Button虚线边框

<Window.Resources>

        <Style TargetType="Button">

            <Setter Property="Template">

                <Setter.Value>

                    <ControlTemplate>

                        <Grid>

                            <Border Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" BorderThickness="1">

                                <Border.BorderBrush>

                                    <!--MappingMode:1.Absolute，StartPoint和EndPoint的值是按照Border的实际大小进行坐标设置

                                    2.RelativeToBoundingBox,StartPoint和EndPoint的值按照0,0和0,1进行设置

                                    -->

                                    <LinearGradientBrush StartPoint="0,5" EndPoint="5,0" SpreadMethod="Repeat" MappingMode="Absolute">

                                        <GradientStop Color="Red" Offset="0" />

                                        <GradientStop Color="Transparent" Offset="0.5" />

                                        <GradientStop Color="Red" Offset="1" />

                                    </LinearGradientBrush>

                                </Border.BorderBrush>

                            </Border>

<!--此方法也能显示文字   <ContentPresenter Content="{TemplateBinding Content}" VerticalAlignment="Center" HorizontalAlignment="Center" />-->

                            <TextBlock Text="{TemplateBinding Content}" VerticalAlignment="Center" HorizontalAlignment="Center" />

                        </Grid>                        

                    </ControlTemplate>

                </Setter.Value>

            </Setter>

        </Style>

    </Window.Resources>

    <Grid Name="grdRoot">

        <Button Name="btnClick" Content="Click" Width="72" Height="24"  />                    

    </Grid>