C# XML : System. InvalidOperationException

Question

我一直在通过一个项目学习 C# 的 XML，但是我一直收到 InvalidOperationException。我把代码放在下面

        XmlTextWriter writer = new XmlTextWriter(path, System.Text.Encoding.UTF8);
        writer.WriteStartDocument(true);
        writer.Formatting = Formatting.Indented;
        writer.Indentation = 4;

        writer.WriteStartElement("User Info");
            writer.WriteStartElement("Name");
                writer.WriteString(userName);
            writer.WriteEndElement();
            writer.WriteStartElement("Tutor Name");
                writer.WriteString(tutorName);
            writer.WriteEndElement();
        writer.WriteEndElement();

        writer.WriteStartElement("Course Data"); /*This is where the exception points to*/
            foreach (UserCourse c in courses)
            {
                String cn = c.Name;
                writer.WriteStartElement(cn);

                foreach (UserUnit u in c.Units)
                {
                    writer.WriteStartElement(u.Name.ToString());

                    foreach (UserObjective o in u.Objectives)
                    {
                        writer.WriteStartElement(o.Name.ToString());
                        writer.WriteString(o.Score.ToString());
                        writer.WriteEndElement();
                    }
                    writer.WriteEndElement();
                }
                writer.WriteEndElement();
            }
        writer.WriteEndElement();

        writer.WriteEndDocument();
        writer.Close();

也许有人能看出我做错了什么。感谢您的帮助!

Answer 1

XML 元素名称不能包含空格。

引用XML Naming Rules .

另外，您似乎应该有一个根元素。像 CourseData 应该在 UserInfo 里面。

结帐 Fiddle