C# xml读写

class XmlClass
    {
        public string Pathname; //总列表
        public XmlClass()
        {
            string str = System.AppDomain.CurrentDomain.BaseDirectory;
            string path = str;
            
            for (int i = 0; i < 3; i++)
            {
                string rootpath = path.Substring(0, path.LastIndexOf("\"));
                path = rootpath;
            }
            Pathname = path + "\Document\myxml.xml";
        }

        public string[] XmlStore()
        {
            string []elements = new string[2];
            XmlReader reader = XmlReader.Create(Pathname);

            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element)  //如果是开始节点  
                {
                    switch (reader.Name)
                    {
                        case "Meet":                     
                            {
                                if (reader.Value == "")
                                    elements[0] = (string)reader.ReadElementContentAs(typeof(string), null);
                                                                    //适用父节点包含单个子元素，否则其余子元素无法获取
                                else
                                    elements[0] = reader.ReadContentAsString();
                            }break;
                            
                        case "Topic":
                            {
                                if (reader.Value == "")
                                    elements[1] = (string)reader.ReadElementContentAs(typeof(string), null);
                                else
                                    elements[1] = reader.ReadContentAsString();
                            }break;                           
                        default:
                            break;
                    }
                }
            }
            reader.Close();
            reader.Dispose();
            return elements;
        }

        public void XmlDisplay(string metting, string topic)
        {
            using (FileStream fs = new FileStream(Pathname, FileMode.Create, FileAccess.Write))
            {
                XmlWriter writer = XmlWriter.Create(fs);
                writer.WriteStartElement("Root");

                writer.WriteStartElement("Root1");
                writer.WriteElementString("Meet", metting);
                writer.WriteEndElement();

                writer.WriteStartElement("Root2");
                writer.WriteElementString("Topic", topic);
                writer.WriteEndElement();
                writer.WriteEndElement();
                writer.Close();
                writer.Dispose();
            }
        }
    }