C#操作ini类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
namespace Sign_plate_management_system
{
    public static class IniFileUtils
    {
        public static string FilePath { get; set; }
        /// <summary>
        /// 读操作：
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="key">键</param>
        /// <param name="defVal">未读取到的默认值</param>
        /// <param name="value">读取到的值，如果该key不存在则返回空值</param>
        /// <param name="size">值的大小</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string value, StringBuilder retVal, int size, string filePath);
        /// <summary>
        /// 写操作：
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="key">键</param>
        /// <param name="val">值</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key, string value, string filePath);
        /// <summary>
        /// 验证文件是否存在
        /// </summary>
        /// <returns>布尔值</returns>
        public static bool ExistFile(string filepath)
        {
            return File.Exists(filepath);
        }
        /// <summary>
        /// 验证文件是否存在
        /// </summary>
        /// <returns>布尔值</returns>
        public static bool ExistFile()
        {
            return File.Exists(FilePath);
        }
        /// <summary>
        /// 读取int文件
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="key">键</param>
        /// <param name="defvalue">未读取到值时的默认值</param>
        /// <param name="filepath">文件路径</param>
        /// <returns>非零表示成功，零表示失败</returns>
        public static string ReadIni(string section, string key, string defvalue, string filepath)
        {
            StringBuilder retvalue = new StringBuilder();
            GetPrivateProfileString(section, key, defvalue, retvalue, 256, filepath);
            return retvalue.ToString();
        }
        /// <summary>
         /// 读取int文件
         /// </summary>
         /// <param name="section">节</param>
         /// <param name="key">键</param>
         /// <param name="defvalue">未读取到值时的默认值</param>
         /// <param name="filepath">文件路径</param>
         /// <returns>键值</returns>
        public static string ReadIni(string section, string key, string defvalue)
        {
            StringBuilder retvalue = new StringBuilder(1024);
            GetPrivateProfileString(section, key, defvalue, retvalue, 1024, FilePath);
            return retvalue.ToString();
        }
        /// <summary>
        /// 写入int文件
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        /// <param name="filepath">文件路径</param>
        /// <returns></returns>
        public static long WriteIni(string section, string key, string value, string filepath)
        {
            return WritePrivateProfileString(section, key, value, filepath);
        }
        /// <summary>
        /// 写入int文件
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        public static long WriteIni(string section, string key, string value)
        {
            return WritePrivateProfileString(section, key, value, FilePath);
        }
        /// <summary>
        /// 删除节
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="filepath">文件路径</param>
        /// <returns></returns>
        public static long DeleteSection(string section, string filepath)
        {
            return WritePrivateProfileString(section, null, null, filepath);
        }
        /// <summary>
        /// 删除节
        /// </summary>
        /// <param name="section">节</param>
        /// <returns></returns>
        public static long DeleteSection(string section)
        {
            return WritePrivateProfileString(section, null, null ,FilePath);
        }
        /// <summary>
        /// 删除键
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="key">键</param>
        /// <param name="filepath">文件路径</param>
        /// <returns></returns>
        public static long DeleteKey(string section, string key, string filepath)
        {
            return WritePrivateProfileString(section, key, null, filepath);
        }
        /// <summary>
        /// 删除键
        /// </summary>
        /// <param name="section">节</param>
        /// <param name="key">键</param>
        /// <returns></returns>
        public static long DeleteKey(string section, string key)
        {
            return WritePrivateProfileString(section, key, null, FilePath);
        }
    }
}