XML读写

实体类：

public class LogEntity
{
        private int id;

        public int Id
        {
            get { return id; }
            set { id = value; }
        }
        private string context;

        public string Context
        {
            get { return context; }
            set { context = value; }
        }



        private DateTime logTime;

        public DateTime LogTime
        {
            get { return logTime; }
            set { logTime = value; }
        }


    }

 

XMLFile1.xml

<?xml version="1.0" encoding="utf-8" ?>
<LogTable>

</LogTable>

 

XMLFile2.xml

<?xml version="1.0" encoding="utf-8" ?>
<NowId>0</NowId>

 

DAL：

public class LogDal
{
        public static string GetAppPath()
　　　{//此方法用反射获取当前应用程序路径
　　　　//System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]; ： 

　　　　获取当前执行的应用程序集
　　　　//System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0].FullyQualifiedName; 

　　　　获取当前执行的应用程序集的完整路径
　　　　string exePath = 

　　　　System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0].FullyQualifiedName;
　　　　//exePath = "\\Program Files\\XXXXMLApp\\XXXXMLApp.exe"
　　　　string path = 

　　　　exePath.Replace(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0].Name,"");
 　　　　//exePath = "\\Program Files\\XXXXMLApp\\"
　　　　return path;
　　　}
        public List<LogEntity> select()
        {
            List<LogEntity> logs = new List<LogEntity>();
            XmlDocument xdom = new XmlDocument();
            xdom.Load(GetAppPath()+"XMLFile1.xml");
            foreach (XmlNode logNode in xdom.DocumentElement.ChildNodes)
            {
                LogEntity log = new LogEntity();
                log.Context = logNode.ChildNodes[1].InnerText;
                log.Id = int.Parse(logNode.ChildNodes[0].InnerText);
                log.LogTime = DateTime.Parse(logNode.ChildNodes[2].InnerText);
                logs.Add(log);
            }
            return logs;
        }

        public LogEntity selectById(LogEntity logentity1)
        {
            List<LogEntity> logs = new List<LogEntity>();
            LogEntity logentity = logentity1;
            XmlDocument xdom = new XmlDocument();
            xdom.Load(GetAppPath() + "XMLFile1.xml");
            foreach (XmlNode logNode in xdom.DocumentElement.ChildNodes)
            {
                if (logNode.ChildNodes[0].InnerText == logentity.Id.ToString())
                {
                    logentity.Context = logNode.ChildNodes[1].InnerText;
                    logentity.LogTime = DateTime.Parse(logNode.ChildNodes[2].InnerText);
                    break;
                }
            }
            return logentity;
        }
        
        public void update(LogEntity log)
        {
            XmlDocument xdom = new XmlDocument();
            xdom.Load(GetAppPath() + "XMLFile1.xml");
            foreach (XmlNode logNode in xdom.DocumentElement.ChildNodes)
            {
                if (int.Parse(logNode.ChildNodes[0].InnerText) == log.Id)
                {
                    logNode.ChildNodes[1].InnerText = log.Context;
                    logNode.ChildNodes[2].InnerText = log.LogTime.ToString();
                    break;
                }
            }
            xdom.Save(GetAppPath() + "XMLFile1.xml");
        }
        public void insert(LogEntity log)
        {
            
            List<LogEntity> logs = new List<LogEntity>();
            XmlDocument xdom = new XmlDocument();
            xdom.Load(GetAppPath() + "XMLFile2.xml");
            int NowId = int.Parse(xdom.DocumentElement.InnerText)+1;
            xdom.DocumentElement.InnerText = NowId.ToString();
            xdom.Save(GetAppPath() + "XMLFile2.xml");
            xdom = new XmlDocument();
            xdom.Load(GetAppPath() + "XMLFile1.xml");
            XmlNode NewLogNode = xdom.CreateElement("Log");
            XmlNode IdNode = xdom.CreateElement("Id");
            IdNode.InnerText = NowId.ToString();
            XmlNode ContextNode = xdom.CreateElement("Context");
            ContextNode.InnerText = log.Context;
            XmlNode TimeNode = xdom.CreateElement("LogTime");
            TimeNode.InnerText = log.LogTime.ToString();
            NewLogNode.AppendChild(IdNode);
            NewLogNode.AppendChild(ContextNode);
            NewLogNode.AppendChild(TimeNode);
            xdom.DocumentElement.AppendChild(NewLogNode);
            xdom.Save(GetAppPath() + "XMLFile1.xml");
            log.Id = NowId;
        }
        public void delete(LogEntity log)
        {
            List<LogEntity> logs = new List<LogEntity>();
            XmlDocument xdom = new XmlDocument();
            xdom.Load(GetAppPath() + "XMLFile1.xml");
            foreach (XmlNode logNode in xdom.DocumentElement.ChildNodes)
            {
                if (logNode.ChildNodes[0].InnerText == log.Id.ToString())
                {
                    xdom.DocumentElement.RemoveChild(logNode);
                    break;
                }
            }
            xdom.Save(GetAppPath() + "XMLFile1.xml");
        }
}

 

写入后的XML：

<?xml version="1.0" encoding="utf-8" ?>
<LogTable>    
    <Log>
        <Id>1</Id>
        <Context>测试内容1</Context>
        <LogTime>08-10-13 23:04:10</LogTime>
    </Log>

    <Log>
        <Id>2</Id>
        <Context>测试内容2</Context>
        <LogTime>08-10-13 23:05:10</LogTime>
    </Log>

    <Log>
        <Id>3</Id>
        <Context>测试内容3</Context>
        <LogTime>08-10-13 23:06:10</LogTime>
    </Log>
</LogTable>