C#获取ini文件中全部Section，获取Section下全部Key

using System;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;
using System.Collections.Generic;
public class OperateIniFile
    {
        private static String filePath = "";
#region API函数声明

        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key,
            string val, string filePath);

　　　　  //需要调用GetPrivateProfileString的重载
        [DllImport("kernel32", EntryPoint = "GetPrivateProfileString")]
        private static extern long GetPrivateProfileString(string section, string key,
            string def, StringBuilder retVal, int size, string filePath);

        [DllImport("kernel32", EntryPoint = "GetPrivateProfileString")]
        private static extern uint GetPrivateProfileStringA(string section, string key, 
            string def, Byte[] retVal, int size, string filePath);

        #endregion
        public static List<string> ReadSections()
        {
            return ReadSections(filePath);
        }

        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;
        }

        public static List<string> ReadKeys(String SectionName)
        {
            return ReadKeys(SectionName, filePath);
        }

        public static List<string> ReadKeys(string SectionName, string iniFilename)
        {
            List<string> result = new List<string>();
            Byte[] buf = new Byte[65536];
            uint len = GetPrivateProfileStringA(SectionName, 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;
        }
public static void SetFilePath(String filepath)
        {
            filePath = filepath;
        }
        #region 读Ini文件

        public static string ReadIniData(string Section, string Key, string NoText)
        {
            return ReadIniData(Section, Key, NoText, filePath);
        }

        public static string ReadIniData(string Section, string Key, string NoText, string iniFilePath)
        {
            if (File.Exists(iniFilePath))
            {
                StringBuilder temp = new StringBuilder(1024);
                GetPrivateProfileString(Section, Key, NoText, temp, 1024, iniFilePath);
                return temp.ToString();
            }
            elsereturn String.Empty;
        }

        #endregion

        #region 写Ini文件

        public static bool WriteIniData(string Section, string Key, string Value)
        {
            return WriteIniData(Section, Key, Value, filePath);
        }
        public static bool WriteIniData(string Section, string Key, string Value, string iniFilePath)
        {
            if (File.Exists(iniFilePath))
            {
                long OpStation = WritePrivateProfileString(Section, Key, Value, iniFilePath);
                if (OpStation == 0)
                    return false;
                elsereturn true;
            }
            elsereturn false;
        }
        #endregion
    }