WPF DataTemplate内重写BorderBrush,VisualBrush内数据源绑定提示绑定失败

定义DataTemplate 数据模板文件,内容如下

xml 复制代码
<DataTemplate x:Key="{DataTemplateKey {x:Type VM:TemplateListVM}}" DataType="{x:Type VM:TemplateListVM}">
<Grid Margin="0" Grid.Row="3" Height="50" VerticalAlignment="Top" Visibility="{Binding ShowNoMore, Converter={StaticResource BooleanToVisibilityConverter}}">
        <Grid.ColumnDefinitions>
          <ColumnDefinition Width="*" />
          <ColumnDefinition Width="auto" />
          <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
          <Border Grid.Column="0" Height="1" Margin="60,0,10,0" BorderThickness="1" Name="LeftBorder">
            <Border.BorderBrush>
              <VisualBrush>
                <VisualBrush.Visual>
                  <Rectangle StrokeDashArray="4 4" Stroke="Gray" StrokeThickness="1" 
                             Width="{Binding ElementName=LeftBorder, Path=ActualWidth}" 
                             Height="2" />
                </VisualBrush.Visual>
              </VisualBrush>
            </Border.BorderBrush>
          </Border>
          <TextBlock Grid.Column="1" VerticalAlignment="Center" Text="{x:Static loc:MainWindowLoc.NoMoreData}" Style="{StaticResource BodyStyleWhite}" Foreground="{StaticResource BorderGrayBrush}" />
          <Border Grid.Column="2" Height="1" Margin="10,0,60,0" BorderThickness="1">
            <Border.BorderBrush>
              <VisualBrush>
                <VisualBrush.Visual>
                  <Rectangle StrokeDashArray="4 4" Stroke="Gray" StrokeThickness="1" 
                             Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type Border}}, Path=ActualWidth}" 
                             Height="2" />
                </VisualBrush.Visual>
              </VisualBrush>
            </Border.BorderBrush>
          </Border>       
      </Grid>
</DataTemplate>

虽然显示效果没有问题,但程序运行时两个Width的绑定均会提示绑定失败:

ActualWidth Rectangle.Width Double 找不到源: RelativeSource FindAncestor, AncestorType='System.Windows.Controls.Border', AncestorLevel='1'

或者是找不到LeftBorder。

但如果直接写在userControl里面是没有任何提示的,研究了好久,发现在DataTemplate 需要这样写:

xml 复制代码
 <Grid Margin="0" Grid.Row="3" Height="50" VerticalAlignment="Top" Visibility="{Binding ShowNoMore, Converter={StaticResource BooleanToVisibilityConverter}}">
          <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="auto" />
            <ColumnDefinition Width="*" />
          </Grid.ColumnDefinitions>
          
          <Grid.Resources>
              <VisualBrush x:Key="leftBorderBrush">
                <VisualBrush.Visual>
                  <Rectangle StrokeDashArray="4 4" Stroke="Gray" StrokeThickness="1" Width="{Binding ElementName=LeftBorder, Path=ActualWidth}"  Height="2" />
                </VisualBrush.Visual>
              </VisualBrush>  
              <VisualBrush x:Key="RightBorderBrush">
                <VisualBrush.Visual>
                  <Rectangle StrokeDashArray="4 4" Stroke="Gray" StrokeThickness="1"  Width="{Binding ElementName=RightBorder , Path=ActualWidth}" Height="2" />
                </VisualBrush.Visual>
              </VisualBrush>            
          </Grid.Resources>
          
          <Border Grid.Column="0" Height="1" Margin="60,0,10,0" BorderThickness="1" Name="LeftBorder" BorderBrush="{StaticResource leftBorderBrush}" />
          <TextBlock Grid.Column="1" VerticalAlignment="Center" Text="{x:Static loc:MainWindowLoc.NoMoreData}" Style="{StaticResource BodyStyleWhite}" Foreground="{StaticResource BorderGrayBrush}" />
          <Border Grid.Column="2" Height="1" Margin="10,0,60,0" BorderThickness="1" Name="RightBorder"  BorderBrush="{StaticResource RightBorderBrush}"/>

        </Grid>           
	  </Grid>

刚使用wpf做正式项目,暂不清楚两种写法的区别。

相关推荐
小码编匠3 小时前
WPF 中的高级交互通过右键拖动实现图像灵活缩放
后端·c#·.net
唐青枫10 小时前
C#.NET 定时任务与队列利器:Hangfire 完整教程
c#·.net
hez201016 小时前
Runtime Async - 步入高性能异步时代
c#·.net·.net core·clr
mudtools1 天前
.NET驾驭Word之力:玩转文本与格式
c#·.net
唐青枫1 天前
C#.NET 数据库开发提速秘籍:SqlSugar 实战详解
c#·.net
mudtools2 天前
.NET驾驭Word之力:理解Word对象模型核心 (Application, Document, Range)
c#·.net
大飞pkz2 天前
【设计模式】C#反射实现抽象工厂模式
设计模式·c#·抽象工厂模式·c#反射·c#反射实现抽象工厂模式
唐青枫2 天前
从入门到进阶:C#.NET Stopwatch 计时与性能测量全攻略
c#·.net
未来之窗软件服务3 天前
幽冥大陆(二)RDIFSDK 接口文档:布草洗涤厂高效运营的技术桥梁C#—东方仙盟
开发语言·c#·rdif·仙盟创梦ide·东方仙盟
1uther3 天前
Unity核心概念⑨:Screen
开发语言·游戏·unity·c#·游戏引擎