我希望在列表框为空时显示默认消息,同样我使用以下代码,但此代码无效:
<HubSection x:Name="PivotFromAccount" Style="{StaticResource HubSectionStyle2}" >
<DataTemplate>
<Border Style="{StaticResource brdhubsectionstyle}">
<Grid Grid.Row="1" Style="{StaticResource GridMainStyleHubSession}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Border Style="{StaticResource brdheaderstyle}">
<TextBlock Text="From Account" Style="{StaticResource lblheaderstyle}" />
</Border>
<ListBox x:Name="lstAccountDetailsfrom" Grid.Row="1" ItemsSource="{Binding }"
Style="{StaticResource LstBoxStyleBranches}"
Tapped="lstAccountDetailsfrom_Tapped"
ItemContainerStyle="{StaticResource lstAccountliststyle}"
ItemTemplate="{StaticResource lstAccountlistDataTemplate}" >
</ListBox>
<TextBlock Margin="4" FontStyle="Italic" FontSize="12" Text="List is empty" x:Name="txtmessage" Grid.Row="1" Foreground="Black" />
<i:Interaction.Behaviors>
<ic:DataTriggerBehavior Binding="{Binding ElementName=lstAccountDetailsfrom, Path=Items.Count,Converter={StaticResource DataTriggerBehavior},Mode=TwoWay}" Value="0" ComparisonCondition="GreaterThan">
<ic:ChangePropertyAction TargetObject="{Binding ElementName=txtmessage}" PropertyName="Visibility" Value="Collapsed"/>
</ic:DataTriggerBehavior>
</i:Interaction.Behaviors>
</Grid>
</Border>
</DataTemplate>
</HubSection>
我尝试使用Ivalue转换器,如下所示,但它也没有多大帮助。始终向ValueConverter发送0计数
<TextBlock Margin="4" FontStyle="Italic" FontSize="12" Text="List is empty" x:Name="txtmessage" Grid.Row="1" Foreground="Black" Visibility="{Binding ElementName=lstAccountDetailsfrom,Converter={StaticResource DataTriggerBehavior},Mode=TwoWay}" />
答案 0 :(得分:0)
如果您的数据源是ObservableCollection
,则可以使用自定义Count
绑定到其IValueConverter
属性,而不是将0
转换为Visible
和{{1}转到1
并在Collapsed
上使用它。不需要任何行为。