wpf richtextbox：“decor == TextDecorations.Strikethrough”上的错误答案

【问题标题】：wpf richtextbox: error on "decor == TextDecorations.Strikethrough"wpf richtextbox：“decor == TextDecorations.Strikethrough”上的错误
【发布时间】：2022-08-14 09:48:41
【问题描述】：

试图检测 RichTextbox 中的选定文本是下划线还是删除线。在函数调用上出现语法错误。不知道如何解决。

然而，我让它适用于粗体和斜体的情况。似乎 TextDecorations 在 .NET 库中不存在与粗体和斜体案例类似的方式？

<Window x:Class=\"WpfApp1.MainWindow\"
        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:WpfApp1\"
        mc:Ignorable=\"d\"
        Title=\"MainWindow\" Height=\"450\" Width=\"800\">
<Grid>
   <RichTextBox Name=\"RichTextBox1\"/>
</Grid>
</Window>

using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;
namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private bool SelectionIsStrikethrough()
        {
            var decor = RichTextBox1.Selection.GetPropertyValue(TextDecorationsProperty);
            var unset = DependencyProperty.UnsetValue;
            var SelectionIsStrike = decor != unset && (TextDecorations)decor == TextDecorations.Strikethrough;
            return SelectionIsStrike;
        }

        private bool SelectionIsUnderline()
        {
            var decor = RichTextBox1.Selection.GetPropertyValue(TextDecorationsProperty);
            var unset = DependencyProperty.UnsetValue;
            var SelectionIsStrike = decor != unset && (TextDecorations)decor == TextDecorations.Underline;
            return SelectionIsStrike;
        }
        
        private bool SelectionIsBold()
        {
            var weight = RichTextBox1.Selection.GetPropertyValue(FontWeightProperty);
            var unset = DependencyProperty.UnsetValue;
            var SelectionIsBold = weight != unset && (FontWeight)weight == FontWeights.Bold;
            return SelectionIsBold;
        }
        private bool SelectionIsItalic()
        {
            var style = RichTextBox1.Selection.GetPropertyValue(FontStyleProperty);
            var unset = DependencyProperty.UnsetValue;
            var SelectionIsItalic = style != unset && (FontStyle)style == FontStyles.Italic;
            return SelectionIsItalic;
        }
    }       
}

标签： c# wpf

【解决方案1】：

private bool SelectionIsUnderline()
{
var decor = mEdit.Selection.GetPropertyValue(Inline.TextDecorationsProperty);
var unset = DependencyProperty.UnsetValue;
var SelectionIsStrike = decor != unset && decor == TextDecorations.Underline;
return SelectionIsStrike;
}

private bool SelectionIsStrikethrough()
{
var decor = mEdit.Selection.GetPropertyValue(Inline.TextDecorationsProperty);
var unset = DependencyProperty.UnsetValue;
var SelectionIsStrike = decor != unset && decor == TextDecorations.Strikethrough;
return SelectionIsStrike;
}

【讨论】：