C#-XML文件读写

XML文件基本概念

可扩展标记语言（英语：Extensible Markup Language，简称：XML），是一种标记语言。标记指计算机所能理解的信息符号，通过此种标记，计算机之间可以处理包含各种信息的文章等。如何定义这些标记，既可以选择国际通用的标记语言，比如HTML，也可以使用像XML这样由相关人士自由决定的标记语言，这就是语言的可扩展性。XML是从标准通用标记语言（SGML）中简化修改出来的,可以在不同语言或者平台进行数据传输。

基本要素

<?xml version="1.0" encoding="utf-8"?>  <!--  文档声明   -->
<students>  <!-- 元素=标签 students为根标签 ，或者称之为根元素，程序处理时称之为节点-->
    <student name="xiaoming"></student>
    <student>
        <name>xaiohong</name>
        <!--特殊字符-->
        <read>&lt;三个火枪手&gt;</read>
    </student>
    <student>
        <name>xiaoming</name>
    </student>
    <!--![CDATA[不想解析的内容，浏览器会直接输出内容]]>-->
    <![CDATA[
        <student>
            <name>xaiodong</name>
        </student>
    ]]>
    
</students>

内容预览：

C#读写XML文档

引用命名空间
using System.Xml;

/// <summary>
/// 写入XML端口号默认index
/// </summary>
/// <param name="COMIndex">端口号Index</param>
public static void WriteXML(string COMIndex)
{
    XmlDocument xmlDoc = new XmlDocument();
    xmlDoc.Load(@"SysConfig.xml");
    //获取根节点
    XmlNode node = xmlDoc.SelectSingleN("configuration");
    XmlNodeList nodeList = node.ChildNodes;
    foreach (XmlNode xn in nodeList)
    {
       XmlNodeList childList =xn.ChildNodes;
        foreach (XmlNode node1 in childList)
        {
            node1.InnerText = COMIndex;//修改端口号配置
            break;
        }
        break;
    }
    xmlDoc.Save("SysConfig.xml");
}

using System.Data;
using System.IO;

namespace Serialport.Operate
{
    class ReadSysConfig
    {
        private static string _strcomIndex = string.Empty;
        private static string _strchannelColor = string.Empty;
        private static string _strtrendTime = string.Empty;

        private static string _strmaxAmplitude = string.Empty;
        private static string _strminAmplitude = string.Empty;
        private static string _strinterval = string.Empty;

        public static void LoadConfig()
        {
            DataTable m_dtSysConfig = new DataTable();
            //加载系统配置参数
            m_dtSysConfig.Columns.Add(FileNameSysConfig.comIndex, typeof(string));
            m_dtSysConfig.Columns.Add(FileNameSysConfig.channelColor, typeof(string));
            m_dtSysConfig.Columns.Add(FileNameSysConfig.trendTime, typeof(string));
            m_dtSysConfig.Columns.Add(FileNameSysConfig.maxAmplitude, typeof(string));
            m_dtSysConfig.Columns.Add(FileNameSysConfig.minAmplitude, typeof(string));
            NewMethod(m_dtSysConfig);
            m_dtSysConfig.TableName = "Sysconfig";
            if (File.Exists(FilePathSysConfig.configXmlPath))
            {
                m_dtSysConfig.ReadXml(FilePathSysConfig.configXmlPath);

                _strcomIndex = m_dtSysConfig.Rows[0][FileNameSysConfig.comIndex].ToString().Trim();
                _strchannelColor = m_dtSysConfig.Rows[0][FileNameSysConfig.channelColor].ToString().Trim();
                _strtrendTime = m_dtSysConfig.Rows[0][FileNameSysConfig.trendTime].ToString().Trim();
                _strmaxAmplitude = m_dtSysConfig.Rows[0][FileNameSysConfig.maxAmplitude].ToString().Trim();
                _strminAmplitude = m_dtSysConfig.Rows[0][FileNameSysConfig.minAmplitude].ToString().Trim();
                _strinterval = m_dtSysConfig.Rows[0][FileNameSysConfig.interval].ToString().Trim();
            }
        }

        private static void NewMethod(DataTable m_dtSysConfig)
        {
            m_dtSysConfig.Columns.Add(FileNameSysConfig.interval, typeof(string));
        }

        public static string StrcomIndex { get => _strcomIndex; set => _strcomIndex = value; }
        public static string StrchannelColor { get => _strchannelColor; set => _strchannelColor = value; }
        public static string StrtrendTime { get => _strtrendTime; set => _strtrendTime = value; }
        public static string StrmaxAmplitude { get => _strmaxAmplitude; set => _strmaxAmplitude = value; }
        public static string StrminAmplitude { get => _strminAmplitude; set => _strminAmplitude = value; }
        public static string Strinterval { get => _strinterval; set => _strinterval = value; }
    }

    class FileNameSysConfig//初始化
    {
        public static readonly string comIndex = "comIndex";
        public static readonly string channelColor = "channelColor";
        public static readonly string trendTime = "trendTime";
        public static readonly string minAmplitude = "minAmplitude";
        public static readonly string maxAmplitude = "maxAmplitude";
        public static readonly string interval = "interval";
    }
    class FilePathSysConfig
    {
        public static readonly string configXmlPath = @"SysConfig.xml";
    }
}