一个列表框的简单的WPF数据绑定为一个字符串的ObservableCollection [英] Simple WPF DataBinding of a ListBox to an ObservableCollection of strings

问题描述

好吧，我只是不明白这一点。请告诉我，为什么我没有得到任何项目在我的列表框（应该是两个字符串空和东西现在）：

Okay, I just don't get it. Please tell me why I get no items in my ListBox (should be the two strings "empty" and "stuff" right now ):

XAML：

<Window.DataContext>
    <Windows:SettingsWindowModel x:Name="model"/>
</Window.DataContext>

<Window.Resources>
    <DataTemplate x:Key="ListItemTemplate">
        <ListBoxItem Content="{Binding}"  />
    </DataTemplate>
</Window.Resources>

<ListBox Name="listBoxActivities" SelectionChanged="ListBoxActivitiesSelectionChanged"
 ItemsSource="{Binding Path=IgnoredActivities}"
 HorizontalAlignment="Left" VerticalAlignment="Top" MinHeight="40" MinWidth="200"
 Padding="5,100,5,0" Height="100" Margin="0,207,0,0" ItemTemplate="{StaticResource ListItemTemplate}" />

在SettingsWindowModel：

In SettingsWindowModel:

    private ObservableCollection<String> _ignoredActivities;
    public ObservableCollection<String> IgnoredActivities
    {
        get
        {
            if (_ignoredActivities == null)
            {
                // empty
                _ignoredActivities = new ObservableCollection<String>() { "empty","stuff" };
            }
            return _ignoredActivities;
        }
    }

再说了，你需要知道什么？我是怎么忘了？

Anything more you need to know? What did I forget?

编辑： 也许我应该补充一点的VisualStudio + ReSharper的也没有显示下划线和编译错误。即使不是警告。

Maybe I should add that VisualStudio + ReSharper also show no underlines and compile errors. Not even warnings.

推荐答案

对不起球员，该数据在那里所有的时间。的问题是在视觉细节。填充也得到了施加于子容器列表框（或项目），的因此，项目未坐在列表的顶部。因为我已经但是在列表框的高度，该项目始终低于ListBox的可见高度。施坦格事调试。谢谢您的回答反正！

Sorry guys, the data was there all the time. The problem was in the visual details. The padding also got applied to a sub-container of the ListBox (or the items), therefore the items were not sitting at the top of the list. As I've but a height on the ListBox, the items always were below the visible height of the ListBox. Stange thing to debug. Thanks for your answers anyways!

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