常规的无边框方法设计
常规的WPF无边框设计方法都是通过AllowsTransparency="True"和WindowStyle=“None”，并且使用WindowChrome样式来实现，但是这样会有问题就是，窗体最大化的时候将底部任务栏给挡住了，另外最大化的时候不能拖动窗体。参考这个大佬的设计@ 若汝棋茗 WPF制作无边框窗体、圆角窗体、支持改变大小、拖动分屏等（一）
但是感觉好麻烦啊。
比较完美的无边框设计
参照这个大佬的设计：梦机器工作室。保留了原改生的最小化、最大化、关闭、拖拽、伸缩窗体大小等操作。
可以看到在设计器内还是保留了默认的WindowStyle。
运行效果
资源字典
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApp1">
<Style x:Key="BorderlessButton" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" Background="{TemplateBinding Background}">
<Border x:Name="bg" Background="{StaticResource TransparentColor}" />
<Path x:Name="content"
Width="{TemplateBinding local:Icon.Width}"
Height="{TemplateBinding local:Icon.Height}"
Data="{TemplateBinding local:Icon.Geometry}"
Fill="{TemplateBinding Foreground}"
Stretch="Fill"
UseLayoutRounding="True" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="bg" Property="Background" Value="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, Path=(local:Mouse.OverBackColor)}" />
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter Property="Opacity" Value="0.8" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--#region 系统窗口-->
<Style x:Key="BorderlessWindowStyle" TargetType="{x:Type local:BorderlessWindow}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:BorderlessWindow}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
SnapsToDevicePixels="True">
<Grid Margin="{TemplateBinding Padding}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<AdornerDecorator x:Name="content" Grid.Row="1">
<ContentPresenter />
</AdornerDecorator>
<ResizeGrip x:Name="ResizeGrip"
Grid.Row="1"
Margin="0,0,5,5"
HorizontalAlignment="Right"
VerticalAlignment="Bottom"
IsTabStop="False"
Visibility="Collapsed"
WindowChrome.ResizeGripDirection="BottomRight" />
<Grid Background="{TemplateBinding CaptionBackground}">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<ContentPresenter Content="{TemplateBinding TitleContent}" />
<StackPanel Grid.Column="1" Orientation="Horizontal" WindowChrome.IsHitTestVisibleInChrome="True">
<!-- 最小化按钮 -->
<Button x:Name="ButtonMin"
Width="{TemplateBinding SystemButtonSize}"
Height="{TemplateBinding SystemButtonSize}"
local:Icon.Geometry="F1M0,6L0,9 9,9 9,6 0,6z"
local:Icon.Height="3"
local:Mouse.OverBackColor="{TemplateBinding SystemButtonOverColor}"
Background="{TemplateBinding SystemButtonColor}"
Command="SystemCommands.MinimizeWindowCommand"
Foreground="{TemplateBinding SystemButtonForeground}"
IsTabStop="False"
Style="{StaticResource BorderlessButton}" />
<!-- 最大化按钮 -->
<Button x:Name="ButtonMax"
Width="{TemplateBinding SystemButtonSize}"
Height="{TemplateBinding SystemButtonSize}"
local:Icon.Geometry="F1M0,0L0,9 9,9 9,0 0,0 0,3 8,3 8,8 1,8 1,3z"
local:Mouse.OverBackColor="{TemplateBinding SystemButtonOverColor}"
Background="{TemplateBinding SystemButtonColor}"
Command="SystemCommands.MaximizeWindowCommand"
Foreground="{TemplateBinding SystemButtonForeground}"
IsTabStop="False"
Style="{StaticResource BorderlessButton}" />
<!-- 恢复按钮 -->
<Button x:Name="ButtonRestore"
Width="{TemplateBinding SystemButtonSize}"
Height="{TemplateBinding SystemButtonSize}"
local:Icon.Geometry="F1M0,10L0,3 3,3 3,0 10,0 10,2 4,2 4,3 7,3 7,6 6,6 6,5 1,5 1,10z M1,10L7,10 7,7 10,7 10,2 9,2 9,6 6,6 6,9 1,9z"
local:Mouse.OverBackColor="{TemplateBinding SystemButtonOverColor}"
Background="{TemplateBinding SystemButtonColor}"
Command="SystemCommands.RestoreWindowCommand"
Foreground="{TemplateBinding SystemButtonForeground}"
IsTabStop="False"
Style="{StaticResource BorderlessButton}" />
<!-- 关闭窗口按钮 -->
<Button x:Name="ButtonClose"
Width="{TemplateBinding SystemButtonSize}"
Height="{TemplateBinding SystemButtonSize}"
local:Icon.Geometry="M453.44 512L161.472 220.032a41.408 41.408 0 0 1 58.56-58.56L512 453.44 803.968 161.472a41.408 41.408 0 0 1 58.56 58.56L570.56 512l291.968 291.968a41.408 41.408 0 0 1-58.56 58.56L512 570.56 220.032 862.528a41.408 41.408 0 0 1-58.56-58.56L453.44 512z"
local:Mouse.OverBackColor="{TemplateBinding SystemButtonCloseOverColor}"
Background="{TemplateBinding SystemButtonColor}"
Command="SystemCommands.CloseWindowCommand"
Foreground="{TemplateBinding SystemButtonForeground}"
IsTabStop="False"
Style="{StaticResource BorderlessButton}" />
</StackPanel>
</Grid>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="FitSystemWindow" Value="True">
<Setter TargetName="content" Property="Grid.Row" Value="0" />
<Setter TargetName="content" Property="Grid.RowSpan" Value="2" />
</Trigger>
<Trigger Property="WindowState" Value="Maximized">
<Setter Property="Padding" Value="8" />
<Setter TargetName="ButtonMax" Property="Visibility" Value="Collapsed" />
<Setter TargetName="ButtonRestore" Property="Visibility" Value="Visible" />
</Trigger>
<Trigger Property="WindowState" Value="Normal">
<Setter TargetName="ButtonMax" Property="Visibility" Value="Visible" />
<Setter TargetName="ButtonRestore" Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="ResizeMode" Value="NoResize">
<Setter TargetName="ButtonMin" Property="Visibility" Value="Collapsed" />
<Setter TargetName="ButtonMax" Property="Visibility" Value="Collapsed" />
<Setter TargetName="ButtonRestore" Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="ResizeMode" Value="CanMinimize">
<Setter TargetName="ButtonMax" Property="Visibility" Value=