c# - 如何在 WPF RichTextBox 中突出显示数字

Question

我正在尝试将 WPF RichTextBox 中的所有数字重新着色为不同的颜色。我一直在关注this tutorial ，但我发现文本中的字母几乎是随机突出显示的。这是我目前拥有的处理程序:

private void DescriptionText_TextChanged(object sender, TextChangedEventArgs e)
{
    var range = new TextRange(DescriptionText.Document.ContentStart, DescriptionText.Document.ContentEnd);
    var regex = new Regex("[0-9]+");
    var num_ranges = new List<TextRange>();

    // add all the ranges with numbers
    foreach (Match match in num_reg.Matches(range.Text))
    {
        var start = range.Start.GetPositionAtOffset(match.Index);
        var end   = range.Start.GetPositionAtOffset(match.Index + match.Length);

        num_ranges.Add(new TextRange(start, end));
    }

    // unsuscribe before making changes
    DescriptionText.TextChanged -= this.DescriptionText_TextChanged;

    range.ClearAllProperties();
    range.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Black));

    foreach (var r in num_ranges)
    {
        r.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Red));
    }

    DescriptionText.TextChanged += this.DescriptionText_TextChanged;
}

Answer 1

试试这个

DescriptionText.TextChanged -= this.DescriptionText_TextChanged;
var regExp = new Regex(@"^-*[0-9,\.]+$");
foreach (Match match in regExp.Matches(rtb.Text))
    {
        var textRange = rtb.Selection;
        textRange.Select(match.Index, match.Length);
        textRange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Red));
        //rtb.SelectionColor = Color.Red;
    }
DescriptionText.TextChanged += this.DescriptionText_TextChanged;