Линии сетки в WPF ListView

Реализуйте настраиваемый GridViewRowPresenter и нарисуйте вертикальные линии в методе ArrangeOverride.

    protected override Size ArrangeOverride(Size arrangeSize)
    {
        var size = base.ArrangeOverride(arrangeSize);
        var children = Children.ToList();
        EnsureLines(children.Count);
        for (var i = 0; i < _lines.Count; i++)
        {
            var child = children[i];
            var x = child.TransformToAncestor(this).Transform(new Point(child.ActualWidth, 0)).X + child.Margin.Right;
            var rect = new Rect(x, -Margin.Top, 1, size.Height + Margin.Top + Margin.Bottom);
            var line = _lines[i];
            line.Measure(rect.Size);
            line.Arrange(rect);
        }
        return size;
    }

Затем используйте это для шаблона ListViewItem.

        <ListView.ItemContainerStyle>
            <Style TargetType="{x:Type ListViewItem}">
                <Setter Property="Margin" Value="2,0,0,0"/>
                <Setter Property="Padding" Value="0,2"/>
                <Setter Property="BorderBrush" Value="LightGray"/>
                <Setter Property="BorderThickness" Value="0,0,0,1"/>
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ListViewItem}">
                            <Border BorderBrush="{TemplateBinding BorderBrush}" 
                                    BorderThickness="{TemplateBinding BorderThickness}" 
                                    Background="{TemplateBinding Background}">
                                <GridLines:GridViewRowPresenterWithGridLines 
                                    Columns="{TemplateBinding GridView.ColumnCollection}"
                                    Margin="{TemplateBinding Padding}" />
                            </Border>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
                <Style.Triggers>
                    <Trigger Property="IsSelected" Value="True">
                        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}"/>
                    </Trigger>
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                    </Trigger>
                </Style.Triggers>
            </Style>
        </ListView.ItemContainerStyle>

См. Подробности в моей записи блога