前缀'xcdg'不映射到命名空间

Question

我最近开始使用Extended WPF Toolkit中的DataGridControl

<Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource SampleDataSource}}">
    <xcdg:DataGridControl ItemsSource="{Binding Orders}" SelectionMode="Single" >
        <xcdg:DataGridControl.View>
            <xcdg:TableflowView FixedColumnCount="1" UseDefaultHeadersFooters="True" ShowRowSelectorPane="False" VerticalGridLineBrush="Green" VerticalGridLineThickness="2" HorizontalGridLineBrush="Purple" HorizontalGridLineThickness="2">
                <xcdg:TableflowView.Theme>
                    <xcdg:ZuneNormalColorTheme/>
                </xcdg:TableflowView.Theme>
            </xcdg:TableflowView>
        </xcdg:DataGridControl.View>
        <xcdg:DataGridControl.Columns>
            <xcdg:Column FieldName="OrderID" IsMainColumn="True"/>
            <xcdg:Column FieldName="ExternalID" />
            <xcdg:Column FieldName="CustomerName" />
            <xcdg:Column FieldName="Date" />
            <xcdg:Column FieldName="Address" />
            <xcdg:Column FieldName="Items" Width="*" />
        </xcdg:DataGridControl.Columns>
    </xcdg:DataGridControl>
</Grid>

没关系,一切正常.然后我添加了风格.

<Style TargetType="{x:Type xcdg:DataGridControl}">
    <Setter Property="Background" Value="MediumOrchid"/>
</Style>

Style应用,一切都恢复正常.所以我接下来要做的就是CotrolTemplate使用Expression Blend 创建并将该模板添加到我的Style中.

<Style TargetType="{x:Type xcdg:DataGridControl}">
  <Setter Property="Background"
          Value="MediumOrchid" />
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type xcdg:DataGridControl}">
        <Grid>
          <Border BorderBrush="{TemplateBinding BorderBrush}"
                  BorderThickness="{TemplateBinding BorderThickness}"
                  Background="{TemplateBinding Background}">
            <AdornerDecorator x:Name="PART_DragDropAdornerDecorator">
              <xcdg:TableViewScrollViewer x:Name="PART_ScrollViewer"
                                          Padding="{TemplateBinding Padding}"
                                          RowSelectorPaneWidth="{Binding (xcdg:DataGridControl.DataGridContext).RowSelectorPaneWidth, RelativeSource={RelativeSource Self}}"
                                          ShowRowSelectorPane="{Binding (xcdg:DataGridControl.DataGridContext).ShowRowSelectorPane, RelativeSource={RelativeSource Self}}">
                <xcdg:TableflowViewItemsHost />
              </xcdg:TableViewScrollViewer>
            </AdornerDecorator>
          </Border>
          <Grid x:Name="connectionStateGrid"
                HorizontalAlignment="Right"
                Height="30"
                Margin="0,0,25,25"
                VerticalAlignment="Bottom"
                Width="30">
            <ContentPresenter x:Name="connectionStateLoadingContentPresenter"
                              ContentTemplate="{Binding (xcdg:DataGridControl.DataGridContext).ConnectionStateLoadingGlyph, RelativeSource={RelativeSource Self}}"
                              Content="{TemplateBinding ConnectionState}"
                              Visibility="Collapsed" />
            <ContentPresenter x:Name="connectionStateCommittingContentPresenter"
                              ContentTemplate="{Binding (xcdg:DataGridControl.DataGridContext).ConnectionStateCommittingGlyph, RelativeSource={RelativeSource Self}}"
                              Content="{TemplateBinding ConnectionState}"
                              Visibility="Collapsed" />
            <ContentPresenter x:Name="connectionStateErrorContentPresenter"
                              ContentTemplate="{Binding (xcdg:DataGridControl.DataGridContext).ConnectionStateErrorGlyph, RelativeSource={RelativeSource Self}}"
                              Content="{TemplateBinding ConnectionState}"
                              Visibility="Collapsed" />
          </Grid>
        </Grid>
        <ControlTemplate.Triggers>
          <DataTrigger Binding="{Binding (xcdg:DataGridControl.DataGridContext).IsConnectionStateGlyphEnabled, RelativeSource={RelativeSource Self}}"
                       Value="False">
            <Setter Property="Visibility"
                    TargetName="connectionStateGrid"
                    Value="Collapsed" />
          </DataTrigger>
          <DataTrigger Binding="{Binding (xcdg:DataGridControl.DataGridContext).DataGridControl.ConnectionState, RelativeSource={RelativeSource Self}}"
                       Value="Loading">
            <Setter Property="Visibility"
                    TargetName="connectionStateLoadingContentPresenter"
                    Value="Visible" />
            <Setter Property="Visibility"
                    TargetName="connectionStateErrorContentPresenter"
                    Value="Collapsed" />
            <Setter Property="Visibility"
                    TargetName="connectionStateCommittingContentPresenter"
                    Value="Collapsed" />
          </DataTrigger>
          <DataTrigger Binding="{Binding (xcdg:DataGridControl.DataGridContext).DataGridControl.ConnectionState, RelativeSource={RelativeSource Self}}"
                       Value="Committing">
            <Setter Property="Visibility"
                    TargetName="connectionStateLoadingContentPresenter"
                    Value="Collapsed" />
            <Setter Property="Visibility"
                    TargetName="connectionStateErrorContentPresenter"
                    Value="Collapsed" />
            <Setter Property="Visibility"
                    TargetName="connectionStateCommittingContentPresenter"
                    Value="Visible" />
          </DataTrigger>
          <DataTrigger Binding="{Binding (xcdg:DataGridControl.DataGridContext).DataGridControl.ConnectionState, RelativeSource={RelativeSource Self}}"
                       Value="Error">
            <Setter Property="Visibility"
                    TargetName="connectionStateLoadingContentPresenter"
                    Value="Collapsed" />
            <Setter Property="Visibility"
                    TargetName="connectionStateErrorContentPresenter"
                    Value="Visible" />
            <Setter Property="Visibility"
                    TargetName="connectionStateCommittingContentPresenter"
                    Value="Collapsed" />
          </DataTrigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

但现在整个ControlTemplate都有下划线,它说

前缀'xcdg'不映射到命名空间.

有

xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"

在我的资源字典和窗口中.此外,xaml设计器在'MainWindow.xaml'中抛出异常,其中放置了'DataGridControl'.它的

ArgumentException:'{DependencyProperty.UnsetValue}'不是Setter上'System.Windows.Controls.Control.Template'属性的有效值.

在运行时它工作正常.所有发生的事情后,我加入ControlTemplate到Style的DataGridControl.任何解释为什么会发生这种情况或如何避免这种情况将受到高度赞赏.

Answer 1

似乎这个问题在VS2017中仍然存在.使用绑定到带有命名空间的依赖项属性时引发异常.

我发现的解决方案是明确地将Path =添加到绑定中.

原始代码:

<DataTrigger Binding="{Binding (xcdg:DataGridControl.DataGridContext).IsConnectionStateGlyphEnabled, RelativeSource={RelativeSource Self}}" Value="False">

修改后的代码

<DataTrigger Binding="{Binding Path=(xcdg:DataGridControl.DataGridContext).IsConnectionStateGlyphEnabled, RelativeSource={RelativeSource Self}}" Value="False">

我在Heinrich Ulbricht博客中找到了解决方案