在C# WPF中可以更改为轮廓的文本框或文本字段

<Style TargetType="TextBox" x:Key="OutlinedTextBoxStyle">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="TextBox">
                <Grid>
                    <Border BorderThickness="2" BorderBrush="Black" Background="White">
                        <ScrollViewer x:Name="PART_ContentHost"/>
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<TextBox Style="{StaticResource OutlinedTextBoxStyle}" Width="200" Height="30"/>