c# winform程序读写ini配置文件

背景：本来准备使用settings.settings来保存数据库配置等信息的。但是设置为“应用程序”级别，就没法方便的用 Properties.Settings.Default.Save() 更改保存。 且没法在程序不重启的情况下应用修改后的配置。如果设置为“用户”级别，就存在配置信息保存到appData文件夹下被清空缓存失效的风险。因此回过头来选择ini来保存这些配置信息

网上找了个ini读写操作类，直接copy拿来用，测试可用，代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;


namespace data_migration_desk.utils
{
    // INI文件操作类
    class IniFileHelper
    {
        string strIniFilePath;  // ini配置文件路径

        // 返回0表示失败，非0为成功
        [DllImport("kernel32", CharSet = CharSet.Auto)]
        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);

        // 返回取得字符串缓冲区的长度
        [DllImport("kernel32", CharSet = CharSet.Auto)]
        private static extern long GetPrivateProfileString(string section, string key, string strDefault, StringBuilder retVal, int size, string filePath);

        [DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
        public static extern int GetPrivateProfileInt(string section, string key, int nDefault, string filePath);

        /// <summary>
        /// 无参构造函数
        /// </summary>
        /// <returns></returns>
        public IniFileHelper()
        {
            this.strIniFilePath = Directory.GetCurrentDirectory() + "\Properties\sysconfig.ini";
        }


        /// <summary>
        /// 有参构造函数
        /// </summary>
        /// <param name="strIniFilePath">ini配置文件路径</param>
        /// <returns></returns>
        public IniFileHelper(string strIniFilePath)
        {
            if (strIniFilePath != null)
            {
                this.strIniFilePath = strIniFilePath;
            }
        }


        /// <summary>
        /// 获取ini配置文件中的字符串
        /// </summary>
        /// <param name="section">节名</param>
        /// <param name="key">键名</param>
        /// <param name="strDefault">默认值</param>
        /// <param name="retVal">结果缓冲区</param>
        /// <param name="size">结果缓冲区大小</param>
        /// <returns>成功true,失败false</returns>
        public bool GetIniString(string section, string key, string strDefault, StringBuilder retVal, int size)
        {
            long liRet = GetPrivateProfileString(section, key, strDefault, retVal, size, strIniFilePath);
            return (liRet >= 1);
        }


        /// <summary>
        /// 获取ini配置文件中的整型值
        /// </summary>
        /// <param name="section">节名</param>
        /// <param name="key">键名</param>
        /// <param name="nDefault">默认值</param>
        /// <returns></returns>
        public int GetIniInt(string section, string key, int nDefault)
        {
            return GetPrivateProfileInt(section, key, nDefault, strIniFilePath);
        }


        /// <summary>
        /// 往ini配置文件写入字符串
        /// </summary>
        /// <param name="section">节名</param>
        /// <param name="key">键名</param>
        /// <param name="val">要写入的字符串</param>
        /// <returns>成功true,失败false</returns>
        public bool WriteIniString(string section, string key, string val)
        {
            long liRet = WritePrivateProfileString(section, key, val, strIniFilePath);
            return (liRet != 0);
        }


        /// <summary>
        /// 往ini配置文件写入整型数据
        /// </summary>
        /// <param name="section">节名</param>
        /// <param name="key">键名</param>
        /// <param name="val">要写入的数据</param>
        /// <returns>成功true,失败false</returns>
        public bool WriteIniInt(string section, string key, int val)
        {
            return WriteIniString(section, key, val.ToString());
        }
    }
}

使用方法：

读取：

            IniFileHelper iniFileHelper = new IniFileHelper();
            StringBuilder sb = new StringBuilder(60);
            iniFileHelper.GetIniString("tokeninfo", "apiUrl", "", sb, sb.Capacity);
            string aaa = sb.ToString();

写入：

            IniFileHelper iniFileHelper = new IniFileHelper();
            iniFileHelper.WriteIniString("tokeninfo", "apiUrl", "newString");

其中，ini配置文件有一些需要讲究的地方，不然，就会出现读取不到值的情况