我正在使用
public class ObservableDictionary : IObservableMap<string, object>
..在我的XAML中绑定设计时间数据。我使用的是创建默认Windows应用商店应用时创建的相同ObservableDictionary类。我的主页使用
public partial class MainPageViewModel : ViewModels.IMainPageViewModel
{
public ObservableCollection<Models.HubSection> HubSections { get; set; }
public ObservableCollection<ViewModels.IWritingItemViewModel> Writings { get; set; }
private readonly ObservableCollection<Models.ObservableDictionary> defaultDataModel;
public ObservableCollection<Models.ObservableDictionary> DefaultDataModel
{
get { return this.defaultDataModel; }
}
Models.ObservableDictionary hub = new Models.ObservableDictionary();
public MainPageViewModel()
{
this.defaultDataModel = new ObservableCollection<Models.ObservableDictionary>();
this.GetHubSections();
this.GetWritings();
this.DefaultDataModel.Add(hub);
}
private void GetHubSections()
{
var hubSections = DesignTimeData.Factory.GenHubSections();
this.HubSections = new ObservableCollection<Models.HubSection>();
foreach (var section in hubSections)
{
this.HubSections.Add(section);
}
Models.ObservableDictionary hub = new Models.ObservableDictionary();
hub["HubSections"] = this.HubSections;
}
private void GetWritings()
{
var writings = DesignTimeData.Factory.GenWritings();
this.Writings = new ObservableCollection<ViewModels.IWritingItemViewModel>();
var viewmodels = writings.Select((x, i) => new WritingItemViewModel
{
Writing = x,
VariableItemSize = Common.VariableItemSizes.Normal
});
this.Writings.AddRange(viewmodels);
Models.ObservableDictionary hub = new Models.ObservableDictionary();
hub["Writings"] = this.Writings;
if (viewmodels.Any())
{
SelWriting = viewmodels.First();
}
}
}
手动编码的数据来自
public static class Factory
{
public static IEnumerable<Models.HubSection> GenHubSections()
{
foreach (var hubSection in CreateHubSection())
{
yield return hubSection;
}
}
private static ObservableCollection<Models.HubSection> CreateHubSection()
{
var writing = new ObservableCollection<Models.HubSection>
{
#region HubSections
new Models.HubSection
{
UniqueId = "A6C99BE9-3DE5-4625-A763-55623D8CDA55",
Name = "WritingsHubSection",
IsHeaderInteractive = false,
ContentTemplate = "SectionWritingsTemplate",
HeaderTemplate = "",
Header = "WRITINGS",
ImagePath = "ms-appx:///Assets/StoreLogo.scale-180.png",
},
new Models.HubSection
{
UniqueId = "A6C99BE9-3DE5-4625-A763-55623D8CDA22",
Name = "SenarioHubSection",
IsHeaderInteractive = false,
ContentTemplate = "SectionSenarioTemplate",
HeaderTemplate = "",
Header = "SENARIOS",
ImagePath = "ms-appx:///Assets/StoreLogo.scale-180.png",
}
#endregion
};
return writing;
}
}
在我的XAML中，我使用
d:DataContext="{d:DesignInstance designTimeData:MainPageViewModel, IsDesignTimeCreatable=True}">
..用于实例化类以创建我的MainPage的设计时间数据
<Grid Background="{ThemeResource AppBackground}"
d:DataContext="{Binding DefaultDataModel[0]}"
DataContext="{Binding DefaultDataModel[0]}">
<Hub Margin="0,40,0,0">
<HubSection MinWidth="{Binding Width, Source={StaticResource WritingsSize}}"
Header="WRITINGS"
x:Name="WritingsHubSection">
<DataTemplate>
<ListView
x:Name="itemGridView"
ItemsSource="{Binding HubSections}"
Margin="-9,-14,0,0"
SelectionMode="Single">
<ListView.ItemTemplate>
<DataTemplate >
<Grid Height="250" Width="310" Margin="5,10,5,10" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}" Height="150">
<Image Source="{Binding ImagePath}" />
</Border>
<StackPanel Grid.Row="1" Margin="0,10,0,0">
<TextBlock Text="{Binding Name}" Style="{StaticResource TitleTextBlockStyle}" TextWrapping="NoWrap"/>
<TextBlock Text="{Binding Header}" Style="{StaticResource BodyTextBlockStyle}" MaxHeight="60" />
</StackPanel>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</DataTemplate>
</HubSection>
</Hub>
此代码通常用于通过 Diederik Krols ＆＃34; Using the Windows 8.1 Hub as an ItemsControl＆＃34;在自定义中心控件中创建HubSections，但我无法获取它工作，所以我将XAML简化为ListView以查看我是否可以解决问题。截至目前，当我运行App时，ListView会显示数据。
但是，当我删除
d:DataContext="{Binding DefaultDataModel[0]}"
DataContext="{Binding DefaultDataModel[0]}"
增加： 我在阅读＆＃34; Windows Store App Design-time DataContext＆＃34;之后做了一些改变。由Luke Pulpit提供，因为我们有同样的问题。我添加了Binding和Type属性，但我得到了相同的结果。
为了使这个问题更清楚，我的问题是ObservableDictionary：IObservableMap类，为什么我不能绑定到设计时数据的映射。
public class ObservableDictionary : IObservableMap<string, object>
{
private class ObservableDictionaryChangedEventArgs : IMapChangedEventArgs<string>
{
public ObservableDictionaryChangedEventArgs(CollectionChange change, string key)
{
this.CollectionChange = change;
this.Key = key;
}
public CollectionChange CollectionChange { get; private set; }
public string Key { get; private set; }
}
private Dictionary<string, object> _dictionary = new Dictionary<string, object>();
public event MapChangedEventHandler<string, object> MapChanged;
private void InvokeMapChanged(CollectionChange change, string key)
{
var eventHandler = MapChanged;
if (eventHandler != null)
{
eventHandler(this, new ObservableDictionaryChangedEventArgs(change, key));
}
}
public void Add(string key, object value)
{
this._dictionary.Add(key, value);
this.InvokeMapChanged(CollectionChange.ItemInserted, key);
}
public void Add(KeyValuePair<string, object> item)
{
this.Add(item.Key, item.Value);
}
public bool Remove(string key)
{
if (this._dictionary.Remove(key))
{
this.InvokeMapChanged(CollectionChange.ItemRemoved, key);
return true;
}
return false;
}
public bool Remove(KeyValuePair<string, object> item)
{
object currentValue;
if (this._dictionary.TryGetValue(item.Key, out currentValue) &&
Object.Equals(item.Value, currentValue) && this._dictionary.Remove(item.Key))
{
this.InvokeMapChanged(CollectionChange.ItemRemoved, item.Key);
return true;
}
return false;
}
public object this[string key]
{
get
{
return this._dictionary[key];
}
set
{
this._dictionary[key] = value;
this.InvokeMapChanged(CollectionChange.ItemChanged, key);
}
}
public void Clear()
{
var priorKeys = this._dictionary.Keys.ToArray();
this._dictionary.Clear();
foreach (var key in priorKeys)
{
this.InvokeMapChanged(CollectionChange.ItemRemoved, key);
}
}
public ICollection<string> Keys
{
get { return this._dictionary.Keys; }
}
public bool ContainsKey(string key)
{
return this._dictionary.ContainsKey(key);
}
public bool TryGetValue(string key, out object value)
{
return this._dictionary.TryGetValue(key, out value);
}
public ICollection<object> Values
{
get { return this._dictionary.Values; }
}
public bool Contains(KeyValuePair<string, object> item)
{
return this._dictionary.Contains(item);
}
public int Count
{
get { return this._dictionary.Count; }
}
public bool IsReadOnly
{
get { return false; }
}
public IEnumerator<KeyValuePair<string, object>> GetEnumerator()
{
return this._dictionary.GetEnumerator();
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this._dictionary.GetEnumerator();
}
public void CopyTo(KeyValuePair<string, object>[] array, int arrayIndex)
{
int arraySize = array.Length;
foreach (var pair in this._dictionary)
{
if (arrayIndex >= arraySize) break;
array[arrayIndex++] = pair;
}
}
}
我可以在运行时在代码中执行此操作并获得我需要的结果，
var w = this.DefaultDataModel[0];
ObservableCollection<Models.HubSection> hubSections = w["HubSections"] as ObservableCollection<Models.HubSection>;
但是当我这样做时，不是设计时数据：
d:DataContext="{Binding DefaultDataModel[0], Source={d:DesignInstance Type=designTimeData:MainPageViewModel, IsDesignTimeCreatable=True}}"
...
..
ListView x:Name="itemGridView" ItemsSource="{Binding HubSections}"
它显示数据以及我运行应用程序时，我不会收到任何警告或错误。任何帮助将不胜感激！
谢谢！......
答案 0 :(得分：0)
这不是问题的答案，但在做了更多的研究后，我终于意识到我太过技术化，同时又没有完全理解设计时数据的使用。
我应该真正寻找的显示结果，而不是我如何得到数据。
为浪费的帖子道歉！...