Question

创建绑定列表的新实例

时，我的Windows Phone应用程序崩溃

BindedList更改：

OsyId = Response.recordedBills.Count > 50 ? new List<RecordedBillDetailViewModel>(Response.recordedBills.Take(50)) : new List<RecordedBillDetailViewModel>(Response.recordedBills);

多功能：

<toolkit:LongListMultiSelector ItemsSource="{Binding OsyId}" x:FieldModifier="public" x:Name="longList" EnforceIsSelectionEnabled="{Binding EnforceSelectionEnable}" Margin="0,0,10,0" SelectionChanged="LongListMultiSelector_SelectionChanged" IsSelectionEnabledChanged="LongListMultiSelector_IsSelectionEnabledChanged" MaxHeight="600" Grid.Row="1" HorizontalContentAlignment="Stretch">

崩溃报告：

   {System.ArgumentException: Value does not fall within the expected range.
   at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
   at MS.Internal.XcpImports.MethodPack(IntPtr objectPtr, String methodName, Object[] rawData)
   at MS.Internal.XcpImports.UIElement_TransformToVisual(UIElement element, UIElement visual)
   at System.Windows.UIElement.TransformToVisual(UIElement visual)
   at Microsoft.Phone.Controls.LongListMultiSelector.ApplyItemsState(State state, Boolean useTransitions)
   at Microsoft.Phone.Controls.LongListMultiSelector.OnIsSelectionEnabledChanged(DependencyPropertyChangedEventArgs e)
   at Microsoft.Phone.Controls.LongListMultiSelector.OnIsSelectionEnabledPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at Microsoft.Phone.Controls.LongListMultiSelector.set_IsSelectionEnabled(Boolean value)
   at Microsoft.Phone.Controls.LongListMultiSelector.UpdateIsSelectionEnabled()
   at Microsoft.Phone.Controls.LongListMultiSelector.OnSelectionChanged(IList removedItems, IList addedItems)
   at Microsoft.Phone.Controls.LongListMultiSelector.OnSelectedItemsCollectionCleared(Object sender, ClearedChangedArgs e)
   at Microsoft.Phone.Controls.LongListMultiSelector.SelectedItemsList.ClearItems()
   at System.Collections.ObjectModel.Collection1.Clear()
   at Microsoft.Phone.Controls.LongListMultiSelector.OnItemsSourceChanged(Object oldValue, Object newValue)
   at Microsoft.Phone.Controls.LongListMultiSelector.OnItemsSourcePropertyChanged(Object sender, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
   at System.Windows.DependencyObject.RefreshExpression(DependencyProperty dp)
   at System.Windows.Data.BindingExpression.SendDataToTarget()
   at System.Windows.Data.BindingExpression.SourcePropertyChanged(PropertyPathListener sender, PropertyPathChangedEventArgs args)
   at System.Windows.PropertyPathListener.RaisePropertyPathStepChanged(PropertyPathStep source)
   at System.Windows.PropertyAccessPathStep.RaisePropertyPathStepChanged(PropertyListener source)
   at System.Windows.CLRPropertyListener.SourcePropertyChanged(Object sender, PropertyChangedEventArgs args)
   at System.Windows.Data.WeakPropertyChangedListener.PropertyChangedCallback(Object sender, PropertyChangedEventArgs args)
   at System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e)
   at Windows8.Common.Helpers.NotifyPropertyChanged.OnPropertyChanged(String propertyName)
   at Windows8.Common.Helpers.NotifyPropertyChanged.SetProperty[T](T& storage, T value, String propertyName)
   at Windows8.Common.ViewModels.BillPaymentViewModel.set_OsyId(List`1 value)
   at Windows8.Common.ViewModels.BillPaymentViewModel.<InitiateBillRequestToRecordedBill>d__ee.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Windows8.Common.ViewModels.BillPaymentViewModel.<SetRecordedBillsAction>d__71.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Windows8.Common.ViewModels.CompanyMenu.<BillPaymentSubScreenAction>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Windows8.Common.Helpers.DelegateCommandAsync.<System.Windows.Input.ICommand.Execute>d__0.MoveNext()}

我该如何解决？

Answer 1

尝试清除项目并将其添加到列表中，而不是创建新实例。它可能有助于解决问题。这假设OsyId是ObservableCollection<RecordedBillDetailViewModel>

var itemsToAdd = Response.recordedBills.Take(50); // Take 50 is fine even when the response does not have 50 items. Need not add a contion for it.
OsyId.Clear();
foreach(var item in itemsToAdd)
    OsyId.Add(item)

谢谢， Shubhan

Answer 2

正如@Shubhan所说，它必须仅由ObservableCollection绑定，因为它使用INotifyCollectionChanged事件。列表正在使用IPropertyChangedEvent。 LongListSelector中有一个类似的事件：

xxxxx as INotifyCollectionChange;

它正在使用xxxx事件来重新绑定或调整事务大小。

感谢。

ReBind重新加载LongListMultiSelector时崩溃

2 个答案: