How can I achieve a dashed or dotted border in WPF?

This worked great in our application, allowing us to use a real Border and not mess around with Rectangles:

<Border BorderThickness="1,0,1,1">
   <Border.BorderBrush>
      <DrawingBrush Viewport="0,0,8,8" ViewportUnits="Absolute" TileMode="Tile">
         <DrawingBrush.Drawing>
            <DrawingGroup>
               <GeometryDrawing Brush="Black">
                  <GeometryDrawing.Geometry>
                     <GeometryGroup>
                        <RectangleGeometry Rect="0,0,50,50" />
                        <RectangleGeometry Rect="50,50,50,50" />
                     </GeometryGroup>
                  </GeometryDrawing.Geometry>
               </GeometryDrawing>
            </DrawingGroup>
         </DrawingBrush.Drawing>
      </DrawingBrush>
   </Border.BorderBrush>

   <TextBlock Text="Content Goes Here!" Margin="5"/>
</Border>

Note that the Viewport determines the size of the dashes in the lines. In this case, it generates eight-pixel dashes. Viewport="0,0,4,4" would give you four-pixel dashes.

A bit late to the party, but the following solution worked for me. It is slightly simpler/better than both other solutions:

<Border BorderThickness="1">
  <Border.BorderBrush>
    <VisualBrush>
      <VisualBrush.Visual>
        <Rectangle StrokeDashArray="4 2" Stroke="Gray" StrokeThickness="1"
                  Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type Border}}, Path=ActualWidth}"
                  Height="{Binding RelativeSource={RelativeSource AncestorType={x:Type Border}}, Path=ActualHeight}"/>
      </VisualBrush.Visual>
    </VisualBrush>
  </Border.BorderBrush>

  <TextBlock Text="Whatever" />
</Border>

You can create a dotted or dashes line using a rectangle like in the code below

<Rectangle Stroke="#FF000000" Height="1" StrokeThickness="1" StrokeDashArray="4 4"
                                                       SnapsToDevicePixels="True"/>

Get started with this and customize your listview according to your scenario