如何在WPF中调试绑定

Question

如何在WPF中调试绑定

too*_*ive 21 c# debugging wpf excel add-in

我有一个VS2008,C#WPF,Excel AddIn; 在某些情况下,我的插件会抛出异常

A first chance exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll
A first chance exception of type 'System.NullReferenceException' occurred in PresentationFramework.dll

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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,它太长,不适合评论.所以我把xaml文件放在这里.抛出异常的@xmal文件.这是DataGridComboBoxColumn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>

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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)堆栈:在Microsoft.Windows.Controls.DataGridRow.RestoreAttachedItemValue(DependencyObject的objectWithProperty,DependencyProperty的财产)在Microsoft.Windows.Controls.DataGridRow.SyncProperties(布尔forcePrepareCells)在Microsoft.Windows.Controls.DataGridRow.PrepareRow(对象项,数据网格owningDataGrid)在Microsoft.Windows.Controls.DataGrid.PrepareContainerForItemOverride(DependencyObject的元件,对象项)在System.Windows.Controls.ItemsControl.MS.Internal.Controls.IGeneratorHost .PrepareItemContainer(DependencyObject的容器中,对象项)在System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject的容器)在System.Windows.Controls.VirtualizingStackPanel.InsertContainer(的Int32 childIndex,容器的UIElement, System.Windows.Controls.VirtualizingStackPanel上的Boolean isRecycled).AddContainerFromGenerator(的Int32 childIndex,孩子的UIElement,布尔newlyRealized)在System.Windows.Controls.VirtualizingStackPanel.BringIndexIntoView(的Int32指数)在Microsoft.Windows.Controls.DataGrid.ScrollRowIntoView(对象项)
在Microsoft.Windows.Controls.DataGrid.OnScrollIntoView (对象ARG)
在System.Windows.Threading.ExceptionWrapper.InternalRealCall(代表回调,对象指定参数时,的Int32 numArgs)在MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(对象源,委托方法,对象指定参数时,的Int32 numArgs,代表catchHandler)在System.Windows.Threading.Dispatcher.WrappedInvoke(代表回调,对象指定参数时,的Int32 numArgs,代表catchHandler)在System.Windows.Threading.DispatcherOperation.InvokeImpl()在System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(对象状态)在System.Rhtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup上的System.Threading.ExecutionContext.runTryCode(Object userData)(TryCode代码,CleanupCode)backoutCode,对象的UserData)在System.Threading.ExecutionContext.RunInternal(的ExecutionContext的ExecutionContext,ContextCallback回调,对象状态)在System.Threading.ExecutionContext.Run(的ExecutionContext的ExecutionContext,ContextCallback回调,在System.Threading.ExecutionContext对象状态,布尔ignoreSyncCtx) .RUN(的ExecutionContext的ExecutionContext,ContextCallback回调,对象状态)在System.Windows.Threading.DispatcherOperation.Invoke()在System.Windows.Threading.Dispatcher.ProcessQueue()在System.Windows.Threading.Dispatcher.WndProcHook(IntPtr的HWND, INT32味精,IntPtr的wParam中,IntPtr的lParam的,布尔逻辑处理)在MS.Win32.HwndWrapper.WndProc(IntPtr的HWND,INT32味精,IntPtr的wParam中,在MS.Win32.HwndSubclass.DispatcherCallbackOperation(对象O)在系统的IntPtr lParam的,布尔逻辑处理) .Windows.Threading.ExceptionWrapper.InternalRealCall(委托回调,Object args,Int32 numArgs)在MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source,Deleg 吃方法,对象指定参数时,的Int32 numArgs,代表catchHandler)在System.Windows.Threading.Dispatcher.WrappedInvoke(代表回调,对象指定参数时,的Int32 numArgs,代表catchHandler)在System.Windows.Threading.Dispatcher.InvokeImpl(的DispatcherPriority优先权,时间跨度超时,委托方法,对象在System.Windows.Threading程序指定参数时,的Int32 numArgs)在MS.Win32.HwndSubclass.SubclassWndProc(IntPtr的HWND,MSG的Int32,IntPtr的wParam中,IntPtr的LPARAM)在MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&MSG) .Dispatcher.PushFrameImpl(DispatcherFrame帧)在System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame帧)
在System.Windows.Window.ShowHelper(对象booleanBox)在System.Windows.Window.Show()在System.Windows.Window .ShowDialog()

Answer 1

akj*_*shi 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快报-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

Answer 2

fub*_*aar 7

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菜单命令让它们永远中断,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 - 甚至是您在Try Catch块中明确捕获的异常,因此请记住在完成调试时取消勾选该框,或者您最终会想知道VS为什么会破坏正在捕获的异常.

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