C#读写自定义的Config文件的实现方法

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="COM1" value="我是一个串口号" />
  </appSettings>
</configuration>

using System.Configuration;
 
namespace Utils
{
    public class ConfigHelper
    {
        private string ConfigPath = string.Empty;
 
        /// <summary>
        /// 获取配置文件指定的Key
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public string GetConfigKey(string key)
        {
            Configuration ConfigurationInstance = ConfigurationManager.OpenMappedExeConfiguration(new ExeConfigurationFileMap()
            {
                ExeConfigFilename = ConfigPath
            }, ConfigurationUserLevel.None);
 
            if (ConfigurationInstance.AppSettings.Settings[key] != null)
                return ConfigurationInstance.AppSettings.Settings[key].Value;
            else
                return string.Empty;
        }
 
        /// <summary>
        /// 设置配置文件指定的Key，如果Key不存在则添加
        /// </summary>
        /// <param name="key"></param>
        /// <param name="vls"></param>
        /// <returns></returns>
        public bool SetConfigKey(string key, string vls)
        {
            try
            {
                Configuration ConfigurationInstance = ConfigurationManager.OpenMappedExeConfiguration(new ExeConfigurationFileMap()
                {
                    ExeConfigFilename = ConfigPath
                }, ConfigurationUserLevel.None);
 
                if (ConfigurationInstance.AppSettings.Settings[key] != null)
                    ConfigurationInstance.AppSettings.Settings[key].Value = vls;
                else
                    ConfigurationInstance.AppSettings.Settings.Add(key, vls);
 
                ConfigurationInstance.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");
                return true;
            }
            catch
            {
                return false;
            }
        }
 
 
        public ConfigHelper(string configPath)
        {
            ConfigPath = configPath;
        }
    }
}

using System;
using System.windows.FORMs;
using Utils;
 
namespace Test2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private ConfigHelper ConfigHelpers = null;
 
        private void Form1_Load(object sender, EventArgs e)
        {
            string configPath = Application.StartupPath + "\\Config\\SystemInfo.config";
            ConfigHelpers = new ConfigHelper(configPath);
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            //读取Key
            //string value = ConfigHelpers.GetConfigKey("COM1");
            //Console.WriteLine(value);
 
            //设置Key
            bool result = ConfigHelpers.SetConfigKey("游戏名", "XX信条");
 
            Console.WriteLine("执行完毕");
        }
    }
}

string value = ConfigHelpers.GetConfigKey("COM1");

bool result = ConfigHelpers.SetConfigKey("游戏名", "XX信条");