学习笔记之 一个xml类

 class clsXML
    {
/*eig:
xml内容:
<?xml version="1.0" encoding="utf-8" ?>
<setting id="parent">
  <SP_Master  id="SP_Master"  tableName ="oders_Master " /> 
</setting>
调用方法:
string tableName = clsXML.getvalue("SP_Master", "tableName");
*/

        public static string getvalue(string _xmlPath, string _id, string _propertyName)
        {
            string rntValue = string.Empty;
            //这一部分路径处理的 ,可以不用管
            if (Path.IsPathRooted(_xmlPath) == false)
            {
                if (_xmlPath.Trim().Substring(0, 1) == ".")
                    _xmlPath = AppDomain.CurrentDomain.BaseDirectory + _xmlPath.Trim().Substring(1);
                else
                    _xmlPath = AppDomain.CurrentDomain.BaseDirectory + _xmlPath.Trim();
            }

            if (!File.Exists(_xmlPath))
            {
                return string.Empty;
            }
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(_xmlPath);
            XmlElement xmlnode = (XmlElement)xmlDoc.SelectSingleNode("//*[@id='" + _id.ToString().Trim() + "']");
            if (xmlnode != null)
            {
                rntValue = xmlnode.Attributes[_propertyName].Value;
                if (rntValue.Trim() == "")
                    rntValue = string.Empty;
            }
            return rntValue;
        }

        public static string getvalue(string _id, string _propertyName)
        {
            //通过工程属性设置的xml配置文件来得到相关配置项(windowsServicePart.Properties.Settings.Default.configFilePath)
            return clsXML.getvalue(windowsServicePart.Properties.Settings.Default.configFilePath, _id, _propertyName);
        }


/*eig:
xml内容:
<?xml version="1.0" encoding="utf-8" ?>
<setting id="parent">
  <connectstring  id="connectstring">Data Source=127.0.0.1 ;Initial Catalog=myDB;User ID=sa; Password=sa</connectstring>
</setting>
调用方法:
string connectString = clsXML.getvalue("connectstring")
*/
        public static string getvalue(string _id)
        {
            string rntValue = string.Empty;
            string _xmlPath = windowsServicePart.Properties.Settings.Default.configFilePath;
            if (Path.IsPathRooted(_xmlPath) == false)
            {
                if (_xmlPath.Trim().Substring(0, 1) == ".")
                    _xmlPath = AppDomain.CurrentDomain.BaseDirectory + _xmlPath.Trim().Substring(1);
                else
                    _xmlPath = AppDomain.CurrentDomain.BaseDirectory + _xmlPath.Trim();
            }

            if (!File.Exists(_xmlPath))
            {
                return string.Empty;
            }
            try
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(_xmlPath);
                XmlElement xmlnode = (XmlElement)xmlDoc.SelectSingleNode("//*[@id='" + _id.ToString().Trim() + "']");
                if (xmlnode != null)
                {
                    rntValue = xmlnode.InnerText;
                    if (rntValue.Trim() == "")
                        rntValue = string.Empty;
                }
            }
            catch 
            {
                return string.Empty;
            }

            return rntValue;
        }
    }