C#写入XML

Question

我有一个将一些信息写入XML文件的应用程序，如下所示：

private void saveFileDialog1_FileOk(object sender, CancelEventArgs e)
{
    openedFilePath = saveFileDialog1.FileName;
    XmlWriterSettings set = new XmlWriterSettings();
    set.Indent = true;
    set.NewLineOnAttributes = true;
    using (XmlWriter writer = XmlWriter.Create(saveFileDialog1.FileName, set))
    {
        writer.WriteStartDocument();
        writer.WriteStartElement("Tree");
        writer.WriteStartElement("languages");
        foreach (TabPage page in textTC.TabPages)
        {
            writer.WriteStartElement("language");
            writer.WriteElementString("lan", page.Text);
            writer.WriteEndElement();
        }
        writer.WriteEndElement();
        writer.WriteStartElement("variables");
        foreach (Variable v in Form4.variables)
        {
            writer.WriteStartElement("variableOut");
            writer.WriteElementString("varName", v.varName);

            if (v.type == VariableType.BOOL)
                writer.WriteElementString("type", "bool");

            if (v.type == VariableType.INT)
                writer.WriteElementString("type", "int");

            writer.WriteElementString("value", v.value);
            writer.WriteEndElement();
        }
        writer.WriteEndElement();
        foreach (TabPage page in textTC.TabPages)
        {

            writer.WriteStartElement(page.Text);
            writer.WriteStartElement("phrases");

            for (int i = 0; i < dialogElements.Count; i++)
            {
                writer.WriteStartElement("phrase");
                writer.WriteElementString("ID", dialogElements[i].ID);
                writer.WriteElementString("indexInBranch", dialogElements[i].indexInBranch.ToString());
                writer.WriteElementString("characterName", dialogElements[i].characterName);
                writer.WriteElementString("text", dialogElements[i].dialogText);
                writer.WriteElementString("choiceText", dialogElements[i].choiceText);
                writer.WriteElementString("fileName", dialogElements[i].fileName);
                writer.WriteElementString("jumpTo", dialogElements[i].jumpTo.ToString());
                writer.WriteElementString("idToJump", dialogElements[i].idToJump);
                writer.WriteElementString("soundsFolder", soundsFolder);
                writer.WriteEndElement();
            }

            writer.WriteEndElement();

            writer.WriteStartElement("elements");

            for (int i = 0; i < Form5.operationsOfElements.Count; i++)
            {
                writer.WriteStartElement("element");
                writer.WriteElementString("ID", Form5.operationsOfElements[i].id);

                for (int j = 0; j < Form5.operationsOfElements[i].setElems.Count; j++)
                {
                    writer.WriteStartElement("SET");
                    writer.WriteElementString("variable", Form5.operationsOfElements[i].setElems[j].variable);
                    writer.WriteElementString("operation", Form5.operationsOfElements[i].setElems[j].operation);
                    writer.WriteElementString("value", Form5.operationsOfElements[i].setElems[j].value);
                    writer.WriteEndElement();
                }

                for (int j = 0; j < Form5.operationsOfElements[i].checkElems.Count; j++)
                {
                    writer.WriteStartElement("CHECK");
                    writer.WriteElementString("variable", Form5.operationsOfElements[i].checkElems[j].variable);
                    writer.WriteElementString("condition", Form5.operationsOfElements[i].checkElems[j].condition);
                    writer.WriteElementString("value", Form5.operationsOfElements[i].checkElems[j].value);
                    writer.WriteElementString("xmlFile", Form5.operationsOfElements[i].checkElems[j].xmlFile);
                    writer.WriteEndElement();
                }

                writer.WriteEndElement();
            }

            writer.WriteEndElement();
            writer.WriteEndElement();
            writer.WriteEndElement();
        }
        writer.WriteEndDocument();
    }
}

一开始它运行得很完美。但是，当我添加更多的元素时，它开始给我一个这样的错误：

“System.InvalidOperationException”类型的异常发生在System.Xml.dll中，但未在用户代码中处理 附加信息:在调用StartElement时写入EndRootElement将产生无效的EndRootElement文档。为了能够编写fragmentXML，ConformanceLevel应该具有ConformanceLevel.Fragment或ConformanceLevel.Auto的属性。

在这一行中引发异常: writer.WriteStartElement(page.Text)；

Answer 1

您错误地结束了每个loop..it内部的语言应该在循环之外

从第5行WriteEndElement()开始；在writer.WriteEndDocument()之前，将其从近距括号(第3行，向下)的外侧剪掉；

Answer 2

我想说的是，您的WriteEndElement呼叫数量不正确。如果您可以从异常中找到代码中的行，这将帮助您找到问题所在。

Answer 3

提供的方法示例中没有异常处理。添加try except并使用调试器查看异常在何处引发。