为什么我的 WPF 绑定不起作用？
我试图将列表绑定到列表框。在 Button1Click 方法中，MyClass 的新实例添加到我的 List<> 中，但在我的列表框中不可见。我的代码是：
public static class NotesEngine
{
public static List<Note> All;
static NotesEngine()
{
All = new List<Note>
{
new Note
{
Content = "test1",
}
};
}
public static List<Note> GetNotes()
{
return All;
}
}
这是我的表单情节和 ObjectDataProvider：
<ObjectDataProvider ObjectType="{x:Type NotesEngine}" x:Key="NotesList" MethodName="GetNotes"/>
......
<TabItem Header="test" DataContext="{Binding Source={StaticResource NotesList}}">
<ListBox HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
ItemTemplate="{StaticResource NotesListBoxDataTemplate}"
ItemsSource="{Binding }">
</ListBox>
</TabItem>
private void button2_Click(object sender, RoutedEventArgs e)
{
NotesEngine.All.Add(new Note
{
Content = "xx",
Images = new List<string>(),
LastEdit = DateTime.Now,
Title = "XASAC",
});
}
我做错了什么？
I trying to bind List to Listbox. And at the Button1Click method new instance of MyClass adds in my List<>, but that not visible in my listbox. There my code:
public static class NotesEngine
{
public static List<Note> All;
static NotesEngine()
{
All = new List<Note>
{
new Note
{
Content = "test1",
}
};
}
public static List<Note> GetNotes()
{
return All;
}
}
It is my form episode and ObjectDataProvider:
<ObjectDataProvider ObjectType="{x:Type NotesEngine}" x:Key="NotesList" MethodName="GetNotes"/>
......
<TabItem Header="test" DataContext="{Binding Source={StaticResource NotesList}}">
<ListBox HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
ItemTemplate="{StaticResource NotesListBoxDataTemplate}"
ItemsSource="{Binding }">
</ListBox>
</TabItem>
private void button2_Click(object sender, RoutedEventArgs e)
{
NotesEngine.All.Add(new Note
{
Content = "xx",
Images = new List<string>(),
LastEdit = DateTime.Now,
Title = "XASAC",
});
}
What I do wrong?
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您应该使用
ObservableCollection而不是List。 ObservableCollection 是一个通用的动态数据集合，它在添加、删除项目或刷新整个集合时提供通知（使用接口“INotifyCollectionChanged”）。 List 未实现INotifyCollectionChanged，WPF ListBox 使用该接口来更新 UI。请参阅
You should use
ObservableCollection<Node>instead ofList<Node>. ObservableCollection is a generic dynamic data collection that provides notifications (using an interface "INotifyCollectionChanged") when items get added, removed, or when the whole collection is refreshed. List does not implementsINotifyCollectionChanged, which interface is used by WPF ListBox to update UI.see