如何在CompositeWPF/Silverlight中删除区域中的所有视图

Question

我想在Composite中删除我所在区域的所有视图.我正在使用Silverlight 4.0.

不幸的是,此代码在Composite内部与OutOfRangeException崩溃.

        List<object> views = new List<object>(_regionManager.Regions["NavigationRegion"].Views);

        foreach (object view in views)
        {
            _regionManager.Regions["NavigationRegion"].Remove(view);
        }

这是我的callstack:

[外部代码]
Microsoft.Practices.Composite.Presentation!Microsoft.Practices.Composite.Presentation.Regions.ViewsCollection.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs E = {System.Collections.Specialized.NotifyCollectionChangedEventArgs})线102个+ 0X24字节C#
Microsoft.Practices.Composite.Presentation!Microsoft.Practices.Composite.Presentation.Regions.ViewsCollection.RemoveAndNotify(System.Collections.IList items = Count = 1)第45行+ 0x2b字节C#
Microsoft.Practices.Composite.Presentation!Microsoft. Practices.Composite.Presentation.Regions.ViewsCollection.UnderlyingCollection_CollectionChanged(对象发件人=计数= 0,System.Collections.Specialized.NotifyCollectionChangedEventArgs E = {System.Collections.Specialized.NotifyCollectionChangedEventArgs})线153 + 0XB字节C#[外部代码]
微软. Practices.Composite.Presentation!Microsoft.Practices.Composite.Presentation.Regions.Region.Remove(object view = {Kite.MyApp.SlUI.Navigation Region.NavigationRegionView})线230 + 0x1b字节C#
MyApp.SlUI!Kite.MyApp.SlUI.Components.ViewController.linksRegion_LanguageChanged(对象发件人= {Kite.MyApp.SlUI.Controls.LinksUserControl},Kite.MyApp.SlUI.Common. EventArgs e = {Kite.MyApp.SlUI.Common.EventArgs})第77行+ 0x2d字节C#
MyApp.SlUI!Kite.MyApp.SlUI.Controls.LinksUserControl.OnLanguageChanged(string newLanguage ="en-GB")第37行+ 0x32字节C#
MyApp.SlUI!Kite.MyApp.SlUI.Controls.LinksUserControl.ComboBox_SelectionChanged(对象发件人= {System.Windows.Controls.ComboBox},System.Windows.Controls.SelectionChangedEventArgs E = {System.Windows.Controls.SelectionChangedEventArgs})第31行+ 0xb字节C#[外部代码]

我错了什么？

PS在我所在的地区,我有3个观点.因此,复合体在删除第三个时崩溃了.

希望你帮忙:).谢谢.

UPD:我下载了调试符号,发现问题仅在Accordion控件中作为区域.这是完整的调用堆栈:

mscorlib.dll!System.ThrowHelper.ThrowArgumentOutOfRangeException(System.ExceptionArgument argument, System.ExceptionResource resource) + 0x41 bytes 
mscorlib.dll!System.ThrowHelper.ThrowArgumentOutOfRangeException() + 0x10 bytes 
mscorlib.dll!System.Collections.Generic.List<object>.this[int].get(int index = 0) + 0x13 bytes  
System.Windows.dll!System.Windows.Controls.ItemCollection.GetItemImpl(int index) + 0x15 bytes   
System.Windows.dll!System.Windows.Controls.ItemCollection.GetItemImplSkipMethodPack(int index) + 0xb bytes  
System.Windows.dll!System.Windows.PresentationFrameworkCollection<System.__Canon>.this[int].get(int index) + 0xb bytes  
System.Windows.Controls.Layout.Toolkit!System.Windows.Controls.Accordion.UnselectItem(int index = 0, object item = null) + 0x1aa bytes  
System.Windows.Controls.Layout.Toolkit!System.Windows.Controls.Accordion.ChangeSelectedIndex(int oldIndex = 0, int newIndex = -1) + 0x14c bytes 
System.Windows.Controls.Layout.Toolkit!System.Windows.Controls.Accordion.OnSelectedIndexPropertyChanged(System.Windows.DependencyObject d = {System.Windows.Controls.Accordion}, System.Windows.DependencyPropertyChangedEventArgs e = {System.Windows.DependencyPropertyChangedEventArgs}) + 0x1d9 bytes   
System.Windows.dll!System.Windows.DependencyObject.RaisePropertyChangeNotifications(System.Windows.DependencyProperty dp = {System.Windows.CustomDependencyProperty}, object oldValue, object newValue) + 0x51 bytes    
System.Windows.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.DependencyProperty property, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry, System.Windows.DependencyObject.ValueOperation operation) + 0xf5 bytes    
System.Windows.dll!System.Windows.DependencyObject.SetValueInternal(System.Windows.DependencyProperty dp, object value, bool allowReadOnlySet) + 0x2ad bytes    
System.Windows.dll!System.Windows.DependencyObject.SetValue(System.Windows.DependencyProperty dp, object value) + 0xb bytes 
System.Windows.Controls.Layout.Toolkit!System.Windows.Controls.Accordion.SelectedIndex.set(int value = -1) + 0x4d bytes 
System.Windows.Controls.Layout.Toolkit!System.Windows.Controls.Accordion.OnItemsChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e = {System.Collections.Specialized.NotifyCollectionChangedEventArgs}) + 0x737 bytes    
System.Windows.dll!System.Windows.Controls.ItemsControl.OnItemCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) + 0x52 bytes  
System.Windows.dll!System.Windows.Controls.ItemCollection.NotifyCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) + 0x37 bytes   
System.Windows.dll!System.Windows.Controls.ItemCollection.NotifyItemsCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) + 0x1f bytes  
System.Windows.dll!System.Windows.Controls.ItemCollection.EnumerableCollectionView.System.Windows.Controls.ICollectionChangedListener.OnCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) + 0x4f bytes    
System.Windows.dll!System.Windows.Controls.WeakCollectionChangedListener.SourceCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) + 0x3d bytes 
Microsoft.Practices.Composite.Presentation!Microsoft.Practices.Composite.Presentation.Regions.ViewsCollection.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e = {System.Collections.Specialized.NotifyCollectionChangedEventArgs}) Line 102 + 0x24 bytes  C#
Microsoft.Practices.Composite.Presentation!Microsoft.Practices.Composite.Presentation.Regions.ViewsCollection.RemoveAndNotify(System.Collections.IList items = Count = 1) Line 45 + 0x2b bytes  C#
Microsoft.Practices.Composite.Presentation!Microsoft.Practices.Composite.Presentation.Regions.ViewsCollection.UnderlyingCollection_CollectionChanged(object sender = Count = 0, System.Collections.Specialized.NotifyCollectionChangedEventArgs e = {System.Collections.Specialized.NotifyCollectionChangedEventArgs}) Line 153 + 0xb bytes C#
System.Windows.dll!System.Collections.ObjectModel.ObservableCollection<Microsoft.Practices.Composite.Presentation.Regions.ItemMetadata>.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) + 0x37 bytes 
System.Windows.dll!System.Collections.ObjectModel.ObservableCollection<System.__Canon>.RemoveItem(int index) + 0xa1 bytes   
mscorlib.dll!System.Collections.ObjectModel.Collection<Microsoft.Practices.Composite.Presentation.Regions.ItemMetadata>.Remove(Microsoft.Practices.Composite.Presentation.Regions.ItemMetadata item) + 0x75 bytes   
Microsoft.Practices.Composite.Presentation!Microsoft.Practices.Composite.Presentation.Regions.Region.Remove(object view = {Kite.MyApp.SlUI.NavigationRegion.NavigationRegionView}) Line 230 + 0x1b bytes    C#

Answer 1

首先检查_regionManager.Regions ["NavigationRegion"]是否确实存在,并且非如此

if (_regionManager.Regions["NavigationRegion"] != null)
{
        List<object> views = new List<object>(_regionManager.Regions["NavigationRegion"].Views);

        foreach (object view in views)
        {
            _regionManager.Regions["NavigationRegion"].Remove(view);
        }
}

可能是NavigationRegion没有正确设置,或者有拼写错误或类似的东西