WPF中DataGrid单元格右侧边框无法移除的问题求助

以下是几个针对性的解决思路，按优先级尝试：

• 修改GridLinesVisibility属性
  你当前设置了GridLinesVisibility="All"，这个属性控制的是DataGrid全局的网格线，而非单元格边框。如果不需要竖网格线，直接将其改为Horizontal，即可消除所有竖线：

  <DataGrid ... GridLinesVisibility="Horizontal" ...>
  

• 单独隐藏最后一列的分隔线
  如果需要保留其他列的竖网格线，仅隐藏最后一列的额外边框，可以给最后一列的DataGridTemplateColumn设置SeparatorVisibility="Collapsed"：

  <DataGridTemplateColumn Header="Type" Width="*" IsReadOnly="True" 
                          HeaderStyle="{StaticResource FlattenRightHeader}" 
                          CellStyle="{StaticResource RightCell}"
                          SeparatorVisibility="Collapsed">
  

• 调整DataGrid默认模板解决对齐问题
  若上述方法仍有边框不对齐的情况，大概率是DataGrid默认模板内的ScrollViewer或布局元素导致的。可以替换自定义模板，确保内部内容与外边框严格对齐：

  <Style TargetType="{x:Type DataGrid}" x:Key="AlignedDataGridStyle">
      <Setter Property="Template">
          <Setter.Value>
              <ControlTemplate TargetType="{x:Type DataGrid}">
                  <Border BorderBrush="{TemplateBinding BorderBrush}" 
                          BorderThickness="{TemplateBinding BorderThickness}"
                          Background="{TemplateBinding Background}"
                          SnapsToDevicePixels="True">
                      <ScrollViewer x:Name="DG_ScrollViewer" Focusable="false">
                          <ScrollViewer.Template>
                              <ControlTemplate TargetType="{x:Type ScrollViewer}">
                                  <Grid>
                                      <Grid.ColumnDefinitions>
                                          <ColumnDefinition Width="Auto"/>
                                          <ColumnDefinition Width="*"/>
                                      </Grid.ColumnDefinitions>
                                      <Grid.RowDefinitions>
                                          <RowDefinition Height="Auto"/>
                                          <RowDefinition Height="*"/>
                                          <RowDefinition Height="Auto"/>
                                      </Grid.RowDefinitions>
                                      <DataGridColumnHeadersPresenter x:Name="PART_ColumnHeadersPresenter"
                                                                      Grid.Column="1"
                                                                      Visibility="{Binding HeadersVisibility, ConverterParameter={x:Static DataGridHeadersVisibility.Column}, Converter={x:Static DataGrid.HeadersVisibilityConverter}, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/>
                                      <ScrollContentPresenter x:Name="PART_ScrollContentPresenter"
                                                              Grid.Row="1"
                                                              Grid.Column="1"
                                                              CanContentScroll="{TemplateBinding CanContentScroll}"
                                                              SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                      <ScrollBar x:Name="PART_VerticalScrollBar"
                                                  Grid.Row="1"
                                                  Grid.Column="2"
                                                  Maximum="{TemplateBinding ScrollableHeight}"
                                                  Orientation="Vertical"
                                                  Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
                                                  Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
                                                  ViewportSize="{TemplateBinding ViewportHeight}"/>
                                      <ScrollBar x:Name="PART_HorizontalScrollBar"
                                                  Grid.Row="2"
                                                  Grid.Column="1"
                                                  Maximum="{TemplateBinding ScrollableWidth}"
                                                  Orientation="Horizontal"
                                                  Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
                                                  Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
                                                  ViewportSize="{TemplateBinding ViewportWidth}"/>
                                  </Grid>
                              </ControlTemplate>
                          </ScrollViewer.Template>
                          <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                      </ScrollViewer>
                  </Border>
              </ControlTemplate>
          </Setter.Value>
      </Setter>
  </Style>
  

  然后给你的DataGrid应用这个样式：

  <DataGrid ... Style="{StaticResource AlignedDataGridStyle}" ...>
  

• 消除ScrollViewer的额外边距
  如果横向滚动条不需要，可以设置HorizontalScrollBarVisibility="Disabled"；若必须保留滚动条，可给ScrollViewer设置Padding为0：

  <DataGrid ...>
      <DataGrid.Resources>
          <Style TargetType="{x:Type ScrollViewer}">
              <Setter Property="Padding" Value="0"/>
          </Style>
      </DataGrid.Resources>
      <!-- 列定义 -->
  </DataGrid>
  

内容的提问来源于stack exchange，提问作者MiralKong