Dotnet總結（4）--xml讀寫

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--- Dotnet總結（4）--xml讀寫 (http://www.webasp.net/article/18/17582.htm)

-- 作者：未知
-- 發佈日期： 2005-04-18

讀xml,
public static string ReadXMLConfig(string strFileName, string sKey)
       {
//           string strFileName = "Brand.exe.config";
           XmlDocument oXmlDocument = new XmlDocument();

           string strReturn="";
           try
           {
               oXmlDocument.Load(Application.StartupPath+"\\"+strFileName);
               XmlNodeList oXmlNodeList = oXmlDocument.DocumentElement.ChildNodes;
               foreach (XmlElement oXmlElement in oXmlNodeList)
               {
                   if (oXmlElement.Name.ToLower() == "appsettings")
                   {
                       XmlNodeList _node = oXmlElement.ChildNodes;
                       if (_node.Count > 0)
                       {
                           foreach (XmlElement _el in _node)
                           {
                               if (_el.Attributes["key"].InnerXml.ToLower() == sKey.ToLower())
                               {
                                   strReturn = _el.Attributes["value"].Value;
                                   break;
                               }
                           }
                       }
                   }
               }
           }
           catch (Exception exp)
           {
               if (sKey.ToLower() == "dsn")
               {
                   strReturn = "Connect Timeout=5;server=localhost;database=Brand;uid=sa;pwd=";
               }

               XmlTextWriter oXmlTextWriter = new XmlTextWriter(strFileName, new System.Text.UTF8Encoding());
               oXmlTextWriter.WriteStartDocument();
               oXmlTextWriter.WriteStartElement("configuration");
               oXmlTextWriter.WriteStartElement("appSettings");
               oXmlTextWriter.WriteStartElement("add");
               oXmlTextWriter.WriteAttributeString("key", sKey);
               oXmlTextWriter.WriteAttributeString("value", strReturn);
               oXmlTextWriter.WriteEndElement();
               oXmlTextWriter.WriteEndElement();
               oXmlTextWriter.WriteEndElement();
               oXmlTextWriter.WriteEndDocument();
               oXmlTextWriter.Close();
           }
           return strReturn;
       }

// 寫
        private string WriteWebConfig(string sKey, string sValue)
        {
            string strFileName = "Brand.exe.config";
            XmlDocument oXmlDocument = new XmlDocument();
            try
            {
                oXmlDocument.Load(strFileName);
                XmlNodeList oXmlNodeList = oXmlDocument.DocumentElement.ChildNodes;
                foreach (XmlElement oXmlElement in oXmlNodeList)
                {
                    if (oXmlElement.Name.ToLower() == "appsettings")
                    {
                        XmlNodeList _node = oXmlElement.ChildNodes;
                        if (_node.Count > 0)
                        {
                            foreach (XmlElement _el in _node)
                            {
                                if (_el.Attributes["key"].InnerXml.ToLower() == sKey)
                                {
                                    _el.Attributes["value"].Value = sValue;
                                    break;
                                }
                            }
                        }
                    }
                }
            }
            catch
            {
                return "";
            }
            oXmlDocument.Save(strFileName);
            return sValue;
        }

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