替换RichTextBox文本但保持格式

Question

任何人都可以为我说明这一点,我有一个RichTextBox,我将xaml文件加载到其中.我需要用真实数据替换RichTxtBox文本的某些部分,即'[our_name]'替换为'Billie Brags'.我的xaml文件包含粗体和字体大小等格式.

当我运行我的代码(如下所示)时,我可以更改文本,但是我会丢失格式.

知道如何做到这一点并保持格式化吗？

谢谢

            FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
            using (fs)
            {
                TextRange RTBText = new TextRange(rtb_wording.Document.ContentStart, rtb_wording.Document.ContentEnd);
                RTBText.Load(fs, DataFormats.Xaml);
            }



        TextRange tr = new TextRange(rtb_wording.Document.ContentStart, rtb_wording.Document.ContentEnd);
        string rtbContent = tr.Text;
        rtbContent = rtbContent.Replace("<our_name>", "Billie Brags");
        System.Windows.MessageBox.Show(rtbContent);

        FlowDocument myFlowDoc = new FlowDocument();

        // Add paragraphs to the FlowDocument
        myFlowDoc.Blocks.Add(new Paragraph(new Run(rtbContent)));
        rtb_wording.Document = myFlowDoc;

Answer 1

它的工作原理,这就是我最终做到的,不是太漂亮但它的功能.WPF RTB真的应该有像winforms这样的rtf属性......

感谢肯特让我走上正轨.

            var textRange = new TextRange(rtb_wording.Document.ContentStart, rtb_wording.Document.ContentEnd);
            string rtf;
            using (var memoryStream = new MemoryStream())
            {
                textRange.Save(memoryStream, DataFormats.Rtf);
                rtf = ASCIIEncoding.Default.GetString(memoryStream.ToArray());
            }

            rtf = rtf.Replace("<our_name>", "Bob Cratchet");

            MemoryStream stream = new MemoryStream(ASCIIEncoding.Default.GetBytes(rtf));
            rtb_wording.SelectAll();
            rtb_wording.Selection.Load(stream, DataFormats.Rtf);