路径未显示在wpf中

Question

我有一个ListBox，如：

<ListBox........>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal" Height="125" Width="250">
                <Path Data="M30.373745,48.782903 L34.061225,52.334534 31.195886,55.092382 34.153223,58.390248 30.240102,69.677123 26.208671,58.520078 29.50873,55.051745 26.683462,52.334534 z M45.929993,48.400234 C54.993983,50.039733 61.855001,57.69262 61.855001,66.890767 L61.855001,74.228456 0,74.228456 0,66.890767 C0,57.772108 6.741145,50.166745 15.688139,48.441349 L30.12067,70.215768 z M25.578545,16.688857 C23.65094,16.684204 21.220639,17.161782 20.935762,19.541124 20.935762,19.541124 C41.752938,28.634368 41.270957,24.164315 40.791351,22.315548 L40.470759,17.846459 C40.470759,17.846459 37.749578,15.688086 33.746217,17.537994 33.746217,17.537994 29.101681,17.382664 27.980984,16.920977 27.980984,16.920977 26.897432,16.692041 25.578545,16.688857 z M31.058608,7.9694567 C36.517556,7.9690171 40.31132,10.755741 40.31132,10.755741 47.356468,16.150166 43.51454,25.397617 43.51454,25.397617 45.114914,26.321945 44.955899,27.092082 44.955899,27.092082 44.955899,37.110899 42.073269,36.339536 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115.65763,55.094693 L108.4344,57.770352 C107.70384,58.041421 106.60199,57.871593 105.98716,57.393159 L99.9046,52.666692 C99.290227,52.188297 99.390153,51.589703 100.12753,51.335543 L106.85324,49.018828 C107.22285,48.89212 107.6906,48.867242 108.14659,48.929507 z M116.1849,64.313321 C115.92341,64.653389 115.58309,64.94123 115.22663,65.094721 L108.10545,68.161015 C107.39176,68.467501 106.06313,68.211203 106.12515,67.483853 L107.53189,60.218189 C107.59321,59.49177 108.24373,58.679514 108.97672,58.414146 L116.22178,55.785567 C116.95453,55.520553 117.48765,55.894865 117.40702,56.618542 L116.6701,63.218556 C116.62902,63.580956 116.44638,63.973252 116.1849,64.313321 z M97.413327,62.406376 C97.237591,62.012556 97.150618,61.587373 97.195072,61.225596 L98.083245,53.998148 C98.173009,53.274272 98.762534,53.056366 99.39653,53.514899 L105.65592,58.04004 C106.28943,58.497505 106.6957,59.45819 106.55825,60.173748 L105.20487,67.249664 C105.06723,67.964837 104.44764,68.164968 103.82667,67.694143 L98.16417,63.398968 C97.853566,63.16265 97.589065,62.800195 97.413327,62.406376 z M126.78569,63.810287 C127.22452,63.945806 127.6348,64.164732 127.91072,64.434719 L133.42292,69.828487 C133.9745,70.369279 133.79304,70.929568 133.01683,71.075206 L125.35508,72.514344 C124.58007,72.660342 123.52346,72.31391 123.00831,71.74491 L117.91059,66.122327 C117.39589,65.553439 117.61083,64.983629 118.38929,64.855303 L125.48945,63.68631 C125.87951,63.62266 126.34687,63.67477 126.78569,63.810287 z M131.7497,80.188338 C131.42516,80.478586 131.03278,80.704803 130.65053,80.796827 L123.01388,82.63516 C122.2487,82.818596 120.98461,82.350418 121.18705,81.648332 L123.98772,74.763734 C124.18929,74.062445 124.99014,73.373429 125.76644,73.233412 L133.44065,71.843943 C134.21664,71.704233 134.6712,72.157918 134.45107,72.853365 L132.44189,79.19566 C132.33096,79.543809 132.07424,79.898088 131.7497,80.188338 z M113.5575,75.252196 C113.46013,74.837836 113.45662,74.407275 113.57076,74.060288 L115.85124,67.128333 C116.08044,66.434185 116.70566,66.317188 117.24363,66.869834 L122.55527,72.324188 C123.09296,72.875708 123.30831,73.882835 123.03357,74.561043 L120.32248,81.268562 C120.04762,81.94636 119.39611,82.041039 118.87342,81.478486 L114.10739,76.346899 C113.8461,76.064715 113.65487,75.666556 113.5575,75.252196 z M101.91388,67.510834 C102.37301,67.50897 102.83501,67.595236 103.18925,67.770401 L110.26623,71.269876 C110.97477,71.621065 111.00358,72.210021 110.32818,72.581068 L103.66197,76.24510793.582501,82.38503 z M91.36911,16.709103 L83.027861,11.377728 L83.780329,14.795884 L63.271393,19.310696 L64.77633,26.147008 L85.285267,21.632196 L86.037735,25.050353 z M63.159544,51.366148 L68.646617,59.605811 L69.334764,56.174127 L89.924866,60.303012 L91.301161,53.439645 L70.711059,49.31076 L71.399207,45.879076 z"  VerticalAlignment="Center" 
                      Stretch="Uniform" Fill="{Binding Foreground, RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}}"
                      Width="68" Height="68" Margin="10" RenderTransformOrigin="0.5,0.5">
                    <Path.RenderTransform>
                        <TransformGroup>
                            <TransformGroup.Children>
                                <RotateTransform Angle="0" />
                                <ScaleTransform ScaleX="1" ScaleY="1" />
                            </TransformGroup.Children>
                        </TransformGroup>
                    </Path.RenderTransform>
                </Path>
                <TextBlock Text="{Binding Title, Converter={StaticResource spaceToNewLineConverter}}" VerticalAlignment="Top" 
                           Margin="40,10,10,10" FontSize="24" Foreground="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}}"/>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

以上代码完美无缺。

这是输出：

现在，如果我用下面的Binding替换path元素中的数据：

<Path Data="{Binding ImageData}" .........../>

它没有显示任何内容。这是输出：

但是其他图块显示具有上述绑定的图像。

在这里你可以看到：

我已将所有这些路径存储在数据库中。我确信我已经在数据库中存储了正确的购买路径值。此外，如果我在textBox上设置相同的绑定，那么它获取的值。但我在路径元素中看不到任何内容。此外，数据库中的字段为datatype = nvarchar(max)。所以，我的字符串没有被截断。对于其他路径，字符串长度接近约3000-5000但是对于此路径，字符串长度约为8000.因此，我认为WPF对路径或其他内容有一些字符串长度限制。

我正在寻找解决方案。

注意：我正在使用实体框架来生成我的模型。

更新

我在blend中为数据元素创建了上面的字符串。现在我将这些字符串比较如下：

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if (blend == database && database == runtime)
{
    MessageBox.Show("match found");
}

我收到一个消息框，说找到匹配。

Answer 1

ImageData中的哪种类型以及存储位置？我可以假设在这种情况下，对象ImageData必须是 Path 类型，然后才能引用它。在资源App.xaml，<Window.Resources>等中，使用密钥添加路径：

<Path x:Key="MyPath" Data="M30.373745,48.782903 L34.061225 ..." />

在Binding中，您必须指定Source并指定数据属性，如下所示：

<Path x:Name="MyPathButton"
      ...
      Fill="{StaticResource ButtonBackground}"                      // Your color
      Data="{Binding Source={StaticResource MyPath}, Path=Data}" /> // Your Path from resources

当通过Path这样的StaticResource表示字符串值时，这样：

<Window.Resources>
    <sys:String x:Key="MyPath">M30.373745,48.782903 ... </sys:String>
</Window.Resources>

<Path Name="MyPath"
      Data="{StaticResource MyPath}" />   

然后String不会转换为数据Path并发生异常。但是当通过Binding传递字符串时，内置的TypeConverter会自动将String转换为Path数据。