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C#读写XML文件

2020-03-04 | 秩名 | 点击：次

C#史上最简单读写xml文件方式，创建控制台应用程序赋值代码，就可以运行，需要改动，请自行调整

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
 
namespace ConsoleApp1
{
  class Program
  {
    public const String xmlPath = "info.xml";
 
    static void Main(string[] args)
    {
 
      IDictionary<String, List<String>> infos = new Dictionary<String, List<String>>();
 
      infos.Add("Evan", new List<string>() { "123", "456" });
 
      SaveXML(infos);
 
      ReadXML();
      Console.ReadKey();
    }
 
    public static void SaveXML(IDictionary<String, List<String>> infos)
    {
      if (infos == null || infos.Count == 0)
      {
        return;
      }
 
      XmlDocument xmlDoc = new XmlDocument();
 
      XmlDeclaration dec = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);
 
      xmlDoc.AppendChild(dec);
 
      XmlElement _infos = xmlDoc.CreateElement("infos");
 
      foreach (KeyValuePair<String, List<String>> item in infos)
      {
        XmlElement info = xmlDoc.CreateElement("info");
 
        XmlElement name = xmlDoc.CreateElement("file1");
        name.InnerText = item.Key;
 
        info.AppendChild(name);
 
        XmlNode filelist = xmlDoc.CreateElement("filelist");
 
        info.AppendChild(filelist);
 
        foreach (String number in item.Value)
        {
          XmlElement filed = xmlDoc.CreateElement("filed");
          filed.InnerText = number;
 
          filelist.AppendChild(filed);
        }
 
        _infos.AppendChild(info);
      }
 
      xmlDoc.AppendChild(_infos);
 
      xmlDoc.Save(xmlPath);
    }
 
    public static IDictionary<String, List<String>> ReadXML()
    {
      IDictionary<String, List<String>> infos = new Dictionary<String, List<String>>();
 
      if (File.Exists(xmlPath))
      {
        XmlDocument xmlDoc = new XmlDocument();
 
        xmlDoc.Load(xmlPath);
 
        XmlNode xn = xmlDoc.SelectSingleNode("infos");
 
        XmlNodeList xnl = xn.ChildNodes;
 
        foreach (XmlNode xnf in xnl)
        {
          XmlElement xe = (XmlElement)xnf;
 
          XmlNode nameNode = xe.SelectSingleNode("file1");
 
          string name = nameNode.InnerText;
          Console.WriteLine(name);
          XmlNode filelist = xe.SelectSingleNode("filelist");
 
          List<String> list = new List<string>();
 
          foreach (XmlNode item in filelist.ChildNodes)
          {
            list.Add(item.InnerText);
          }
 
          infos.Add(name, list);
        }
      }
 
      return infos;
    }
  }
}

内容扩展：

实例代码

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dim domxmldocument as system.xml.xmldocument
  dim tmppath as string = apptempfilepath
  dim xmlfile as string = tmppath + "＼testxml.xml"
 '窗体加载事件
  private sub testxml_load(byval sender as system.object, byval e as system.eventargs) handles mybase.load
  '读xml过程测试通过
  dim domxmldocument as system.xml.xmldocument
  dim tmppath as string = apptempfilepath
  dim xmlfile as string = tmppath + "＼testxml.xml"
  dim reader as system.xml.xmlreader = nothing
  try
  reader = new xml.xmltextreader(xmlfile)
  'reader.
  while reader.read
  me.lboxxml.items.add(reader.name + reader.value)
  end while
  catch ex as exception
  msgbox(ex.message)
  finally
  if not (reader is nothing) then
  reader.close()
  end if
  end try
  end sub
  '载入xml事件
  private sub btnxmlload_click(byval sender as system.object, byval e as system.eventargs) handles btnxmlload.click
  'me.lboxxml.items.clear()
  ''读xml过程测试通过
  'dim reader as system.xml.xmlreader = nothing
  'try
  ' reader = new xml.xmltextreader(xmlfile)
  ' while reader.read
  ' me.lboxxml.items.add(reader.name + ":" + reader.value)
  ' end while
  'catch ex as exception
  ' msgbox(ex.message)
  'finally
  ' if not (reader is nothing) then
  ' reader.close()
  ' end if
  'end try
  dim ds as new dataset
  try
  '如果直接使用ds做datasource则不会展开datagrid，用dv则能直接显示正确。
  ds.readxml(xmlfile)
  dim tb as datatable
  dim dv as dataview
  tb = ds.tables(0)
  dv = new dataview(tb)
  datagrid1.datasource = dv
  'datagrid1.datamember = "testxmlmember"
  'datagrid1.datamember = "employeefname"
  'dim dxd as new xmldatadocument
  catch ex as exception
  msgbox(ex.message.tostring)
  end try
  end sub
  '保存新建xml内容事件
  private sub btnsavenew_click(byval sender as system.object, byval e as system.eventargs) handles btnsavenew.click
  dim mytw as new xmltextwriter(tmppath + "＼testxmlwrite.xml", nothing)
  mytw.writestartdocument()
  mytw.formatting = formatting.indented
  mytw.writestartelement("team")
  mytw.writestartelement("player")
  mytw.writeattributestring("name", "george zip")
  mytw.writeattributestring("position", "qb")
  mytw.writeelementstring("nickname", "zippy")
  mytw.writeelementstring("jerseynumber", xmlconvert.tostring(7))
  mytw.writeendelement()
  mytw.writeendelement()
  mytw.writeenddocument()
  mytw.close()
  end sub

文件很大的情况下，可以考虑手动实现数据更新适配器，比如手动实现一个xml节点搜索/更新，这样就不用重写整个xml。
如果程序的i/o不是主要问题，还是用实体类整个的写入更新吧，毕竟数据的完整性是第一位的。
如是文章类的，对该目录建一个xml索引文件来存放文章的编号，url等，用xml的attribute作为标记不同字段，内容页面可以用另外的html或xml页面存放，用linq to xml操作数据，效率不是很差，个人观点。当搜索时候只要查询指定文件名xml或文件类型就可以了。

原文链接：https://www.cnblogs.com/OmySql/p/12405569.html
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