前言
WPF中Window相信大家都很熟悉，有时我们有一些自定义需求默认Window是无法满足的，比如在标题栏上放一些自己东西，这个时候我们就需要写一个自己的Window，实现起来也很简单，只要给Window设置一个WindowChrome.WindowChrome附加属性就可以实现，WindowChrome 可以让你自定义窗口的非工作区的外观和行为。非工作区就是窗口的标题栏和边框，通常由操作系统绘制和管理。WindowChrome 可以让你将 WPF 的内容扩展到非工作区，同时保留一些系统的功能和行为，比如调整大小，移动，最大化，最小化等。

一、示例代码
1.1 基本使用

<local:CustomWindow
    x:Class="CustomWindowDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:CustomWindowDemo"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="Window1"
    Width="800"
    Height="450"
    Icon="/logo.png"
    mc:Ignorable="d">
    <Grid />
</local:CustomWindow>

 1.2 自定义标题栏高度

<local:CustomWindow
    x:Class="CustomWindowDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:CustomWindowDemo"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="Window1"
    Width="800"
    Height="450"
    CaptionHeight="35"
    Icon="/logo.png"
    mc:Ignorable="d">
    <Grid />
</local:CustomWindow>

1.3 自定义标题栏颜色

<local:CustomWindow
    x:Class="CustomWindowDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:CustomWindowDemo"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="Window1"
    Width="800"
    Height="450"
    CaptionBackground="Blue"
    Icon="/logo.png"
    mc:Ignorable="d">
    <Grid />
</local:CustomWindow>

1.4 自定义标题栏内容

<local:CustomWindow
    x:Class="CustomWindowDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:CustomWindowDemo"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="Window1"
    Width="800"
    Height="450"
    Icon="/logo.png"
    mc:Ignorable="d">
    <local:CustomWindow.CaptionBarContent>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>

            <Button
                Margin="5"
                Padding="2"
                VerticalAlignment="Center"
                Background="Transparent"
                BorderThickness="0"
                WindowChrome.IsHitTestVisibleInChrome="True">
                <StackPanel Orientation="Horizontal">
                    <Polygon
                        VerticalAlignment="Center"
                        Fill="White"
                        Points="0,6 6,0 6,12" />
                    <TextBlock
                        Margin="4,0,0,0"
                        VerticalAlignment="Center"
                        FontSize="14"
                        Foreground="White"
                        Text="返回" />
                </StackPanel>
            </Button>
            <TextBlock
                Grid.Column="1"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                FontSize="14"
                Foreground="White"
                Text="{Binding RelativeSource={RelativeSource AncestorType=Window}, Path=Title}" />
            <Button
                Grid.Column="2"
                Margin="5"
                Padding="2"
                VerticalAlignment="Center"
                Background="Transparent"
                BorderThickness="0"
                FontSize="14"
                Foreground="White"
                WindowChrome.IsHitTestVisibleInChrome="True">
                <StackPanel Orientation="Horizontal">
                    <TextBlock
                        Margin="0,0,4,0"
                        VerticalAlignment="Center"
                        Text="Admin" />
                    <Polyline
                        VerticalAlignment="Center"
                        Points="0,0 5,5 10,0"
                        Stroke="White"
                        StrokeThickness="2" />
                </StackPanel>
            </Button>
        </Grid>
    </local:CustomWindow.CaptionBarContent>
    <Grid />
</local:CustomWindow>

 二、综合案例