XML文件的读取、序列化和反序列化操作

    public class XmlHelper

    {

        //从xml中获取MsgType

        public static string XMLSelect(string XML)

        {

            XmlDocument xmldoc = new XmlDocument();

            xmldoc.LoadXml(XML);

            XmlNodeList Msgxnl = xmldoc.SelectNodes("xml/MsgType");

            XmlNodeList Eventxnl = xmldoc.SelectNodes("xml/Event");

            string MsgType = string.Empty;

            string Event = string.Empty;

            if (Msgxnl.Count != 0)//msgType不为空

            {

                MsgType = Msgxnl[0].InnerText.Trim();

                if (MsgType == "event")

                {

                    if (Eventxnl.Count != 0)//event不为空

                    {

                        Event = Eventxnl[0].InnerText.Trim();

                        if (Event == "unsubscribe" || Event == "subscribe" || Event == "LOCATION")

                        {

                            MsgType = Event;

                        }

                        else//eventKey存在

                        {

                            XmlNodeList xnlEventKey = xmldoc.SelectNodes("xml/EventKey");

                            if (xnlEventKey.Count != 0)

                            {

                                MsgType = xnlEventKey[0].InnerText.Trim();

                            }

                        }

                    }

                }

            }

            //else

            //{

            //    XmlNode xn = xmldoc.SelectSingleNode("UpdateInfo/MsgType");

            //    if (xn!=null)

            //    {

            //        MsgType = xn.InnerText.Trim();

            //    }

            //}

            return MsgType;

        }

        //对象反序列化

        public static T XmlDeserialize<T>(string xmlString)

        {

            T t = default(T);

            using (MemoryStream stream = new MemoryStream())

            {

                using (StreamWriter sw = new StreamWriter(stream, Encoding.UTF8))

                {

                    sw.Write(xmlString);

                    sw.Flush();

                    stream.Seek(0, SeekOrigin.Begin);

                    XmlSerializer serializer = new XmlSerializer(typeof(T));

                    try

                    {

                        t = ((T)serializer.Deserialize(stream));

                    }

                    catch (Exception ex)

                    {

                        throw ex;

                    }

                }

            }

            return t;

        }

        //自定义对象序列化成字符串

        public static string CustomXMLSerialize<T>(T obj, string XML)

        {

            StringBuilder stringBuilder = new StringBuilder();

            Type type = obj.GetType();//TextSendInfo

            object[] classAtts = obj.GetType().GetCustomAttributes(typeof(XmlRootAttribute), false);//返回自定义特性的数组，XmlRootAttribute

            if (classAtts.Length > 0)

            {

                string XmlRoot = ((XmlRootAttribute)classAtts[0]).ElementName;//xml

                stringBuilder.Append("<");

                stringBuilder.Append(XmlRoot);

                stringBuilder.Append(">");



                PropertyInfo[] propertyArr = obj.GetType().GetProperties();//5个属性元素

                if (propertyArr.Length > 0)

                {

                    foreach (var propertyInfo in propertyArr)

                    {

                        object value = propertyInfo.GetValue(obj, null);//根据propertyInfo属性从obj中获取值,"请先在授权页面申请授权，再使用该功能！"

                        object[] propertyAtts = propertyInfo.GetCustomAttributes(typeof(XmlElementAttribute), false);//XmlElementAttribute

                        if (propertyAtts.Length > 0)

                        {

                            string xmlElementName = ((XmlElementAttribute)propertyAtts[0]).ElementName;//content

                            stringBuilder.Append("<");

                            stringBuilder.Append(xmlElementName);

                            stringBuilder.Append(">");

                            if (xmlElementName == "CreateTime")

                            {

                                stringBuilder.Append(value);

                            }

                            else

                            {

                                stringBuilder.Append("<![CDATA[" + value + "]]>");

                            }

                            stringBuilder.Append("</");

                            stringBuilder.Append(xmlElementName);

                            stringBuilder.Append(">");

                        }

                    }

                }

                if (XML != string.Empty)

                {

                    stringBuilder.Append(XML);

                }

                stringBuilder.Append("</");

                stringBuilder.Append(XmlRoot);

                stringBuilder.Append(">");

            }

            return stringBuilder.ToString();

        }

    }