WPF/XAML:如何在TextBlock中使所有文本大写？

Question

我希望TextBlock中的所有字符都以大写形式显示

 <TextBlock Name="tbAbc"
            FontSize="12"
            TextAlignment="Center"
            Text="Channel Name"
            Foreground="{DynamicResource {x:Static r:RibbonSkinResources.RibbonGroupLabelFontColorBrushKey}}" />

字符串通过Binding获取.我不想在字典本身中将字符串设为大写.

Answer 1

或者使用

Typography.Capitals="AllSmallCaps"

在你的TextBlock定义中.

请参阅此处:MSDN - Typography.Capitals

编辑:

这在Windows Phone 8.1中不起作用,仅适用于Windows 8.1 ...

Answer 2

实现自定义转换器.

using System.Globalization;
using System.Windows.Data;
// ...
public class StringToUpperConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value != null && value is string )
        {
            return ((string)value).ToUpper();
        }

        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return null;
    }
}

然后将其作为资源包含在您的XAML中:

<local:StringToUpperConverter  x:Key="StringToUpperConverter"/>

并将其添加到您的绑定:

Converter={StaticResource StringToUpperConverter}

Answer 3

您可以使用如下附加属性：

public static class TextBlock
{
    public static readonly DependencyProperty CharacterCasingProperty = DependencyProperty.RegisterAttached(
        "CharacterCasing",
        typeof(CharacterCasing),
        typeof(TextBlock),
        new FrameworkPropertyMetadata(
            CharacterCasing.Normal,
            FrameworkPropertyMetadataOptions.Inherits | FrameworkPropertyMetadataOptions.NotDataBindable,
            OnCharacterCasingChanged));

    private static readonly DependencyProperty TextProxyProperty = DependencyProperty.RegisterAttached(
        "TextProxy",
        typeof(string),
        typeof(TextBlock),
        new PropertyMetadata(default(string), OnTextProxyChanged));

    private static readonly PropertyPath TextPropertyPath = new PropertyPath("Text");


    public static void SetCharacterCasing(DependencyObject element, CharacterCasing value)
    {
        element.SetValue(CharacterCasingProperty, value);
    }

    public static CharacterCasing GetCharacterCasing(DependencyObject element)
    {
        return (CharacterCasing)element.GetValue(CharacterCasingProperty);
    }

    private static void OnCharacterCasingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is System.Windows.Controls.TextBlock textBlock)
        {
            if (BindingOperations.GetBinding(textBlock, TextProxyProperty) == null)
            {
                BindingOperations.SetBinding(
                    textBlock,
                    TextProxyProperty,
                    new Binding
                    {
                        Path = TextPropertyPath,
                        RelativeSource = RelativeSource.Self,
                        Mode = BindingMode.OneWay,
                    });
            }
        }
    }

    private static void OnTextProxyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        d.SetCurrentValue(System.Windows.Controls.TextBlock.TextProperty, Format((string)e.NewValue, GetCharacterCasing(d)));

        string Format(string text, CharacterCasing casing)
        {
            if (string.IsNullOrEmpty(text))
            {
                return text;
            }

            switch (casing)
            {
                case CharacterCasing.Normal:
                    return text;
                case CharacterCasing.Lower:
                    return text.ToLower();
                case CharacterCasing.Upper:
                    return text.ToUpper();
                default:
                    throw new ArgumentOutOfRangeException(nameof(casing), casing, null);
            }
        }
    }
}

然后，在xaml中的用法将如下所示：

<StackPanel>
    <TextBox x:Name="TextBox" Text="abc" />
    <TextBlock local:TextBlock.CharacterCasing="Upper" Text="abc" />
    <TextBlock local:TextBlock.CharacterCasing="Upper" Text="{Binding ElementName=TextBox, Path=Text}" />
    <Button local:TextBlock.CharacterCasing="Upper" Content="abc" />
    <Button local:TextBlock.CharacterCasing="Upper" Content="{Binding ElementName=TextBox, Path=Text}" />
</StackPanel>