はVirtualizingStackPanelを使用するときに「BindingExpressionパス・エラー」デバッグメッセージの負荷を取得することは正常ですか?ビジュアルアイテムがリサイクルされているので、ビジュアルアイテムがデータアイテムコレクションから一時的にバインドされていないために起こっていると思います...のItemsControlを使用して「BindingExpressionをパスエラー」とVirtualizingStackPanel
ItemsPanelのItemsPanelTemplateがVirtualizingStackPanelであるItemsControlがあります。私のViewModelのObservableCollection "Notes"にバインドします。
<ItemsControl x:Name="ListView" ItemsSource="{Binding Notes}"
ItemTemplate="{StaticResource ListDataTemplate}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer x:Name="ScrollViewer" Padding="{TemplateBinding Padding}">
<ItemsPresenter/>
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
</ItemsControl>
これは、DataContextがMainViewModel ViewModelに設定されているUserControl内にあります。
ListDataTemplate自体はノートのObservableCollection内の項目のプロパティにデータバインドいくつかのテキスト、含まれているボタン、含まれています
<DataTemplate x:Key="ListDataTemplate">
<Button>
<Grid>
<TextBlock TextWrapping="Wrap" Text="{Binding Title}">
</Grid>
</Button>
</DataTemplate>
私は私のプログラムを実行すると、すべてが正常に動作します - わずかに私のNotesコレクション内のアイテムの数は、いつでもバインドされています。私は上下にスクロールしかし私は、デバッグエラーの多くを得る:
System.Windows.Data Error: BindingExpression path error: 'Title' property not found on 'EnWp7.ViewModels.MainViewModel' 'EnWp7.ViewModels.MainViewModel' (HashCode=119211466). BindingExpression: Path='Title' DataItem='EnWp7.ViewModels.MainViewModel' (HashCode=119211466); target element is 'System.Windows.Controls.TextBlock' (Name=''); target property is 'Text' (type 'System.String')..
System.Windows.Data Error: BindingExpression path error: 'Title' property not found on 'EnWp7.ViewModels.MainViewModel' 'EnWp7.ViewModels.MainViewModel' (HashCode=119211466). BindingExpression: Path='Title' DataItem='EnWp7.ViewModels.MainViewModel' (HashCode=119211466); target element is 'System.Windows.Controls.TextBlock' (Name=''); target property is 'Text' (type 'System.String')..
System.Windows.Data Error: BindingExpression path error: 'Title' property not found on 'EnWp7.ViewModels.MainViewModel' 'EnWp7.ViewModels.MainViewModel' (HashCode=119211466). BindingExpression: Path='Title' DataItem='EnWp7.ViewModels.MainViewModel' (HashCode=119211466); target element is 'System.Windows.Controls.TextBlock' (Name=''); target property is 'Text' (type 'System.String')..
System.Windows.Data Error: BindingExpression path error: 'Title' property not found on 'EnWp7.ViewModels.MainViewModel' 'EnWp7.ViewModels.MainViewModel' (HashCode=119211466). BindingExpression: Path='Title' DataItem='EnWp7.ViewModels.MainViewModel' (HashCode=119211466); target element is 'System.Windows.Controls.TextBlock' (Name=''); target property is 'Text' (type 'System.String')..
それは(注プロパティがのItemsSourceある)メインビューモデルの「タイトル」プロパティを探している - 私が思うこれはノーマル - ビジュアルアイテムがNotesコレクションのアイテムからアンバインドされてコレクションの別のアイテムにリサイクルされるため、一時的な状況です。
他にもこれを見ましたか?それは正常ですか?
MainViewModelにダミーTitleプロパティを作成し、デバッグブレークポイントを設定すると、このスタックトレースが表示されます。 「UnlinkContainerFromItemを」注意:
...!EnWp7.ViewModels.MainViewModel.Title.get() Line 54 C#
mscorlib.dll!System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo rtmi = {System.Reflection.RuntimeMethodInfo}, object obj = {EnWp7.ViewModels.MainViewModel}, System.Reflection.BindingFlags invokeAttr = Default, System.Reflection.Binder binder = null, object parameters = null, System.Globalization.CultureInfo culture = null, bool isBinderDefault = false, System.Reflection.Assembly caller = null, bool verifyAccess = true, ref System.Threading.StackCrawlMark stackMark = LookForMyCaller)
mscorlib.dll!System.Reflection.RuntimeMethodInfo.InternalInvoke(object obj = {EnWp7.ViewModels.MainViewModel}, System.Reflection.BindingFlags invokeAttr = Default, System.Reflection.Binder binder = null, object[] parameters = null, System.Globalization.CultureInfo culture = null, ref System.Threading.StackCrawlMark stackMark = LookForMyCaller) + 0x14e bytes
mscorlib.dll!System.Reflection.RuntimePropertyInfo.InternalGetValue(System.Reflection.PropertyInfo thisProperty = {System.Reflection.RuntimePropertyInfo}, object obj = {EnWp7.ViewModels.MainViewModel}, object[] index = null, ref System.Threading.StackCrawlMark stackMark = LookForMyCaller) + 0x4e bytes
mscorlib.dll!System.Reflection.RuntimePropertyInfo.GetValue(object obj = {EnWp7.ViewModels.MainViewModel}, object[] index = null) + 0x2 bytes
System.Windows.dll!System.Windows.CLRPropertyListener.Value.get() + 0x1b bytes
System.Windows.dll!System.Windows.PropertyAccessPathStep.ConnectToPropertyInSource() + 0x148 bytes
System.Windows.dll!System.Windows.PropertyAccessPathStep.ConnectToProperty() + 0x16 bytes
System.Windows.dll!System.Windows.PropertyAccessPathStep.ReConnect(object newSource = {EnWp7.ViewModels.MainViewModel}) + 0x13 bytes
System.Windows.dll!System.Windows.PropertyPathListener.ReConnect(object source = {EnWp7.ViewModels.MainViewModel}) + 0x10 bytes
System.Windows.dll!System.Windows.Data.BindingExpression.SourceAquired() + 0x11 bytes
System.Windows.dll!System.Windows.Data.BindingExpression.DataContextChanged(object o = {System.Windows.Controls.TextBlock}, System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x26 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x15 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnAncestorDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x11 bytes
System.Windows.dll!System.Windows.FrameworkElement.NotifyDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x59 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnAncestorDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x18 bytes
System.Windows.dll!System.Windows.FrameworkElement.NotifyDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x59 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnAncestorDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x18 bytes
System.Windows.dll!System.Windows.FrameworkElement.NotifyDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x59 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnAncestorDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x18 bytes
System.Windows.dll!System.Windows.FrameworkElement.NotifyDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x59 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnAncestorDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x18 bytes
System.Windows.dll!System.Windows.FrameworkElement.NotifyDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x59 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnAncestorDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x18 bytes
System.Windows.dll!System.Windows.FrameworkElement.NotifyDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x59 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnAncestorDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x18 bytes
System.Windows.dll!System.Windows.FrameworkElement.NotifyDataContextChanged(System.Windows.DataContextChangedEventArgs e = {System.Windows.DataContextChangedEventArgs}) + 0x59 bytes
System.Windows.dll!System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyProperty dp = {System.Windows.CoreDependencyProperty}) + 0x1d bytes
System.Windows.dll!System.Windows.DependencyObject.RaisePropertyChangeNotifications(System.Windows.DependencyProperty dp = {System.Windows.CoreDependencyProperty}, object newValue = {EnWp7.ViewModels.MainViewModel}, object oldValue = {EnWp7.Store.NoteLocal}) + 0x38 bytes
System.Windows.dll!System.Windows.DependencyObject.ClearValueInternal(System.Windows.DependencyProperty dp = {System.Windows.CoreDependencyProperty}) + 0x138 bytes
System.Windows.dll!System.Windows.DependencyObject.ClearValue(System.Windows.DependencyProperty dp = {System.Windows.CoreDependencyProperty}) + 0x7 bytes
System.Windows.dll!System.Windows.Controls.ItemContainerGenerator.UnlinkContainerFromItem(System.Windows.DependencyObject container = {System.Windows.Controls.ContentPresenter}, object item = {EnWp7.Store.NoteLocal}, bool isRecycling = true) + 0x1f bytes
System.Windows.dll!System.Windows.Controls.ItemContainerGenerator.Remove(System.Windows.Controls.Primitives.GeneratorPosition position = {System.Windows.Controls.Primitives.GeneratorPosition}, int count = 2, bool isRecycling = true) + 0x14a bytes
System.Windows.dll!System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IRecyclingItemContainerGenerator.Recycle(System.Windows.Controls.Primitives.GeneratorPosition position = {System.Windows.Controls.Primitives.GeneratorPosition}, int count = 2) + 0x9 bytes
System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.CleanupRange(int startIndex = 0, int count = 2) + 0x20 bytes
System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.CleanupContainers(System.Windows.Controls.ItemsControl itemsControl = {System.Windows.Controls.ItemsControl}) + 0x73 bytes
System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.MeasureOverride(System.Windows.Size constraint = {System.Windows.Size}) + 0xe4 bytes
System.Windows.dll!System.Windows.FrameworkElement.MeasureOverride(System.IntPtr nativeTarget = 102509504, float inWidth = 480.0, float inHeight = 499.0, out float outWidth = 0.0, out float outHeight = 0.0) + 0x45 bytes
おかげで、 ダミアン
'VirtualizingStackPanel.VirtualizationMode =" Standard "'を使用するとバインディングエラーは消えますか? –
WP7で許可されているかどうか不明ですか? を設定した場合、ランタイムエラーが発生する(「VirtualizingStackPanel要素で不明な属性VirtualizationMode」) –
Damian
Windows Phoneを使用していることを明確にするために質問を更新しました。それ。 – Damian