C# ListBox SelectionChanged未被调用
下面是我的按钮列表框代码 我这里有两个问题: 1) SelectionChanged不触发以获取所选项目及其值 2) 我的列表框用于选择多个项目,因此当我选择一个项目时,按钮上不会设置背景 如何解决这些问题C# ListBox SelectionChanged未被调用,c#,wpf,windows,windows-phone-8,listbox,C#,Wpf,Windows,Windows Phone 8,Listbox,下面是我的按钮列表框代码 我这里有两个问题: 1) SelectionChanged不触发以获取所选项目及其值 2) 我的列表框用于选择多个项目,因此当我选择一个项目时,按钮上不会设置背景 如何解决这些问题 <ListBox Name="listBox" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" SelectionChanged=
<ListBox Name="listBox"
HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Stretch"
SelectionChanged="TopicListboxSelectionChanged"
ScrollViewer.VerticalScrollBarVisibility="Disabled">
<ListBox.ItemTemplate>
<DataTemplate>
<Button Name="AnswerCell"
Width="456"
Content="{Binding Path=Value}"
Background="#FFF2F4F7"
Foreground="Black"
Style="{StaticResource CellStyle}">
<Button.ContentTemplate>
<DataTemplate>
<TextBlock
Style="{StaticResource TextStyle}"
Padding="0,20,0,20"
TextAlignment="Center"
Text="{Binding}"/>
</DataTemplate>
</Button.ContentTemplate>
</Button>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
编辑
这里是带边框的文本块
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Name="AnswerCellBack" Margin="0,0,0,4" Orientation="Horizontal">
<Border Name="borderColor" Background="#FFF2F4F7">
<TextBlock Name="Answertext"
Width="456"
Padding="10,20,10,20"
TextAlignment="Center"
Text="{Binding Path=AnswerValue}"
Style="{StaticResource AnswerTextStyle}"/>
</Border>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
这里的问题:
1) 如何更改选择项的背景色,我已经在XAML中设置了边框背景
2) 如何添加多个项目选择。我认为您的问题在于包含按钮的数据模板。按钮通常会处理路由的mouseclick事件,并且不会为Listbox提供对其进行操作的操作,因此您不会获得选择事件 例如,尝试将您的按钮元素更改为边框,然后查看您的事件是否触发 使用附加属性并将选择更改绑定到命令也可能不是一个坏主意
public class SelectionChangeCommand : DependencyObject
{
public static bool GetIsRegistered(DependencyObject obj)
{
return (bool)obj.GetValue(IsRegisteredProperty);
}
public static void SetIsRegistered(DependencyObject obj, bool value)
{
obj.SetValue(IsRegisteredProperty, value);
}
// Using a DependencyProperty as the backing store for IsRegistered. This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsRegisteredProperty =
DependencyProperty.RegisterAttached("IsRegistered", typeof(bool), typeof(SelectionChangeCommand), new PropertyMetadata(false, new PropertyChangedCallback(RegisterForCommand)));
private static void RegisterForCommand(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is Selector)
{
Selector sel = (Selector)d;
if ((bool)e.NewValue)
{
sel.SelectionChanged += sel_SelectionChanged;
}
else
{
sel.SelectionChanged -= sel_SelectionChanged;
}
}
}
static void sel_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (sender is Selector)
{
Selector sel = (Selector)sender;
ICommand command = GetCommand(sel);
if (command!=null && command.CanExecute(null))
command.Execute(sel);
}
}
public static ICommand GetCommand(DependencyObject obj)
{
return (ICommand)obj.GetValue(CommandProperty);
}
public static void SetCommand(DependencyObject obj, ICommand value)
{
obj.SetValue(CommandProperty, value);
}
// Using a DependencyProperty as the backing store for Command. This enables animation, styling, binding, etc...
public static readonly DependencyProperty CommandProperty =
DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(SelectionChangeCommand), new PropertyMetadata(null));
}
在引用xmlns之后,您可以使用xaml中的代码,如下所示:
<ListBox kernelAttached:SelectionChangeCommand.Command="{Binding SelectedLinkCommand}"
kernelAttached:SelectionChangeCommand.IsRegistered="True" >
是完全不发射还是仅在第二次尝试时发射?改为使用轻触:)@ToniPetrina它不会向目标开火all@ToniPetrina你能给我举个例子吗?请同时查看我的编辑是的,我已尝试仅使用边框,并且我的选择更改事件正在触发。请查看我的编辑