.NET 4.8 WPF MaterialDesign SmartHint显示黑边异常问题

我们在WPF项目中使用MaterialDesignThemes库已有一段时间，最近更新库后，应用了MaterialDesignOutlinedTextBox样式的TextBox控件出现了异常的黑色侧边栏问题。

问题复现的控件XAML代码 #

<TextBox
Grid.Row="1"
Style="{StaticResource MaterialDesignOutlinedTextBox}"
GotFocus="SizeTextBox_GotFocus" LostFocus="TextBox_LostFocus"
PreviewKeyDown="TextBox_PreviewKeyDown"
materialDesign:HintAssist.Hint="{x:Static p:Resources.Height}"
FontSize="25" Height="60" Padding="10" Margin="20"
materialDesign:TextFieldAssist.SuffixText="{Binding Unit, Converter={StaticResource UnitAbbreviation}}"
BorderBrush="{StaticResource PrimaryColorBrush}"
materialDesign:HintAssist.Background="{StaticResource ThirdColorBrush}"
materialDesign:ValidationAssist.Background="{StaticResource ThirdColorBrush}">

    <TextBox.Text>
        <Binding Path="SelectedParameter.Height" UpdateSourceTrigger="Explicit">
            <Binding.ValidationRules>
            <utility:NumericValidationRule/>
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>

已尝试的无效方案 #

• 修改materialDesign:HintAssist下的所有属性，未解决问题
• 自定义SmartHint样式：

  <TextBox.Resources>
      <Style TargetType="{x:Type materialDesign:SmartHint}">
          <Setter Property="Background" Value="red"/>
      </Style>
  </TextBox.Resources>
  

  仅能修改部分属性，边距、内边距等设置无效果，黑色侧边栏问题依然存在

有效修复方案 #

经确认该问题由库更新导致，通过设置materialDesign:HintAssist.HintPaddingBrush="Transparent"即可解决，修改后的TextBox代码如下：

<TextBox
Grid.Row="1"
Style="{StaticResource MaterialDesignOutlinedTextBox}"
GotFocus="SizeTextBox_GotFocus" LostFocus="TextBox_LostFocus"
PreviewKeyDown="TextBox_PreviewKeyDown"
materialDesign:HintAssist.Hint="{x:Static p:Resources.Height}"
FontSize="25" Height="60" Padding="10" Margin="20"
materialDesign:TextFieldAssist.SuffixText="{Binding Unit, Converter={StaticResource UnitAbbreviation}}"
BorderBrush="{StaticResource PrimaryColorBrush}"
materialDesign:HintAssist.Background="{StaticResource ThirdColorBrush}"
materialDesign:ValidationAssist.Background="{StaticResource ThirdColorBrush}"
materialDesign:HintAssist.HintPaddingBrush="Transparent"> <!-- 添加此行修复 -->

    <TextBox.Text>
        <Binding Path="SelectedParameter.Height" UpdateSourceTrigger="Explicit">
            <Binding.ValidationRules>
            <utility:NumericValidationRule/>
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>

内容的提问来源于stack exchange，提问作者Max