我正在尝试为Windows 8.1的Hub应用程序实现以下数据模型：
namespace TrialAPP.Data
{
public class SamplePoemItem
{
public SamplePoemItem(String poemId, String poemtitle, String poemmean)
{
this.PoemId = poemId;
this.PoemTitle = poemtitle;
this.PoemMean = poemmean;
}
public string PoemId { get; private set; }
public string PoemTitle { get; private set; }
public string PoemMean { get; private set; }
public override string ToString()
{
return this.PoemTitle;
}
}
/// <summary>
/// Generic item data model.
/// </summary>
public class SampleDataItem
{
public SampleDataItem(String uniqueId, String title, String subtitle, String imagePath, String description, String content)
{
this.UniqueId = uniqueId;
this.Title = title;
this.Subtitle = subtitle;
this.Description = description;
this.ImagePath = imagePath;
this.Content = content;
this.Poems = new ObservableCollection<SamplePoemItem>();
}
public string UniqueId { get; private set; }
public string Title { get; private set; }
public string Subtitle { get; private set; }
public string Description { get; private set; }
public string ImagePath { get; private set; }
public string Content { get; private set; }
public ObservableCollection<SamplePoemItem> Poems { get; private set; }
public override string ToString()
{
return this.Title;
}
}
/// <summary>
/// Generic group data model.
/// </summary>
public class SampleDataGroup
{
public SampleDataGroup(String uniqueId, String title, String subtitle, String imagePath, String description)
{
this.UniqueId = uniqueId;
this.Title = title;
this.Subtitle = subtitle;
this.Description = description;
this.ImagePath = imagePath;
this.Items = new ObservableCollection<SampleDataItem>();
}
public string UniqueId { get; private set; }
public string Title { get; private set; }
public string Subtitle { get; private set; }
public string Description { get; private set; }
public string ImagePath { get; private set; }
public ObservableCollection<SampleDataItem> Items { get; private set; }
public override string ToString()
{
return this.Title;
}
}
/// <summary>
/// Creates a collection of groups and items with content read from a static json file.
///
/// SampleDataSource initializes with data read from a static json file included in the
/// project. This provides sample data at both design-time and run-time.
/// </summary>
public sealed class SampleDataSource
{
private static SampleDataSource _sampleDataSource = new SampleDataSource();
private ObservableCollection<SampleDataGroup> _groups = new ObservableCollection<SampleDataGroup>();
private ObservableCollection<SamplePoemItem> _poems = new ObservableCollection<SamplePoemItem>();
public ObservableCollection<SampleDataGroup> Groups
{
get { return this._groups; }
}
public ObservableCollection<SamplePoemItem> Poems
{
get { return this._poems; }
}
public static async Task<IEnumerable<SampleDataGroup>> GetGroupsAsync()
{
await _sampleDataSource.GetSampleDataAsync();
return _sampleDataSource.Groups;
}
public static async Task<IEnumerable<SamplePoemItem>> GetPoemsAsync()
{
await _sampleDataSource.GetSampleDataAsync();
return _sampleDataSource.Poems;
}
public static async Task<SampleDataGroup> GetGroupAsync(string uniqueId)
{
await _sampleDataSource.GetSampleDataAsync();
// Simple linear search is acceptable for small data sets
var matches = _sampleDataSource.Groups.Where((group) => group.UniqueId.Equals(uniqueId));
if (matches.Count() == 1) return matches.First();
return null;
}
public static async Task<SampleDataItem> GetItemAsync(string uniqueId)
{
await _sampleDataSource.GetSampleDataAsync();
// Simple linear search is acceptable for small data sets
var matches = _sampleDataSource.Groups.SelectMany(group => group.Items).Where((item) => item.UniqueId.Equals(uniqueId));
if (matches.Count() == 1) return matches.First();
return null;
}
public static async Task<SamplePoemItem> GetPoemAsync(string poemid)
{
await _sampleDataSource.GetSampleDataAsync();
//Simple linear search for Poem data sets
// var matches = _sampleDataSource.Poems.SelectMany(item => item.PoemTitle).Where((poemtitle) => poemid.Equals(poemid));
var matches = _sampleDataSource.Poems.Where((poemtitle) => poemid.Equals(poemid));
if (matches.Count() == 1) return matches.First();
return null;
}
private async Task GetSampleDataAsync()
{
if (this._groups.Count != 0)
return;
Uri dataUri = new Uri("ms-appx:///DataModel/SampleData.json");
StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(dataUri);
string jsonText = await FileIO.ReadTextAsync(file);
JsonObject jsonObject = JsonObject.Parse(jsonText);
JsonArray jsonArray = jsonObject["Groups"].GetArray();
foreach (JsonValue groupValue in jsonArray)
{
JsonObject groupObject = groupValue.GetObject();
SampleDataGroup group = new SampleDataGroup(groupObject["UniqueId"].GetString(),
groupObject["Title"].GetString(),
groupObject["Subtitle"].GetString(),
groupObject["ImagePath"].GetString(),
groupObject["Description"].GetString());
foreach (JsonValue itemValue in groupObject["Items"].GetArray())
{
JsonObject itemObject = itemValue.GetObject();
group.Items.Add(new SampleDataItem(itemObject["UniqueId"].GetString(),
itemObject["Title"].GetString(),
itemObject["Subtitle"].GetString(),
itemObject["ImagePath"].GetString(),
itemObject["Description"].GetString(),
itemObject["Content"].GetString()));
foreach (JsonValue poemValue in itemObject["Poems"].GetArray())
{
JsonObject poemObject = poemValue.GetObject();
Poems.Add(new SamplePoemItem(poemObject["PoemId"].GetString(),
poemObject["PoemTitle"].GetString(),
poemObject["PoemMean"].GetString()));
}
}
this.Groups.Add(group);
}
}
}
}
此模型的数据如下：
{
"Groups": [
{
"UniqueId": "Group-1",
"Title": "Group Title: 1",
"Subtitle": "Group subtitle: 1",
"ImagePath": "Assets/DarkGray.png",
"Description": "Group Description: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus tempor scelerisque lorem in vehicula. Aliquam tincidunt, lacus ut sagittis tristique, turpis massa volutpat augue, eu rutrum ligula ante a ante",
"Items": [
{
"UniqueId": "Group-1-Item-1",
"Title": "Item Title: 1",
"Subtitle": "Item Subtitle: 1",
"ImagePath": "Assets/LightGray.png",
"Description": "Item Description:",
"Content": "",
"Poems": [
{
"PoemId": "PoemId",
"PoemTitle": "PoemTitle",
"PoemMean": "PoemMean"
},
{
"PoemId": "PoemId1",
"PoemTitle": "PoemTitle2",
"PoemMean": "PoemMean2"
}
]
}
]
}
]
}
这是我在显示数据的ItemPage.Xaml。
<Grid x:Name="LayoutRoot">
<Grid.ChildrenTransitions>
<TransitionCollection>
<EntranceThemeTransition/>
</TransitionCollection>
</Grid.ChildrenTransitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!-- Title Panel -->
<StackPanel Grid.Row="0" Margin="19,0,0,0">
<TextBlock x:Uid="Header" Text="application name" Style="{ThemeResource TitleTextBlockStyle}" Margin="0,12,0,0" />
<TextBlock d:DataContext="{Binding Groups[0].Items[0], Source={d:DesignData Source=../TrialAPP.Shared/DataModel/SampleData.json, Type=data:SampleDataSource}}" Text="{Binding Title}" Style="{ThemeResource HeaderTextBlockStyle}" Margin="0,-6.5,0,26.5" CharacterSpacing="{ThemeResource PivotHeaderItemCharacterSpacing}"/>
</StackPanel>
<!--TODO: Content should be placed within the following grid
to show details for the current item -->
<Grid Grid.Row="1" x:Name="ContentRoot" Margin="19,9.5,19,0">
<ListView
x:Name="PoemListView"
AutomationProperties.AutomationId="PoemListView"
AutomationProperties.Name="Poems In Item"
TabIndex="1"
Grid.Row="1"
ItemsSource="{Binding Poems}"
IsItemClickEnabled="True"
ItemClick="PoemView_PoemClick"
SelectionMode="None"
IsSwipeEnabled="False"
Margin="19,0,0,0">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.Column="1" VerticalAlignment="Top" Margin="15,0,-295.833,-229" Height="312">
<TextBlock Text="{Binding PoemId}" Style="{ThemeResource ListViewItemTextBlockStyle}"/>
<TextBlock Text="{Binding PoemTitle}" Style="{ThemeResource ListViewItemContentTextBlockStyle}" Foreground="{ThemeResource PhoneMidBrush}"/>
<TextBlock Text="{Binding PoemMean}" Style="{ThemeResource ListViewItemSubheaderTextBlockStyle}"/>
</StackPanel>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
</Grid>
问题是ItemPage.Xaml在预览中显示完美。但是当我部署应用程序时，我在ItemPage.Xaml中没有任何内容。
我做错了什么？在构建期间我没有收到任何错误/警告。