ChatX/chatclient/MainWindow.xaml

<Window x:Class="chatclient.MainWindow"
        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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        xmlns:local="clr-namespace:chatclient"
        mc:Ignorable="d"
        Title="ChatWindow" Height="450" Width="800"
        Style="{StaticResource MaterialDesignWindow}">
    <Grid>
        <materialDesign:Card
 >
            <TabControl VerticalContentAlignment="Bottom" materialDesign:ColorZoneAssist.Mode="PrimaryMid" Style="{StaticResource MaterialDesignNavigationRailTabControl}">
                <TabItem>
                    <TabItem.Header>
                        <StackPanel Width="auto" Height="auto">
                            <materialDesign:PackIcon Width="24" Height="24" HorizontalAlignment="Center" Kind="Cog" />
                            <TextBlock HorizontalAlignment="Center" Text="All Files" />
                        </StackPanel>
                    </TabItem.Header>
                    <StackPanel>
                        <TextBlock Text="123"/>
                    </StackPanel>
                </TabItem>
                <TabItem>
                    <TabItem.Header>
                        <StackPanel Width="auto" Height="auto">
                            <materialDesign:PackIcon Width="24" Height="24" HorizontalAlignment="Center" Kind="Cog" />
                            <TextBlock HorizontalAlignment="Center" Text="设置" />
                        </StackPanel>
                    </TabItem.Header>
                    <StackPanel>
                        
                    </StackPanel>
                </TabItem>
            </TabControl>
        </materialDesign:Card>
    </Grid>
</Window>