public class XmlFile{private string fileFolder;private string fileName;private string fPathBase = Directory.GetCurrentDirectory();  //结尾没有反斜杠public TimeConfig(string aFileFolder = "xmlConfig", string aFileName = "config"){fileFolder = aFileFolder;fileName = aFileName;}/// <summary>/// 创建xml文件/// </summary>/// <param name="aRoot"></param>/// <param name="aKey"></param>/// <param name="aValue"></param>public void CreateXmlFile(string aRoot, string aKey = "", string aValue = ""){XmlDocument xmlDoc = new XmlDocument();//创建类型声明节点  XmlNode node = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", "");xmlDoc.AppendChild(node);//创建根节点  XmlNode root = xmlDoc.CreateElement(aRoot);xmlDoc.AppendChild(root);if (!string.IsNullOrEmpty(aKey) && !string.IsNullOrEmpty(aValue)){CreateNode(aKey, aValue, xmlDoc, root);}xmlDoc.Save($"{fPathBase}//{fileFolder}//{fileName}.xml");}/// <summary>    /// 创建节点    /// </summary>    /// <param name="xmldoc"></param>  xml文档  /// <param name="parentnode"></param>父节点    /// <param name="name"></param>  节点名  /// <param name="value"></param>  节点值  ///   public void CreateNode(string name, string value, XmlDocument xmlDoc, XmlNode parentNode){XmlNode node = xmlDoc.CreateNode(XmlNodeType.Element, name, null);node.InnerText = value;parentNode.AppendChild(node);}/// <summary>/// 读取xml中某个节点的值/// </summary>/// <param name="aRoot"></param>/// <param name="aKey"></param>/// <param name="aDefaultValue"></param>/// <returns></returns>public string ReadValue(string aRoot, string aKey, string aDefaultValue){try{string bFile = $"{fPathBase}//{fileFolder}//{fileName}.xml";if (!File.Exists(bFile)){string bPath = $"{fPathBase}//{fileFolder}";if (!Directory.Exists(bPath)){Directory.CreateDirectory(bPath);}CreateXmlFile(aRoot, aKey, aDefaultValue);return aDefaultValue;}else{XmlDocument xml = new XmlDocument();xml.Load(bFile);XmlNode bNode = xml.SelectSingleNode($"//{aRoot}//{aKey}");return bNode.InnerText;}}catch(Exception e){return null;}}/// <summary>/// 给xml中某个节点赋值/// </summary>/// <param name="aRoot"></param>/// <param name="aKey"></param>/// <param name="aDefaultValue"></param>public void WriteValue(string aRoot, string aKey, string aDefaultValue,ref string aExMsg){try{string bFile = $"{fPathBase}//{fileFolder}//{fileName}.xml";if (File.Exists(bFile)){string bPath = $"{fPathBase}//{fileFolder}";if (!Directory.Exists(bPath)){Directory.CreateDirectory(bPath);}CreateXmlFile(aRoot, aKey, aDefaultValue);}else{XmlDocument xml = new XmlDocument();xml.Load(bFile);XmlNode bNode = xml.SelectSingleNode($"//{aRoot}//{aKey}");bNode.InnerText = aDefaultValue;}}catch(Exception e){aExMsg = e.Message;}}}