从列表框的observablecollection中删除最后一项时出现预期的范围错误

Question

我有一个装满物品的SL4 ListBox。这是ItemContainerStyle：

  <Style x:Key="DataItemStyle"
     TargetType="ListBoxItem">
<Setter Property="Background"
        Value="Transparent" />
<Setter Property="TabNavigation"
        Value="Local" />
<Setter Property="HorizontalContentAlignment"
        Value="Center" />
<Setter Property="Template">
  <Setter.Value>
    <ControlTemplate TargetType="ListBoxItem">
      <Grid Background="{TemplateBinding Background}"
            LLamasoft:DragDropBehaviors.DragDropManager="{Binding ScratchPad.TableExplorer.DragDropManager, Source={StaticResource ViewModels}}"
            LLamasoft:DragDropBehaviors.DragSourceEffect="Copy">
        <ToolTipService.ToolTip>
          <c1:C1DataGrid ItemsSource="{Binding Preview}"
                         CanUserAddRows="False"
                         CanUserEditRows="False"
                         LLamasoft:DataGridBehaviors.FilterIdentityColumn="true" />
        </ToolTipService.ToolTip>
        <VisualStateManager.VisualStateGroups>
          <VisualStateGroup x:Name="CommonStates">
            <VisualState x:Name="Normal" />
            <VisualState x:Name="MouseOver">
              <Storyboard>
                <DoubleAnimation Duration="0"
                                 To=".35"
                                 Storyboard.TargetProperty="Opacity"
                                 Storyboard.TargetName="fillColor" />
              </Storyboard>
            </VisualState>
            <VisualState x:Name="Disabled">
              <Storyboard>
                <DoubleAnimation Duration="0"
                                 To=".55"
                                 Storyboard.TargetProperty="Opacity"
                                 Storyboard.TargetName="contentPresenter" />
              </Storyboard>
            </VisualState>
          </VisualStateGroup>
          <VisualStateGroup x:Name="SelectionStates">
            <VisualState x:Name="Unselected" />
            <VisualState x:Name="Selected">
              <Storyboard>
                <DoubleAnimation Duration="0"
                                 To=".75"
                                 Storyboard.TargetProperty="Opacity"
                                 Storyboard.TargetName="fillColor2" />
              </Storyboard>
            </VisualState>
          </VisualStateGroup>
          <VisualStateGroup x:Name="FocusStates">
            <VisualState x:Name="Focused">
              <Storyboard>
                <ObjectAnimationUsingKeyFrames Duration="0"
                                               Storyboard.TargetProperty="Visibility"
                                               Storyboard.TargetName="FocusVisualElement">
                  <DiscreteObjectKeyFrame KeyTime="0">
                    <DiscreteObjectKeyFrame.Value>
                      <Visibility>Visible</Visibility>
                    </DiscreteObjectKeyFrame.Value>
                  </DiscreteObjectKeyFrame>
                </ObjectAnimationUsingKeyFrames>
              </Storyboard>
            </VisualState>
            <VisualState x:Name="Unfocused" />
          </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
        <Rectangle x:Name="fillColor"
                   Fill="#FFBADDE9"
                   IsHitTestVisible="False"
                   Opacity="0"
                   RadiusY="1"
                   RadiusX="1" />
        <Rectangle x:Name="fillColor2"
                   Fill="#FFBADDE9"
                   IsHitTestVisible="False"
                   Opacity="0"
                   RadiusY="1"
                   RadiusX="1" />
        <Grid Margin="{TemplateBinding Padding}"
              HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}">
          <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition />
          </Grid.ColumnDefinitions>
          <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
          </Grid.RowDefinitions>
          <SaaS_icons:document_table Margin="4"
                                     Height="40"
                                     Grid.Column="1" />
          <ContentPresenter x:Name="contentPresenter"
                            ContentTemplate="{TemplateBinding ContentTemplate}"
                            Content="{Binding Name}"
                            Grid.Row="1"
                            Grid.ColumnSpan="3"
                            HorizontalAlignment="Center" />
        </Grid>
        <Rectangle x:Name="FocusVisualElement"
                   RadiusY="1"
                   RadiusX="1"
                   Stroke="#FF6DBDD1"
                   StrokeThickness="1"
                   Visibility="Collapsed" />
        <c1:C1ContextMenuService.ContextMenu>
          <c1:C1ContextMenu>
            <c1:C1MenuItem Header="Edit Info"
                           Command="{Binding ScratchPad.TableExplorer.EditInfoCommand, Source={StaticResource ViewModels}}"
                           CommandParameter="{TemplateBinding DataContext}" />
            <c1:C1MenuItem Header="Geocode"
                           Command="{Binding ScratchPad.TableExplorer.GeocodeTableCommand, Source={StaticResource ViewModels}}"
                           CommandParameter="{TemplateBinding DataContext}" />
            <c1:C1MenuItem Header="Delete"
                           Command="{Binding ScratchPad.TableExplorer.DeleteCommand, Source={StaticResource ViewModels}}"
                           CommandParameter="{TemplateBinding DataContext}" />
          </c1:C1ContextMenu>
        </c1:C1ContextMenuService.ContextMenu>
      </Grid>
    </ControlTemplate>
  </Setter.Value>
</Setter>

ItemsSource设置为VM中的ObservableCollection。如图所示，有一个上下文菜单选项可以从列表中删除项目。我可以整天添加和删除项目，没有任何问题，直到删除最后一项。然后我收到错误：

价值不在预期范围内

我看到大多数人称模板中的x：Name元素是一个问题，但我没有看到任何问题，当我只删除最后一个问题时，我感到非常困惑。谁能帮我吗？这就是调用堆栈中的所有内容：

System.Windows.dll!MS.Internal.Error.CallApplicationUEHandler(System.Exception e) + 0x4d bytes  
System.Windows.dll!MS.Internal.Error.CallAUEHandler(uint hr, out uint bIsHandled = 0) + 0x14 bytes  
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