBehaviourFactory in ListView, binding event to command
[英]Binding Button command which inside ListView Item WPF MVVM
我有一个输出内容的 ListView。 共4列:章节号、标题、编辑按钮、删除按钮 点击按钮时,需要获取其所在的元素(例如章节号或章节名称)。 我尝试通过 ListView 名称和 FindAncestor 进行绑定,但什么也没发生。 请帮助解决问题或指出错误
XAML:
<ListView Name="TableOfContents"
ItemsSource="{Binding Path=ContentList}"
Background="{x:Null}" Width="600"
ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.CanContentScroll="True"
BorderBrush="{x:Null}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseDoubleClick">
<i:InvokeCommandAction
Command="{Binding Command}"
CommandParameter="{Binding ElementName=TableOfContents, Path=SelectedItem}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<ListView.View>
<GridView>
<GridViewColumn Width="50">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding ThemeID}" TextWrapping="Wrap"
Foreground="Black" FontSize="30"
TextAlignment="Center"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="460">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding ThemeName}" TextWrapping="Wrap"
Foreground="Black" FontSize="20"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="40">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="🖊" ToolTip="Редактировать"
Foreground="Black" FontSize="18"
Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType={x:Type ItemsControl}},
Path=TableOfContentsPageViewModel.EditTheme}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="40">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="❌" ToolTip="Удалить"
Foreground="Black" FontSize="18"
Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType={x:Type ItemsControl}},
Path=TableOfContentsPageViewModel.DeleteTheme}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
视图模型:
class TableOfContentsPageViewModel:BaseViewModel, IPageViewModel
{
public string SearchedChapter { get; set; }
public Visibility CanEdit { get; set; } = Visibility.Hidden;
public Theme SelectedTheme { get; set; }
public ObservableCollection<Theme> ContentList { get; set; }
public TableOfContentsPageViewModel()
{
ContentList = new ObservableCollection<Theme>(TrainSQL_Commands.GetAllThemes());
CanEdit = CurrentUser.Role == "Administrator" ? Visibility.Visible : Visibility.Hidden;
}
private ICommand _editTheme;
public ICommand EditTheme
{
get
{
return _editTheme ?? (_editTheme = new RelayCommand(x =>
{
MessageBox.Show("Edit theory");
}));
}
}
private ICommand _deleteTheory;
public ICommand DeleteTheme
{
get
{
return _deleteTheory ?? (_deleteTheory = new RelayCommand(x =>
{
MessageBox.Show("Delete theory");
}));
}
}
}
欢迎来到 SO!
RelativeSource 绑定到控件本身,而不是通过 DataContext (当您考虑它时这是有道理的)。 您当前正在绑定到路径TableOfContentsPageViewModel.DeleteTheme
,您需要将其更改为DataContext.TableOfContentsPageViewModel.DeleteTheme
。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.