[CSharpTips]C# 读写INI文件

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读写.ini文件工具 可以直接使用

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

namespace WinFormSharpDemo.Common.Helpers
{
    /// <summary>
    /// INI文件读写工具
    /// </summary>
    public static class IniHelper
    {
        /// <summary>
        /// 为INI文件中指定的节点取得字符串
        /// </summary>
        /// <param name="lpAppName">欲在其中查找关键字的节点名称</param>
        /// <param name="lpKeyName">欲获取的项名</param>
        /// <param name="lpDefault">指定的项没有找到时返回的默认值</param>
        /// <param name="lpReturnedString">指定一个字串缓冲区，长度至少为nSize</param>
        /// <param name="nSize">指定装载到lpReturnedString缓冲区的最大字符数量</param>
        /// <param name="lpFileName">INI文件完整路径</param>
        /// <returns>复制到lpReturnedString缓冲区的字节数量，其中不包括那些NULL中止字符</returns>
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string lpAppName, string lpKeyName, string lpDefault, StringBuilder lpReturnedString, int nSize, string lpFileName);

        /// <summary>
        /// 修改INI文件中内容
        /// </summary>
        /// <param name="lpApplicationName">欲在其中写入的节点名称</param>
        /// <param name="lpKeyName">欲设置的项名</param>
        /// <param name="lpString">要写入的新字符串</param>
        /// <param name="lpFileName">INI文件完整路径</param>
        /// <returns>非零表示成功，零表示失败</returns>
        [DllImport("kernel32")]
        private static extern int WritePrivateProfileString(string lpApplicationName, string lpKeyName, string lpString, string lpFileName);


        /// <summary>
        /// 获取所有节点
        /// </summary>
        /// <param name="section"></param>
        /// <param name="key"></param>
        /// <param name="def"></param>
        /// <param name="retVal"></param>
        /// <param name="size"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        [DllImport("kernel32", EntryPoint = "GetPrivateProfileString")]

        private static extern uint GetPrivateProfileStringA(string section, string key, string def, Byte[] retVal, int size, string filePath);

        /// <summary>
        /// 获取所有节点
        /// </summary>
        /// <param name="iniFilename">文件名</param>
        /// <returns></returns>
        public static List<string> ReadSections(string iniFilename)
        {
            List<string> result = new List<string>();
            Byte[] buf = new Byte[65536];
            uint len = GetPrivateProfileStringA(null, null, null, buf, buf.Length, iniFilename);
            int j = 0;
            for (int i = 0; i < len; i++)
                if (buf[i] == 0)
                {
                    result.Add(Encoding.Default.GetString(buf, j, i - j));
                    j = i + 1;
                }
            return result;
        }

        /// <summary>
        /// 读取INI文件值
        /// </summary>
        /// <param name="section">节点名</param>
        /// <param name="key">键</param>
        /// <param name="def">未取到值时返回的默认值</param>
        /// <param name="filePath">INI文件完整路径</param>
        /// <returns>读取的值</returns>
        public static string Read(string section, string key, string def, string filePath)
        {
            StringBuilder sb = new StringBuilder(1024);
            GetPrivateProfileString(section, key, def, sb, 1024, filePath);
            return sb.ToString();
        }

        /// <summary>
        /// 写INI文件值
        /// </summary>
        /// <param name="section">欲在其中写入的节点名称</param>
        /// <param name="key">欲设置的项名</param>
        /// <param name="value">要写入的新字符串</param>
        /// <param name="filePath">INI文件完整路径</param>
        /// <returns>非零表示成功，零表示失败</returns>
        public static int Write(string section, string key, string value, string filePath)
        {
            if (!Directory.Exists(Path.GetDirectoryName(filePath)))
            {
                Directory.CreateDirectory(Path.GetDirectoryName(filePath));
            }
            return WritePrivateProfileString(section, key, value, filePath);
        }

        /// <summary>
        /// 删除节
        /// </summary>
        /// <param name="section">节点名</param>
        /// <param name="filePath">INI文件完整路径</param>
        /// <returns>非零表示成功，零表示失败</returns>
        public static int DeleteSection(string section, string filePath)
        {
            return Write(section, null, null, filePath);
        }

        /// <summary>
        /// 删除键的值
        /// </summary>
        /// <param name="section">节点名</param>
        /// <param name="key">键名</param>
        /// <param name="filePath">INI文件完整路径</param>
        /// <returns>非零表示成功，零表示失败</returns>
        public static int DeleteKey(string section, string key, string filePath)
        {
            return Write(section, key, null, filePath);
        }
    }
}

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