C#读写XML

  
    

   
     using
   
      System;

   
     using
   
      System.Collections.Generic;

   
     using
   
      System.Text;

   
     using
   
      System.IO;

   
     using
   
      System.Xml;


   
     namespace
   
      AutoRunMgr
{
 
   
     public
   
      
   
     class
   
      XML
 {
 
   
     public
   
      
   
     static
   
      
   
     void
   
      CreateNode(
   
     string
   
      xmlpath,
   
     string
   
      node,
   
     string
   
      value)
 {
 
   
     if
   
      (
   
     !
   
     File.Exists(xmlpath))
 {
 XmlDocument xmlDoc 
   
     =
   
      
   
     new
   
      XmlDocument();
 XmlElement root 
   
     =
   
      xmlDoc.CreateElement(
   
     "
   
     setting
   
     "
   
     );
 XmlElement child 
   
     =
   
      xmlDoc.CreateElement(node);
 child.InnerText 
   
     =
   
      value;
 root.AppendChild(child);
 xmlDoc.AppendChild(root);
 xmlDoc.Save(
   
     @"
   
     setting.xml
   
     "
   
     );
 }
 
   
     else
   
     
 {
 XmlDocument xmlDoc 
   
     =
   
      
   
     new
   
      XmlDocument();
 xmlDoc.Load(xmlpath);
 XmlNode root 
   
     =
   
      xmlDoc.DocumentElement;
 XmlNode child 
   
     =
   
      root.SelectSingleNode(node);
 
   
     if
   
      (child 
   
     ==
   
      
   
     null
   
     )
 {
 child
   
     =
   
     xmlDoc.CreateElement(node);
 }
 child.InnerText 
   
     =
   
      value; 
 root.AppendChild(child);
 xmlDoc.AppendChild(root);
 xmlDoc.Save(
   
     @"
   
     setting.xml
   
     "
   
     );
 }
 }
 
   
     public
   
      
   
     static
   
      
   
     string
   
      ReadNode(
   
     string
   
      xmlpath, 
   
     string
   
      node)
 {
 
   
     if
   
      (File.Exists(xmlpath))
 {
 XmlDocument xmlDoc 
   
     =
   
      
   
     new
   
      XmlDocument();
 xmlDoc.Load(xmlpath);
 XmlElement root 
   
     =
   
      xmlDoc.DocumentElement;
 XmlNode child 
   
     =
   
      root.SelectSingleNode(node);
   
     //
   
     查找<node>
   
     

   
     
 
   
     return
   
      (child 
   
     ==
   
      
   
     null
   
     ) 
   
     ?
   
      
   
     ""
   
      : child.InnerText;
 }
 
   
     else
   
     
 {
 
   
     return
   
      
   
     ""
   
     ;
 }
 }
 }
}