分组LongListSelector:标题出现,项目不出现

Question

C#中的WinPhone 8项目.我正在尝试填充分组列表.显示组标题,但项目不显示.相关代码是:

class MyPage
{
    public class Group : IGrouping<string, string>
    {
        public string Title{get;set;}
        public string[] Items;

        public string Key
        {
            get { return Title; }
        }

        public IEnumerator<string> GetEnumerator()
        {
            return (Items as IEnumerable<string>).GetEnumerator();
        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            return Items.GetEnumerator();
        }
    }

    private Group[] m_ItemGroups =
        {
            new Group(){Title = "A", Items = new string[] {"A", "ASA"}},
            new Group(){Title = "X", Items = new string[] {"X", "XX"}},
        };

    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        TheList.ItemsSource = m_ItemGroups;
    }
}

和XAML:

<phone:LongListSelector
        x:Name="TheList"
        Grid.Row="1"
        IsGroupingEnabled="True"
        SelectionChanged="OnSelChanged"
        >

        <phone:LongListSelector.GroupHeaderTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Title}"
                   Style="{StaticResource PhoneTextGroupHeaderStyle}"
                   Foreground="{StaticResource PhoneForegroundBrush}" />
            </DataTemplate>
        </phone:LongListSelector.GroupHeaderTemplate>

        <phone:LongListSelector.ItemTemplate>
            <DataTemplate>
                <StackPanel Margin="0,0,0,17" Width="432" Orientation="Horizontal">
                    <TextBlock Text="Hello world" TextWrapping="Wrap" Width="345"/>
                </StackPanel>

            </DataTemplate>
        </phone:LongListSelector.ItemTemplate>

    </phone:LongListSelector>

这两种GetEnumerator()方法都没有被调用.该Key吸气剂是从来没有所谓,无论是.看起来列表不能将我的Group类识别为字符串集合.拜托,这里有什么问题？

项目模板很好.当我将列表更改为非分组时,我看到两个带有虚拟文本的项目.

string用自定义类替换项目类型没有帮助.

Answer 1

Seva是正确的,微软改变了你在Grouped模式中分配给ItemsSourcea 的类型要求LongListSelector.

您需要转换您正在使用的任何类来将项目从继承分组IEnumerable<T>为仅继承List<T>.

请参阅此处以获取答案的完整说明

实际上它很简单,这就是你可以使用WP8 LongListSelector 的Group类的例子如下所示:

    public class Group<T> : List<T>
{
    public Group(char name, IEnumerable<T> items) : base(items)
    {
        this.Letter = name;

    }



    public char Letter
    {
        get;
        set;
    }


}