C# 读写XML(代码分享)

读xml

xmldocument xd = new xmldocument(); 
      string filename = @"d:\test.xml";
      xd.load(filename);
      xmlnodelist xmlnotelist = xd.getelementsbytagname("user");
      list<user> users = new list<user>();
     
      foreach (xmlelement item in xmlnotelist)
      {
        user user = new user();
        user.id = int.parse(item.getattribute("id"));
        xmlnodelist xnl = item.childnodes;
        user.name = xnl[0].innerxml;
        user.age =int.parse(xnl[1].innerxml);
        user.gender = xnl[2].innerxml;
        users.add(user);
      }
      foreach (var item in users)
      {
        console.writeline(item);
      }

read xml

<?xml version="1.0" encoding="gb2312"?>
<users>
  <user id='1'>
    <name >张三</name>
    <age>15</age>
    <gender>男</gender>
  </user>
  <user id='2'>
    <name>李四</name>
    <age>14</age>
    <gender>男</gender>
  </user>
</users>

test.xml

写xml

string filename =@"d:\test.xml";
      xmldocument xmldoc = new xmldocument();
      xmlnode header = xmldoc.createxmldeclaration("1.0","utf-8",null);
      xmldoc.appendchild(header);
      //创建一级节点
      xmlelement rootnode = xmldoc.createelement("users");
      list<user> list = getusers();
      foreach (var item in list)
      {
        xmlelement xn = inseruser(item,xmldoc);
        rootnode.appendchild(xn);
      }  
      xmldoc.appendchild(rootnode);
      xmldoc.save(filename);
    }
    /// <summary>
    /// 创建整个user的元素
    /// </summary>
    /// <param name="user"></param>
    /// <param name="xmldoc"></param>
    /// <returns></returns>
    private static xmlelement inseruser(user user, xmldocument xmldoc)
    {
      xmlelement xn = xmldoc.createelement("user");
      xn.setattribute("id", user.id + "");
      xn.appendchild(getxmlnode(xmldoc,"name",user.name));
      xn.appendchild(getxmlnode(xmldoc, "age", user.age + ""));
      xn.appendchild(getxmlnode(xmldoc, "gender", user.gender));
      return xn;
    }
    private static xmlelement getxmlnode(xmldocument xmldoc,string name,string value)
    {
      xmlelement xn = xmldoc.createelement(name);
      xn.innertext = value;
      return xn;
    }
    private static list<user> getusers()
    {
      list<user> list = new list<user>();
      for (int i = 0; i < 10; i++)
      {
        user user = new user();
        user.id = i;
        user.name = "name" + i;
        user.age = 15;
        user.gender = "男";
        list.add(user);
      }
      return list;
    }

write xml

实体类

class user
  {
    public int id { set; get; }
    public string name { get; set; }
    public int age { get; set; }
    public string gender { set; get; }
    public override string tostring()
    {
      return id +","+name + "," +age+"," + gender;
    }
  }

entity

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