如何为WPF RichTextBox选区设置CultureInfo（语言）属性

Hey, I totally get how frustrating it is when you’ve spent days digging through solutions (usually SO saves the day, right?) but hit a wall with the same result every time. Let’s break this down step by step.

First, since you mentioned only adding a language-select ComboBox and its dropdown event (below your RichTextBox’s XAML), let’s start with the most common checkpoints:

• Validate your ComboBox event logic: Make sure when a language is selected, you’re actually applying that setting to the RichTextBox. For example, in WPF you’d need to explicitly update the Language property (and FlowDirection for right-to-left languages). Here’s a quick example of what that might look like:

  private void LanguageComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
  {
      var selectedItem = LanguageComboBox.SelectedItem as ComboBoxItem;
      if (selectedItem?.Tag == null) return;
  
      var langCode = selectedItem.Tag.ToString();
      // Apply language to RichTextBox
      richTextBox.Language = XmlLanguage.GetLanguage(langCode);
      // Adjust text direction for RTL languages like Arabic/Hebrew
      richTextBox.FlowDirection = langCode.StartsWith("ar") || langCode.StartsWith("he") 
          ? FlowDirection.RightToLeft 
          : FlowDirection.LeftToRight;
  }
  

• Check your RichTextBox XAML: You mentioned the XAML is <...>, but common pitfalls here include hardcoded text that won’t auto-translate, or missing dynamic bindings to localized resources. If your RichTextBox has static inline text, make sure it’s pulled from resource files (like Resources.resx for default, Resources.ar.resx for Arabic) instead of being written directly in XAML.

• Confirm culture settings are updated: Language switching often requires updating the current thread’s culture to load the correct resources. Add this to your ComboBox event handler if you haven’t already:

  var culture = new CultureInfo(langCode);
  Thread.CurrentThread.CurrentCulture = culture;
  Thread.CurrentThread.CurrentUICulture = culture;
  

If you can share the actual XAML code for your RichTextBox and the full ComboBox event handler, that would make it way easier to pinpoint exactly where things are stuck. Let me know what you find!

内容的提问来源于stack exchange，提问作者user3501495