我在listview中有一个按钮来删除所选项目.当我点击按钮RemoveSubjectCommand没有触发时.如果我把按钮放在列表视图之外它工作正常.这只是因为嵌套项目.我怎么解决这个问题？
<ListView HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
HorizontalContentAlignment="Stretch" Grid.ColumnSpan="3" Grid.Row="2"
ItemsSource="{Binding AssignedSubjects}">
<ListView.ItemContainerStyle>
<Style targettype="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Center" />
</Style>
</ListView.ItemContainerStyle>
<ListView.View>
<GridView>
<GridViewColumn Width="140" Header="Subjects" displayMemberBinding="{Binding Name}" />
<GridViewColumn Width="auto">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="X" Command="{Binding RemoveSubjectCommand}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
查看模型,
private ICommand removeSubjectCommand;
**
public ICommand RemoveSubjectCommand
{
get { return removeSubjectCommand ?? (removeSubjectCommand = new RelayCommand(param => this.RemoveSubject(),null)); }
}
**
private void RemoveSubject()
{ ***
}
如果我下面的代码,它将正常工作.
<ListView.InputBindings>
<KeyBinding Key="Delete" Command="{Binding RemoveSubjectCommand}" />
</ListView.InputBindings>
解决方法
那是因为按钮的DataContext是ListBoxItem DataContext.所以你需要转到父ListView DataContext.
一种方法是给ListView一个名字,并用元素名绑定
<ListView Name="lv" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
HorizontalContentAlignment="Stretch" Grid.ColumnSpan="3" Grid.Row="2"
ItemsSource="{Binding AssignedSubjects}">
<ListView.ItemContainerStyle>
<Style targettype="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Center" />
</Style>
</ListView.ItemContainerStyle>
<ListView.View>
<GridView>
<GridViewColumn Width="140" Header="Subjects" displayMemberBinding="{Binding Name}" />
<GridViewColumn Width="auto">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="X" Command="{Binding ElementName=lv,Path=DataContext.RemoveSubjectCommand}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>