文本框边框不显示 - WPF

Question

textbox顶部和底部border没有显示。

我已经提供了一种用于在主窗口的整个XAML代码。我曾尝试增加BorderThickness并更改了BorderBrush。这没有用。
XAML：

<Window x:Class="WpfApplication6.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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:local="clr-namespace:WpfApplication6" 
     mc:Ignorable="d" 
     Title="Activation Window" Height="300" Width="518.797"> 
    <Grid> 
     <TextBox x:Name="txtFirstDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="23,171,0,76" BorderThickness="1" BorderBrush="Black" /> 
     <TextBox x:Name="txtSecondDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="81,171,0,76"/> 
     <TextBox x:Name="txtThirdDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="138,171,0,76"/> 
     <TextBox x:Name="txtFourthDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="195,171,0,76"/> 
     <TextBox x:Name="txtFifthDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="252,171,0,76"/> 
     <Label x:Name="label" Content="Product key:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="23,142,0,0"/> 
     <TextBox x:Name="txtFirstDigit_Copy" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="274" Margin="23,111,0,136" /> 
     <Label x:Name="label_Copy" Content="Email:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="23,81,0,0"/> 
     <TextBox x:Name="txtFirstDigit_Copy1" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="130" Margin="23,55,0,192" /> 
     <Label x:Name="label_Copy1" Content="First Name:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="23,25,0,0"/> 
     <TextBox x:Name="txtFirstDigit_Copy2" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="130" Margin="167,55,0,192" /> 
     <Button x:Name="button" Content="Next" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="142,220,0,0"/> 
     <Button x:Name="button1" Content="Cancel" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="222,220,0,0" Click="button1_Click"/> 
     <TextBlock x:Name="textBlock" HorizontalAlignment="Left" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top" Margin="350,147,0,0"/> 

    </Grid> 
</Window> 

Answer 1

我想尝试这样的事：

<Grid> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="30"></RowDefinition> 
     <RowDefinition Height="30"></RowDefinition> 
     <RowDefinition Height="30"></RowDefinition> 
     <RowDefinition Height="30"></RowDefinition> 
     <RowDefinition Height="30"></RowDefinition> 
     <RowDefinition Height="30"></RowDefinition> 
     <RowDefinition Height="30"></RowDefinition> 
    </Grid.RowDefinitions> 

    <Label x:Name="label_Copy1" Grid.Row="0" Content="First Name:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="23,0,0,0" /> 

    <StackPanel Orientation="Horizontal" Grid.Row="1"> 
     <TextBox x:Name="txtFirstDigit_Copy1" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="130" Margin="23,0,0,0" /> 
     <TextBox x:Name="txtFirstDigit_Copy2" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="130" Margin="11.5,0,0,0" /> 
    </StackPanel> 

    <Label x:Name="label_Copy" Grid.Row="2" Content="Email:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="23,0,0,0" /> 

    <TextBox x:Name="txtFirstDigit_Copy" Grid.Row="3" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="270" Margin="23,0,0,0" /> 

    <Label x:Name="label" Grid.Row="4" Content="Product key:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="23,0,0,0" /> 

    <StackPanel Orientation="Horizontal" Grid.Row="5"> 
     <TextBox x:Name="txtFirstDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="23,0,0,0" BorderThickness="1" /> 
     <TextBox x:Name="txtSecondDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="11.5,0,0,0" /> 
     <TextBox x:Name="txtThirdDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="11.5,0,0,0" /> 
     <TextBox x:Name="txtFourthDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="11.5,0,0,0" /> 
     <TextBox x:Name="txtFifthDigit" HorizontalAlignment="Left" Height="22" TextWrapping="Wrap" VerticalAlignment="Center" Width="45" Margin="11.5,0,0,0" /> 
    </StackPanel> 

    <StackPanel Orientation="Horizontal" Grid.Row="6"> 
     <Button x:Name="button" Content="Next" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="132,0,0,0" /> 
     <Button x:Name="button1" Content="Cancel" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="11.5,0,0,0" /> 
    </StackPanel> 
</Grid>