将 RTF 内容从 MemoryStream 追加到 XamRichTextEditor 的最简单方法是什么

Question

我试图从标准system.windows.controls.richtextbox控件中合并RTF上下文，并将其附加到Xamrichtexteditor Control的当前RTF上下文的末尾。当前，我的以下代码是在第一行上抛出零引用异常，我尝试引用临时XamrichTexteditor的" ActivedOcumentView"，即使我在调用文档后会假设。负载应该初始化并用内容填充。我愿意从另一种方法来接触到这一点，似乎复制/粘贴的想法将是最简单的。

代码：

                byte[] byteSig = Encoding.ASCII.GetBytes(rtfContextText);
                using (MemoryStream ms = new MemoryStream(byteSig))
                {
                    XamRichTextEditor tmpRichTextBox = new XamRichTextEditor();
                    tmpRichTextBox.Document.Load(RtfSerializationProvider.Instance, ms); // put current email body into memory stream
                    tmpRichTextBox.ActiveDocumentView.Selection.SelectAll();    // select all content
                    tmpRichTextBox.ActiveDocumentView.Selection.Copy();         // copy content into Clipboard
                    txtTextEditor.ActiveDocumentView.Selection.Paste();         // append Clipboard content into main XamRichTextEditor control
                } 

Answer 1

我能够为自己的问题构建答案，但是我永远无法获得复制和粘贴的方法来为我充分工作进入另一个，但在结果中似乎忽略了线路破裂和嵌入式图像(。

我最终必须直接与2个RichTextbox Contexts的原始数据手动合作。为此，我位于目标上下文中的位置，我想插入另一个，从其他上下文中，我剥离了除最外部的分组以外的所有(以避免复制根节点(。然后，我使用此串联版本将目标RichTextbox的文档加载。(下面的示例代码适用于我遇到同一问题的任何人。希望最终可以帮助某人。(

 // get string encoded version of body
                using (MemoryStream ms = new MemoryStream())
                {
                    txtTextEditor.Document.Save(RtfSerializationProvider.Instance, ms);
                    ms.Seek(0, SeekOrigin.Begin);
                    using (StreamReader sr = new StreamReader(ms))
                    {
                        strRtfCurrBody = sr.ReadToEnd();
                    }
                }
// find end and then the beginning of second-to-last grouping
                strRtfSignature = strRtfSignature.Remove(strRtfSignature.LastIndexOf('}'));
                int intCheck = PibsEmailer.RtfFindStartpoint(strRtfSignature, strRtfSignature.LastIndexOf('}'));
                if (intCheck < 0)
                {
                    // this should never happen unless the content of the signature is not in valid RTF format
                    throw new Exception("AddSignature Failed. Sig="" + Session.CurrentUser.EmailSignature + "" , Body="" + strRtfCurrBody + ""  IntCheck=" + intCheck);
                }
                strRtfSignature = strRtfSignature.Substring(intCheck);
                strRtfCurrBody = strRtfCurrBody.Insert(PibsEmailer.RtfFindLastParEnd(strRtfCurrBody), strRtfSignature);
                byte[] byteFullContent = Encoding.ASCII.GetBytes(strRtfCurrBody);
                using (MemoryStream ms = new MemoryStream(byteFullContent))
                {
                    ms.Seek(0, SeekOrigin.Begin);
                    this.txtTextEditor.Selection.SelectAll();
                    this.txtTextEditor.Selection.Document.Load(RtfSerializationProvider.Instance, ms);
                }

并有助于促进处理RTF格式数据的处理，我编写了以下两个功能(在上面的代码中引用(：

public static int RtfFindLastParEnd(string source)
    {
        int intLastPar = source.LastIndexOf("par}");
        if (intLastPar > 0)
        {
            intLastPar += 4; // add offset of "par}"
        }
        return intLastPar;
    }
    public static int RtfFindStartpoint(string source, int indexOfClosingBrace)
    {
        string workingString = source;
        int nestCount = 0;
        int currIndex = indexOfClosingBrace;
        while (currIndex > 0)
        {
            if (source[currIndex] == '}')
                nestCount++;
            else if (source[currIndex] == '{')
                nestCount--;
            if (nestCount == 0)
            {
                return currIndex;
            }
            currIndex--;
        }
        return -1;
    }