如何调试WPF中的绑定

我有一个VS2008, c# WPF, Excel插件;在某些情况下，My addin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

但是我找不到异常是从哪里来的。我知道这是b/c数据绑定。但找不到在哪里。每次我进入，VS跟踪到一个执行无错误的方法，然后在那之后，异常抛出，但不知道哪一行代码。

我已经为此挣扎了好几天了，一点进展也没有。请帮忙。由于

编辑，太长了，不适合注释。我把xaml文件放在这里。抛出异常的文件。抛出异常

<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:这里是堆栈跟踪

Name:NullReferenceException消息:Object reference not set to an对象的实例。目标:空白RestoreAttachedItemValue (System.Windows.DependencyObjectSystem.Windows.DependencyProperty)栈:atMicrosoft.Windows.Controls.DataGridRow.RestoreAttachedItemValue (DependencyObjectobjectWithProperty, DependencyProperty属性)Microsoft.Windows.Controls.DataGridRow.SyncProperties(布尔forcePrepareCells)Microsoft.Windows.Controls.DataGridRow。PrepareRow(对象,DataGrid(数据网格Microsoft.Windows.Controls.DataGrid.PrepareContainerForItemOverride (DependencyObject元素，对象项)System.Windows.Controls.ItemsControl.MS.Internal.Controls.IGeneratorHost.PrepareItemContainer (DependencyObject容器，对象项)System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer (DependencyObject容器)System.Windows.Controls.VirtualizingStackPanel.InsertContainer (Int32childIndex，元素容器，布尔值System.Windows.Controls.VirtualizingStackPanel.AddContainerFromGenerator (Int32childIndex，元素子元素，布尔值，新实现)System.Windows.Controls.VirtualizingStackPanel.BringIndexIntoView (Int32指数)Microsoft.Windows.Controls.DataGrid。ScrollRowIntoView项(对象)
在Microsoft.Windows.Controls.DataGrid。OnScrollIntoView arg(对象)
System.Windows.Threading.ExceptionWrapper.InternalRealCall(委托callback，对象参数，Int32 numArgs) atMS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(对象source, Delegate method, Object args, Int32 numArgs, DelegatecatchHandler)System.Windows.Threading.Dispatcher。WrappedInvoke(委托回调,对象args, Int32 numArgs，委托catchHandler) atSystem.Windows.Threading.DispatcherOperation.InvokeImpl ()System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(对象在System.Threading.ExecutionContext.runTryCode(对象用户数据)System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup (TryCode代码，清理代码，backoutCode，对象userData)System.Threading.ExecutionContext.RunInternal (ExecutionContextexecutionContext, ContextCallback，回调，对象状态)atSystem.Threading.ExecutionContext.Run (ExecutionContextexecutionContext, ContextCallback, callback，对象状态，布尔值ignoreSyncCtx)System.Threading.ExecutionContext.Run (ExecutionContextexecutionContext, ContextCallback，回调，对象状态)atSystem.Windows.Threading.DispatcherOperation.Invoke ()System.Windows.Threading.Dispatcher.ProcessQueue ()System.Windows.Threading.Dispatcher。windprochook (IntPtr hwnd, Int32IntPtr wParam, IntPtr lParam, Boolean&处理)MS.Win32.HwndWrapper。WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam，IntPtr参数，布尔&处理)MS.Win32.HwndSubclass。DispatcherCallbackOperation(对象0)System.Windows.Threading.ExceptionWrapper.InternalRealCall(委托callback，对象参数，Int32 numArgs) atMS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(对象source, Delegate method, Object args, Int32 numArgs, DelegatecatchHandler)System.Windows.Threading.Dispatcher。WrappedInvoke(委托回调,对象args, Int32 numArgs，委托catchHandler) atSystem.Windows.Threading.Dispatcher.InvokeImpl (DispatcherPriority优先级，超时时间，委托方法，对象参数，Int32win32 . hwndsubclass . numArgs)SubclassWndProc (IntPtr hwnd,Int32 msg, IntPtr wParam, IntPtr lParam) atMS.Win32.UnsafeNativeMethods.DispatchMessage (MSG&味精)System.Windows.Threading.Dispatcher.PushFrameImpl (DispatcherFrame框架)System.Windows.Threading.Dispatcher。PushFrame (DispatcherFrame帧)
在System.Windows.Window。ShowHelper(Object booleanBox)system . windows . windows . showdialog ()