<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="窗体名称" Height="350" Width="525"
        WindowStyle="None" AllowsTransparency="True" Background="{x:Null}"
        WindowStartupLocation="CenterScreen"
        >
    <Grid>
        <Border Height="Auto">
            <Border.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FFD9E1EE" Offset="1"/>
                    <GradientStop Color="#FF3281C3" Offset="0"/>
                </LinearGradientBrush>
            </Border.Background>            
        </Border>
        <DockPanel LastChildFill="True">
            <DockPanel x:Name="Header" LastChildFill="True" Height="30" VerticalAlignment="Top" DockPanel.Dock="Top">
                <Button x:Name="ButtonClose" Style="{StaticResource btnCloseStyle}" Click="ButtonClose_Click" DockPanel.Dock="Right" Margin="0,0,8,0"/>
                <Button x:Name="ButtonMini" Style="{StaticResource btnMiniStyle}" Click="ButtonMini_Click" DockPanel.Dock="Right" Margin="0,0,10,0"></Button>
                <Image Source="logo.ico"  DockPanel.Dock="Left" Margin="5,2,5,0" Width="25" Height="25"/>
                <Label Foreground="White"  FontSize="14" FontFamily="Microsoft YaHei UI">WPF 窗体外观示例 V1.0</Label>
            </DockPanel>
        </DockPanel>
    </Grid>
</Window>

<Style x:Key="btnCloseStyle" TargetType="Button">
            <Setter Property="Width" Value="30"/>
            <Setter Property="Height" Value="30"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="PART_Border" CornerRadius="0" BorderBrush="Black" BorderThickness="0" Padding="2">
                            <Grid Width="12" Height="12">
                                <Path x:Name="PART_Path" Data="M6,6 L6,6 10,10 M10,6 L10,6 6,10" Fill="Gray" Stretch="Fill" Stroke="White" StrokeThickness="1"  VerticalAlignment="Center"/>
                            </Grid>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" TargetName="PART_Border" Value="Red">
                                </Setter>
                            </Trigger>
                            <Trigger Property="IsPressed" Value="True">
                                <Setter Property="Background" TargetName="PART_Border" Value="#FF2727BF"></Setter>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="btnMiniStyle" TargetType="Button">
            <Setter Property="Width" Value="30"/>
            <Setter Property="Height" Value="30"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="PART_Border" CornerRadius="0" BorderBrush="Black" BorderThickness="0" Padding="2">
                            <Path x:Name="PART_Path" Data="m 0,15 h12 " Fill="Gray" Stretch="None"  Stroke="White" StrokeThickness="1"  HorizontalAlignment="Center"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" TargetName="PART_Border" Value="#FF88B7E6">
                                </Setter>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.MouseLeftButtonDown += MainWindow_MouseLeftButtonDown;
        }
        void MainWindow_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (e.OriginalSource is Grid || e.OriginalSource is Border || e.OriginalSource is Window)
            {
                WindowInteropHelper win = new WindowInteropHelper(this);
                Win32.SendMessage(win.Handle, Win32.WM_NCLBUTTONDOWN, (int)Win32.HitTest.HTCAPTION, 0);
            }
        }
        private void ButtonClose_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void ButtonMini_Click(object sender, RoutedEventArgs e)
        {
            this.WindowState = System.Windows.WindowState.Minimized;
        }
    }

public class Win32
    {
        public const int WM_GETMINMAXINFO = 0x0024;
        public const int MONITOR_DEFAULTTONEAREST = 2;
        [DllImport("user32.dll")]
        public static extern IntPtr MonitorFromWindow(IntPtr hwnd, int dwFlags);
        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }
        [StructLayout(LayoutKind.Sequential)]
        public class MONITORINFOEX
        {
            public int cbSize;
            public RECT rcMonitor;
            public RECT rcWork;
            public int dwFlags;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 0x20)]
            public char[] szDevice;
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int x;
            public int y;
            public POINT(int x, int y)
            {
                this.x = x;
                this.y = y;
            }
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct MINMAXINFO
        {
            public POINT ptReserved;
            public POINT ptMaxSize;
            public POINT ptMaxPosition;
            public POINT ptMinTrackSize;
            public POINT ptMaxTrackSize;
        }

        [DllImport("user32.dll")]
        public static extern bool GetMonitorInfo(HandleRef hmonitor, [In, Out]MONITORINFOEX monitorInfo);

        public const int WM_NCHITTEST = 0x0084;
        public enum HitTest : int
        {
            HTERROR = -2,
            HTTRANSPARENT = -1,
            HTNOWHERE = 0,
            HTCLIENT = 1,
            HTCAPTION = 2,
            HTSYSMENU = 3,
            HTGROWBOX = 4,
            HTSIZE = 4,
            HTMENU = 5,
            HTHSCROLL = 6,
            HTVSCROLL = 7,
            HTMINBUTTON = 8,
            HTREDUCE = 8,
            HTMAXBUTTON = 9,
            HTZOOM = 9,
            HTLEFT = 10,
            HTRIGHT = 11,
            HTTOP = 12,
            HTTOPLEFT = 13,
            HTTOPRIGHT = 14,
            HTBOTTOM = 15,
            HTBOTTOMLEFT = 16,
            HTBOTTOMRIGHT = 17,
            HTBORDER = 18,
            HTCLOSE = 20,
            HTHELP = 21,
        }


        public const int WM_NCLBUTTONDOWN = 0x00A1;
        [DllImport("user32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
    }