我正在尝试基本使用CollectionViewSource,但似乎缺少某些东西,因为它无法正常工作。这是我的XAML代码:
<Window.Resources>
<CollectionViewSource Source="{Binding loc:MainVM.Instance.MapItems}" x:Key="MapCV">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="SourceProject" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Window.Resources>
<ListBox ItemsSource="{StaticResource MapCV}" HorizontalContentAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="2*"/>
<ColumnDefinition Width="2*"/>
<ColumnDefinition Width="50"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding SourceType, Converter={StaticResource WorkItemTypeToStringConverter}}"/>
<ComboBox Grid.Column="1" SelectedItem="{Binding DestType}" ItemsSource="{Binding WorkItemTypesForCurrentDestProject, Source={x:Static loc:MainMediator.Instance}, diagnostics:PresentationTraceSources.TraceLevel=High}" DisplayMemberPath="Name" />
<Button Grid.Column="2" Content="{Binding PercentMapped}"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
代码可以编译通过,但是运行应用时出现以下错误:
无法将属性“ItemsSource”中的值转换为类型“System.Collections.IEnumerable”的对象。 “System.Windows.Data.CollectionViewSource”不是属性“ItemsSource”的有效值。 位于标记文件“WIAssistant;component/main.xaml”的对象“System.Windows.Controls.ListBox”处出错。
这是我正在附加到的集合:
// The mappings used to copy the values of the fields of one WorkItem to another.
public ObservableCollection<WorkItemTypeMapping> WorkItemTypeMappings
{
get { return (ObservableCollection<WorkItemTypeMapping>)
GetValue(WorkItemTypeMappingsProperty); }
set { SetValue(WorkItemTypeMappingsProperty, value); }
}
public static readonly DependencyProperty WorkItemTypeMappingsProperty =
DependencyProperty.Register("WorkItemTypeMappings",
typeof(ObservableCollection<WorkItemTypeMapping>), typeof(MainMediator),
new UIPropertyMetadata(null));
我只想对对象 Project SourceProject
进行简单的分组,不想为此创建树形视图。