C# 读写XML文件实例代码

时间:2021-05-20

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

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

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。

到此这篇关于C# 读写XML文件实例代码的文章就介绍到这了,更多相关C# 读写XML文件最简单方法内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持!

声明:本页内容来源网络,仅供用户参考;我单位不保证亦不表示资料全面及准确无误,也不保证亦不表示这些资料为最新信息,如因任何原因,本网内容或者用户因倚赖本网内容造成任何损失或损害,我单位将不会负任何法律责任。如涉及版权问题,请提交至online#300.cn邮箱联系删除。

相关文章