当 ItemsSource 为空或 null 时，MVVM WPF 用 Label 替换 ListBox

发布于 2024-11-02 10:02:47 字数 624 浏览 0 评论 0原文

我在 WPF (.NET 3.5) 中有这一行：

<ListBox ItemsSource="{Binding Locks}" Style="{DynamicResource FancyListBox}" />

我期望的行为是，当属性 Locks（ObservableCollection）为 null 或包含 0 个元素时，显示如下所示的标签而不是 ListBox。

<Label Content="No locks are present" Style="{DynamicResource FancyLabel}" />

到目前为止，我能想到的唯一解决方案是使用值转换器（即像 CollectionToVisibilityShowIfNull、CollectionToVisibilityShowIfNotNull 这样的转换器）将 Locks 属性绑定到可见性，但我不确定这是否是最佳解决方案。

... Visibility={Binding Locks, Converter={StaticResource CollectiontoVisibilityShowIfNull}} ..

感谢您的帮助！

原文

I have this line in WPF (.NET 3.5) :

<ListBox ItemsSource="{Binding Locks}" Style="{DynamicResource FancyListBox}" />

My desired behavior is that when the property Locks (an ObservableCollection) is either null or contains 0 elements, show a label like the one below instead of the ListBox.

<Label Content="No locks are present" Style="{DynamicResource FancyLabel}" />

The only solution I can think of so far is to bind the Locks property to visibility using a valueconverter (i.e. converters like CollectionToVisibilityShowIfNull, CollectionToVisibilityShowIfNotNull), but I am not sure if that is the best solution.

... Visibility={Binding Locks, Converter={StaticResource CollectiontoVisibilityShowIfNull}} ..

Thanks for any help!

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尾戒 2024-11-09 10:02:47

这是我通常做的事情：

<Grid>
    <ListBox Name="lstLocks" ItemsSource="{Binding Locks}" Style="{DynamicResource FancyListBox}" />
    <Label Name="lblNoLocks" Content="No locks are present" Style="{DynamicResource FancyLabel}" Visibility="Collapsed" />
</Grid>

...
<DataTrigger Binding="{Binding Locks.Count}" Value="0">
    <Setter TargetName="lstLocks" Property="Visibility" Value="Collapsed" />
    <Setter TargetName="lblNoLocks" Property="Visibility" Value="Visible" />
</DataTrigger>

Here's what I usually do:

<Grid>
    <ListBox Name="lstLocks" ItemsSource="{Binding Locks}" Style="{DynamicResource FancyListBox}" />
    <Label Name="lblNoLocks" Content="No locks are present" Style="{DynamicResource FancyLabel}" Visibility="Collapsed" />
</Grid>

...
<DataTrigger Binding="{Binding Locks.Count}" Value="0">
    <Setter TargetName="lstLocks" Property="Visibility" Value="Collapsed" />
    <Setter TargetName="lblNoLocks" Property="Visibility" Value="Visible" />
</DataTrigger>

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