在TextBox上面创建字符串的第一个字母

Question

如何TextBox在WPF中将字符串的第一个字母输入到上部.我想在xaml中这样做.

<TextBox x:Name="txtName" CharacterCasing="Upper" 
         HorizontalAlignment="Left" Height="23" 
         Margin="300,151,0,0" TextWrapping="Wrap"
         VerticalAlignment="Top" Width="240"
         Text="{Binding Name}" Grid.ColumnSpan="2"
         TextChanged="txtName_TextChanged"/>

Answer 1

这是诀窍的风格:

      <TextBox>
            <TextBox.Style>
                <Style TargetType="TextBox">
                <Setter Property="CharacterCasing" Value="Lower"/>
                <Style.Triggers>
                        <DataTrigger Binding="{Binding Text.Length, RelativeSource={RelativeSource Self}}" Value="0">
                            <Setter Property="CharacterCasing" Value="Upper"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </TextBox.Style>
        </TextBox>