我有一个VS2008，C＃WPF，Excel AddIn;在某些情况下，我的插件会抛出异常，如
A first chance exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll
A first chance exception of type 'System.NullReferenceException' occurred in PresentationFramework.dll
但我找不到异常的来源。我知道这是b / c数据绑定。但无法找出原因。每次我介入时，VS都会跟踪一个执行w / o错误的方法，然后抛出异常，但不知道哪行代码。
我这几天一直在苦苦挣扎，无法取得一些进展。 请帮忙。谢谢
编辑，评论太长了。所以我把xaml文件放在这里。抛出异常的@xmal文件。引发异常的是DataGridComboBoxColumn
<UserControl x:Class="View.BasketView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit" >
<UserControl.Resources>
<sharedC:FunctionToHiddenVisibility x:Key="enumSRToVis"/>
<sharedC:FunctionToHiddenVisibility x:Key="enumCSToVis"/>
<Style x:Key="DataGridRowStyle" TargetType="{x:Type dg:DataGridRow}">
<Style.Triggers>
<Trigger Property="AlternationIndex" Value="1" >
<Setter Property="Background" Value="Beige" />
</Trigger>
</Style.Triggers>
<Setter Property="AllowDrop" Value="True" />
<Setter Property="Margin" Value="0 2 0 2" />
</Style>
<Style x:Key="DataGridStyle" TargetType="{x:Type dg:DataGrid}">
<Setter Property="AlternationCount" Value="2" />
<Setter Property="RowStyle" Value="{StaticResource DataGridRowStyle}" />
</Style>
<Style TargetType="{x:Type MenuItem}">
<Style.Triggers>
<Trigger Property="MenuItem.IsHighlighted" Value="True" >
<Setter Property="BorderBrush" >
<Setter.Value>
<SolidColorBrush Color="Gray"></SolidColorBrush>
</Setter.Value>
</Setter>
<Setter Property="BorderThickness" Value="1"/>
</Trigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
<GroupBox>
<GroupBox.Header>
<TextBlock FontSize="14" FontFamily="Verdana" Text="{Binding Header,Mode=OneWay}"></TextBlock>
</GroupBox.Header>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="33"></RowDefinition>
<RowDefinition Height="*" ></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<Border Margin="2 2 2 0">
<Grid>
<Menu Background="Transparent">
<Menu.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Transparent" />
</Menu.Resources>
<MenuItem IsEnabled="{Binding IsItemSelected}" Click="EditClick" ToolTip="Edit Relation(s)" Background="Transparent">
<MenuItem.Header>
<Image Width="16" Height="16" Source="{Binding EditImageFilePath}"/>
</MenuItem.Header>
</MenuItem>
<MenuItem IsEnabled="{Binding IsItemSelected}" Click="DeleteClick" ToolTip="Delete Relation(s)" Background="Transparent">
<MenuItem.Header>
<Image Width="16" Height="16" Source="{Binding DeleteImageFilePath}"/>
</MenuItem.Header>
</MenuItem>
</Menu>
</Grid>
</Border>
<dg:DataGrid Grid.Row="1" x:Name="basketDG" Margin="5 0 5 0" Background="White"
AutoGenerateColumns="False"
Style="{StaticResource DataGridStyle}"
SelectionMode="Extended"
GridLinesVisibility="None"
HeadersVisibility="Column" RowDetailsVisibilityMode="VisibleWhenSelected"
ItemsSource="{Binding BasketItems, Mode=OneWay}" CanUserAddRows="False" CanUserDeleteRows="False"
SelectionUnit="FullRow" SelectedItem="{Binding SelectedRelComplete}"
VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled"
SelectionChanged="BasketDgSelectionChanged"
Drop="DataGridDrop"
DragEnter="DataGridDragEnter"
AllowDrop="True"
>
<!-- Column definition -->
<dg:DataGrid.Columns>
<dg:DataGridTextColumn IsReadOnly="True" Width="100" Header="Symbol" Binding="{Binding Name}" >
<dg:DataGridTextColumn.ElementStyle>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="TextWrapping" Value="Wrap" />
</Style>
</dg:DataGridTextColumn.ElementStyle>
</dg:DataGridTextColumn>
<dg:DataGridTextColumn IsReadOnly="True" Width="*" Header="Symbol Description" Binding="{Binding Desc}" >
<dg:DataGridTextColumn.ElementStyle>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="TextTrimming" Value="WordEllipsis" />
</Style>
</dg:DataGridTextColumn.ElementStyle>
</dg:DataGridTextColumn>
<dg:DataGridComboBoxColumn Width="200" Header="Column"
SelectedValueBinding="{Binding Path=RelParams.ColumnName, UpdateSourceTrigger=PropertyChanged}"
DisplayMemberPath="cName"
SelectedValuePath="cName">
<dg:DataGridComboBoxColumn.ElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding RelInfo.Columns}" />
</Style>
</dg:DataGridComboBoxColumn.ElementStyle>
<dg:DataGridComboBoxColumn.EditingElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding RelInfo.Columns}" />
</Style>
</dg:DataGridComboBoxColumn.EditingElementStyle>
</dg:DataGridComboBoxColumn>
</dg:DataGrid.Columns>
</dg:DataGrid>
<Grid Grid.Row="2" Margin="0 5 0 0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" ></ColumnDefinition>
<ColumnDefinition Width="Auto" ></ColumnDefinition>
<ColumnDefinition Width="5" ></ColumnDefinition>
<ColumnDefinition Width="Auto" ></ColumnDefinition>
</Grid.ColumnDefinitions>
<StackPanel HorizontalAlignment="Left" Orientation="Horizontal" Grid.Column="0">
<Button Name="BtnSR" Visibility="{Binding SelectedFunction, Converter={StaticResource enumSRToVis}}" IsEnabled="{Binding ItemsExist}" Margin="2" Click="ShowBasketSettings">Basket Settings</Button>
</StackPanel>
<StackPanel HorizontalAlignment="Left" Orientation="Horizontal" Grid.Column="0">
<Button Name="BtnCS" Visibility="{Binding SelectedFunction, Converter={StaticResource enumCSToVis}}" IsEnabled="{Binding OnlyOneFutureItemExist}" Margin="2" Click="ShowCreateCurve">Curve Settings</Button>
</StackPanel>
<StackPanel Grid.Column="1">
<Button Width="50" Name ="BtnClear" ToolTip="Clear Basket" Margin="2" IsEnabled="{Binding ItemsExist}"
Click="BtnClear_Click">Clear</Button>
</StackPanel>
<StackPanel HorizontalAlignment="Right" Orientation="Horizontal" Grid.Column="3">
<Button Visibility ="{Binding ElementName=BtnSR, Path=Visibility}"
ToolTip="Send Series Data to Table"
Name="SendToTable" Margin="2" Command="{Binding SendToTableCommand}"
CommandParameter="{Binding ElementName=SendToTable}">Send to Table</Button>
</StackPanel>
<StackPanel HorizontalAlignment="Right" Orientation="Horizontal" Grid.Column="3">
<Button Visibility="{Binding ElementName=BtnCS, Path=Visibility}"
Name="CreateCurveSurface" Margin="2"
ToolTip="Send Curve Surface to Table"
IsEnabled="{Binding OnlyOneFutureItemExist}"
Click="CreateCurveSurfaceClick"
>Send to Table</Button>
</StackPanel>
</Grid>
</Grid>
</GroupBox>
</UserControl>
编辑：这是堆栈跟踪
名称：NullReferenceException消息：未将对象引用设置为 对象的实例。目标：虚空 RestoreAttachedItemValue（System.Windows.DependencyObject， System.Windows.DependencyProperty）Stack：at Microsoft.Windows.Controls.DataGridRow.RestoreAttachedItemValue（DependencyObject的 objectWithProperty，DependencyProperty属性）at Microsoft.Windows.Controls.DataGridRow.SyncProperties（布尔 forcePrepareCells）at Microsoft.Windows.Controls.DataGridRow.PrepareRow（Object item， DataGrid owningDataGrid）at Microsoft.Windows.Controls.DataGrid.PrepareContainerForItemOverride（DependencyObject的 元素，对象项目） System.Windows.Controls.ItemsControl.MS.Internal.Controls.IGeneratorHost.PrepareItemContainer（DependencyObject的 容器，对象项目）at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer（DependencyObject的 容器） System.Windows.Controls.VirtualizingStackPanel.InsertContainer（的Int32 childIndex，UIElement容器，Boolean isRecycled）at System.Windows.Controls.VirtualizingStackPanel.AddContainerFromGenerator（的Int32 childIndex，UIElement child，BooleannewRealized）at System.Windows.Controls.VirtualizingStackPanel.BringIndexIntoView（的Int32 指数） Microsoft.Windows.Controls.DataGrid.ScrollRowIntoView（Object item）
中的System.Windows.Window.Show（）
在Microsoft.Windows.Controls.DataGrid.OnScrollIntoView（Object arg）
在System.Windows.Threading.ExceptionWrapper.InternalRealCall（Delegate 回调，对象args，Int32 numArgs）at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen（对象 source，Delegate方法，Object args，Int32 numArgs，Delegate catchHandler）at System.Windows.Threading.Dispatcher.WrappedInvoke（委托回调， 对象args，Int32 numArgs，Delegate catchHandler）at System.Windows.Threading.DispatcherOperation.InvokeImpl（）at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext（对象 在System.Threading.ExecutionContext.runTryCode（Object。） userData）at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup（TryCode 代码，CleanupCode backoutCode，Object userData）at System.Threading.ExecutionContext.RunInternal（执行上下文 executionContext，ContextCallback回调，对象状态）at System.Threading.ExecutionContext.Run（执行上下文 executionContext，ContextCallback回调，对象状态，布尔值 ignoreSyncCtx）at System.Threading.ExecutionContext.Run（执行上下文 executionContext，ContextCallback回调，对象状态）at System.Windows.Threading.DispatcherOperation.Invoke（）at System.Windows.Threading.Dispatcher.ProcessQueue（）at System.Windows.Threading.Dispatcher.WndProcHook（IntPtr hwnd，Int32 msg，IntPtr wParam，IntPtr lParam，Boolean＆amp;处理） MS.Win32.HwndWrapper.WndProc（IntPtr hwnd，Int32 msg，IntPtr wParam， IntPtr lParam，Boolean＆amp;处理） MS.Win32.HwndSubclass.DispatcherCallbackOperation（Object o）at System.Windows.Threading.ExceptionWrapper.InternalRealCall（代表 回调，对象args，Int32 numArgs）at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen（对象 source，Delegate方法，Object args，Int32 numArgs，Delegate catchHandler）at System.Windows.Threading.Dispatcher.WrappedInvoke（委托回调， 对象args，Int32 numArgs，Delegate catchHandler）at System.Windows.Threading.Dispatcher.InvokeImpl（的DispatcherPriority 优先级，TimeSpan超时，委托方法，对象args，Int32 numArgs）在MS.Win32.HwndSubclass.SubclassWndProc（IntPtr hwnd， Int32 msg，IntPtr wParam，IntPtr lParam）at MS.Win32.UnsafeNativeMethods.DispatchMessage（MSG＆amp; msg）at at System.Windows.Threading.Dispatcher.PushFrameImpl（DispatcherFrame 框架） System.Windows.Threading.Dispatcher.PushFrame（DispatcherFrame框架）
在System.Windows.Window.ShowHelper（Object booleanBox）at System.Windows.Window.ShowDialog（）
答案 0 :(得分：9)
我不确定您的问题的原因，但这里有一些关于如何调试WPF绑定的链接 -
如何调试WPF绑定？ http://www.zagstudio.com/blog/486 （WayBackLink）
在WPF或Silverlight应用程序中调试数据绑定 http://blogs.msdn.com/b/wpfsldesigner/archive/2010/06/30/debugging-data-bindings-in-a-wpf-or-silverlight-application.aspx （WayBackLink）
WPF代码段 - 检测绑定错误
http://www.switchonthecode.com/tutorials/wpf-snippet-detecting-binding-errors
（WayBackLink）
WPF中的调试数据绑定问题
http://www.wpftutorial.net/DebugDataBinding.html
答案 1 :(得分：8)
Wpf捕获绑定异常，因此它们通常不会触发调试器中断。您可以使用VS中的Debug \ Exceptions菜单命令让它们始终中断，单击查找，键入您看到的异常（例如System.InvalidOperationException）。单击“确定”，对话框应向下滚动到该异常。勾选“Thrown”列中的复选框，然后VS应该在调试时抛出原始异常的任何代码行。
这将捕获该类型的所有异常 - 甚至是你在Try Catch块中明确捕获的那些异常，所以记得在完成调试后取消该框，或者你最终想知道为什么VS会破坏正在进行的异常捕获。