C# 列表框选择产生无法设置不可变对象动画错误

我有一个WPF4应用程序。它包含2个列表框

第一个有可用匹配项的列表。选择匹配时，所选内容将用作显示匹配详细信息的详细信息网格的DataContext。此外，还会播放故事板，第二个列表框将显示可用市场

这一切都很好

问题是当从第二个列表框中选择市场时，应用程序崩溃，我得到：

无效操作异常为 未处理

无法在上设置“（0）。（1）”的动画 不可变对象实例

我不知道为什么会发生这种情况，因为Markets列表框不尝试播放任何动画。它会干扰比赛列表中的选择吗？？ 当在MarketsList中进行选择时，我尝试重置details datacontext，但没有成功

这是两个列表框的xaml

       <StackPanel x:Name="Connected" Grid.Column="1" Grid.Row="1" Visibility="Collapsed">
            <ListBox x:Name="ListBoxMatches" HorizontalAlignment="Left" VerticalAlignment="Center" ItemContainerStyle="{DynamicResource ListBoxItemContainerStyle1}" ItemTemplate="{DynamicResource MatchesDataTemplate}" SelectionChanged="ListBoxMatches_SelectionChanged" />
        </StackPanel>

        <Border x:Name="border1" BorderBrush="White" BorderThickness="1" Grid.Row="1" CornerRadius="20" Padding="15" Margin="-400,0,400,0">
            <StackPanel x:Name="Markets">
                <ListBox x:Name="ListBoxCurrentMarkets" SelectionChanged="ListBoxCurrentMarkets_SelectionChanged" />
            </StackPanel>
        </Border>

如果你需要更多的代码（比如故事板xaml），请告诉我

如果有人知道原因和发生了什么，请帮忙

谢谢

更新

我做了Daniel建议的更改，但肯定是做错了什么，因为它不起作用。 这是我设置项目源代码的地方：

 List<Market> TestList = new List<Market>();
                Market market = new Market { ID = 0, MarketName = "CorrectScore" };
                TestList.Add(market);
                market = new Market { ID = 1, MarketName = "Match Odds" };
                TestList.Add(market);                
                ListBoxCurrentMarkets.ItemsSource = TestList;    

请看一看，告诉我你的想法？我在valueconverter中设置了一个断点，它没有被命中。列表框中的项目也会显示，只有在进行选择时才会出现错误。 谢谢

更新

这是动画的xaml。动画将2个负边界移到正边界（即从屏幕外移到屏幕内）。有一个边框包含MatchDetails（文本块数据绑定到匹配项），有问题的边框包含available markets列表框

<Storyboard x:Key="MatchSelected">
            <ThicknessAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" Storyboard.TargetName="borderMatchData">
                <EasingThicknessKeyFrame KeyTime="0" Value="0,-400,0,400"/>
                <EasingThicknessKeyFrame KeyTime="0:0:1" Value="0"/>
            </ThicknessAnimationUsingKeyFrames>
            <ThicknessAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" Storyboard.TargetName="borderMarkets">
                <EasingThicknessKeyFrame KeyTime="0" Value="-400,0,400,0"/>
                <EasingThicknessKeyFrame KeyTime="0:0:1" Value="0"/>
            </ThicknessAnimationUsingKeyFrames>
        </Storyboard>

这是适用于BorderMArkets的xaml：

<Border x:Name="borderMarkets" BorderBrush="White" BorderThickness="1" Grid.Row="1" CornerRadius="20" Padding="15" Margin="-400,0,400,0">
            <StackPanel x:Name="Markets">
                <ListBox x:Name="ListBoxCurrentMarkets" SelectionChanged="ListBoxCurrentMarkets_SelectionChanged" ItemContainerStyle="{DynamicResource ListBoxItemContainerStyle1}">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <Grid>
                                <TextBlock x:Name="Market" Foreground="Black" TextWrapping="Wrap" Text="{Binding MarketName, Converter={StaticResource CloneConverter}}" />
                            </Grid>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </StackPanel>
        </Border>

更新

这就是造成所有问题的模板（我认为）

请参见

---

基本上，如果对数据绑定属性设置动画，就会发生这种情况。

这是因为它试图同时设置动画和绑定？如果我在动画之后应用ListBox项源，那会起作用吗？我不认为这会有帮助。您应该使用本文中介绍的解决方案，即指定一个IValueConverter，它返回任何freezable对象的克隆。示例中的

MyCloneConverter

类也应该可以正常工作。我不确定我做错了什么。我会发布我的更新代码。请看一下，断点肯定会触发。如果将

MyCloneConverter

作为资源添加到XAML（

）并引用此（

Converter={StaticResource cloneConverter}

），则会发生什么情况？当我这样做时，它将到达断点。当它达到“if（value是Freezable）”时，它将跳过它并返回原始值。是否需要检查值是否可自由释放？值是INPC类中的字符串。

public class MyCloneConverter : IValueConverter
    {
        public static MyCloneConverter Instance = new MyCloneConverter();

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is Freezable)
            {
                value = (value as Freezable).Clone();
            }

            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }

    }

<Storyboard x:Key="MatchSelected">
            <ThicknessAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" Storyboard.TargetName="borderMatchData">
                <EasingThicknessKeyFrame KeyTime="0" Value="0,-400,0,400"/>
                <EasingThicknessKeyFrame KeyTime="0:0:1" Value="0"/>
            </ThicknessAnimationUsingKeyFrames>
            <ThicknessAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" Storyboard.TargetName="borderMarkets">
                <EasingThicknessKeyFrame KeyTime="0" Value="-400,0,400,0"/>
                <EasingThicknessKeyFrame KeyTime="0:0:1" Value="0"/>
            </ThicknessAnimationUsingKeyFrames>
        </Storyboard>

MatchData.DataContext = selectedMatch;
                    Storyboard PlayMatch = (Storyboard)FindResource("MatchSelected");
                    BeginStoryboard(PlayMatch);

<Border x:Name="borderMarkets" BorderBrush="White" BorderThickness="1" Grid.Row="1" CornerRadius="20" Padding="15" Margin="-400,0,400,0">
            <StackPanel x:Name="Markets">
                <ListBox x:Name="ListBoxCurrentMarkets" SelectionChanged="ListBoxCurrentMarkets_SelectionChanged" ItemContainerStyle="{DynamicResource ListBoxItemContainerStyle1}">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <Grid>
                                <TextBlock x:Name="Market" Foreground="Black" TextWrapping="Wrap" Text="{Binding MarketName, Converter={StaticResource CloneConverter}}" />
                            </Grid>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </StackPanel>
        </Border>

<ControlTemplate x:Key="ListBoxItemControlTemplate1" TargetType="{x:Type ListBoxItem}">
        <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true" Background="#FF807F7F">
            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Normal"/>
                    <VisualState x:Name="MouseOver">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" Storyboard.TargetName="Bd">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF3D3B3B"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Disabled"/>
                </VisualStateGroup>
                <VisualStateGroup x:Name="SelectionStates">
                    <VisualState x:Name="Unselected"/>
                    <VisualState x:Name="Selected">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" Storyboard.TargetName="Bd">
                                <EasingColorKeyFrame KeyTime="0" Value="#FFA71616"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="SelectedUnfocused">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" Storyboard.TargetName="Bd">
                                <EasingColorKeyFrame KeyTime="0" Value="#FFA71616"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
                <VisualStateGroup x:Name="FocusStates">
                    <VisualState x:Name="Unfocused"/>
                    <VisualState x:Name="Focused">
                        <Storyboard>
                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" Storyboard.TargetName="Bd">
                                <EasingColorKeyFrame KeyTime="0" Value="#FF18E526"/>
                            </ColorAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
        </Border>
        <ControlTemplate.Triggers>
            <Trigger Property="IsSelected" Value="true">
                <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
            </Trigger>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="IsSelected" Value="true"/>
                    <Condition Property="Selector.IsSelectionActive" Value="false"/>
                </MultiTrigger.Conditions>
                <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            </MultiTrigger>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>