私はクラスのニュースを持っています
public class News : ObservableCollection<New>
{
public News()
: base()
{
}
}
Aクラス New
public class New : INotifyPropertyChanged
{
public PhotoAttachments Photo
{
get
{
return photoAttachments;
}
set
{
photoAttachments = value;
OnPropertyChanged("Photo");
}
}
// some fields such as date, text, id, sourceName etc
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string info)
{//realisation of method}
public PhotoAttachments photoAttachments = new PhotoAttachments(); // it is a collection, such as News, but it contains objects of class PhotoAttachment, which have property with string url to photo
}
InitializeComponent();私が書いた後
this.listBox.ItemsSource = NewsList;
、クラスNewのオブジェクトを含むリストボックスがあります。これらのリストボックスで、別のリストボックスを作成し、PhotoAttachments コレクションで埋めようとしました。ここで問題が発生しました。写真付きのリストボックスに写真が表示されません(ただし、存在します)。XAML は次のとおりです。
// I can select different <local:NewsTemplateSelector.Photos>
//style of listbox <DataTemplate>
//using NewsTemplateSelector <Border BorderBrush="Red" BorderThickness="2" Width="400" Height="300" Margin="10">
<StackPanel Orientation="Horizontal" Width="400" Height="300">
<Image Source="{Binding SourceImage}" Height="75" Width="75" Margin="0,-225,0,0" />
<Canvas Width="400">
<TextBlock Text="{Binding SourceName}" Foreground="Black" FontSize="25" TextWrapping="Wrap" Height="65" Width="326" d:LayoutOverrides="VerticalAlignment, Height" />
<ListBox Name="photoListbox" ItemsSource="{Binding Photo}" Height="229" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="326" Canvas.Top="69">
<Image Source="{Binding Big}" Height="200" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="400" />
</ListBox>
</Canvas>
</StackPanel>
</Border>
</DataTemplate>
</local:NewsTemplateSelector.Photos>
PhotoAttachment クラス:
public class PhotoAttachment : INotifyPropertyChanged
{
private string ownerId;
public string OwnerId { get { return ownerId; } set { ownerId = value; OnPropertyChanged("OwnerId"); } }
private string small;
public string Small { get { return small; } set { small = value; OnPropertyChanged("Small"); } }
private string big;
public string Big { get { return big; } set { big = value; OnPropertyChanged("Big"); } }
public PhotoAttachment(string ownId, string small, string big)
{
ownerId = ownId;
this.small = small;
this.big = big;
}
public PhotoAttachment() { }
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string info)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(info));
}
}
}