使用INI配置文件，简单便捷。

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该辅助工具类为C#操作INI文件的辅助类，源码在某位师傅的基础上完善的来，因为忘记最初的来源了，因此不能提及引用，在此深感遗憾，并对贡献者表示感谢。

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

namespace Eyuan.Common
{
 public static class INIHelper
 {

  #region 读写INI文件相关
  [DllImport("kernel32.dll", EntryPoint = "WritePrivateProfileString", CharSet = CharSet.Ansi)]
  private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);

  [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileString", CharSet = CharSet.Ansi)]
  private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);

  [DllImport("kernel32")]
  private static extern int GetPrivateProfileInt(string lpApplicationName, string lpKeyName, int nDefault, string lpFileName);


  [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileSectionNames", CharSet = CharSet.Ansi)]
  private static extern int GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer, int nSize, string filePath);

  [DllImport("KERNEL32.DLL ", EntryPoint = "GetPrivateProfileSection", CharSet = CharSet.Ansi)]
  private static extern int GetPrivateProfileSection(string lpAppName, byte[] lpReturnedString, int nSize, string filePath);
  #endregion

  #region 读写操作（字符串）
  /// 

  /// 向INI写入数据
  /// 
  /// 节点名
  /// 键名
  /// 值（字符串）
  public static void Write(string Section, string Key, string Value, string path)
  {
   WritePrivateProfileString(Section, Key, Value, path);
  }
  /// 

  /// 读取INI数据
  /// 
  /// 节点名
  /// 键名
  /// 值名
  /// 值（字符串）
  public static string Read(string Section, string Key, string path)
  {
   StringBuilder temp = new StringBuilder(255);
   int i = GetPrivateProfileString(Section, Key, "", temp, 255, path);
   return temp.ToString();
  }
  #endregion

  #region 配置节信息
  /// 

  /// 读取一个ini里面所有的节
  /// 
  /// 
  /// 
  /// -1:没有节信息，0:正常
  public static int GetAllSectionNames(out string[] sections, string path)
  {
   int MAX_BUFFER = 32767;
   IntPtr pReturnedString = Marshal.AllocCoTaskMem(MAX_BUFFER);
   int bytesReturned = GetPrivateProfileSectionNames(pReturnedString, MAX_BUFFER, path);
   if (bytesReturned == 0)
   {
    sections = null;
    return -1;
   }
   string local = Marshal.PtrToStringAnsi(pReturnedString, (int)bytesReturned).ToString();
   Marshal.FreeCoTaskMem(pReturnedString);
   //use of Substring below removes terminating null for split
   sections = local.Substring(0, local.Length - 1).Split('\0');
   return 0;
  }
  /// 

  /// 返回指定配置文件下的节名称列表
  /// 
  /// 
  /// 
  public static List GetAllSectionNames(string path)
  {
   List sectionList = new List();
   int MAX_BUFFER = 32767;
   IntPtr pReturnedString = Marshal.AllocCoTaskMem(MAX_BUFFER);
   int bytesReturned = GetPrivateProfileSectionNames(pReturnedString, MAX_BUFFER, path);
   if (bytesReturned != 0)
   {
    string local = Marshal.PtrToStringAnsi(pReturnedString, (int)bytesReturned).ToString();
    Marshal.FreeCoTaskMem(pReturnedString);
    sectionList.AddRange(local.Substring(0, local.Length - 1).Split('\0'));
   }
   return sectionList;
  }

  /// 

  /// 得到某个节点下面所有的key和value组合
  /// 
  /// 指定的节名称
  /// Key数组
  /// Value数组
  /// INI文件路径
  /// 
  public static int GetAllKeyValues(string section, out string[] keys, out string[] values, string path)
  {
   byte[] b = new byte[65535];//配置节下的所有信息
   GetPrivateProfileSection(section, b, b.Length, path);
   string s = System.Text.Encoding.Default.GetString(b);//配置信息
   string[] tmp = s.Split((char)0);//Key\Value信息
   List result = new List();
   foreach (string r in tmp)
   {
    if (r != string.Empty)
     result.Add(r);
   }
   keys = new string[result.Count];
   values = new string[result.Count];
   for (int i = 0; i < result.Count; i++)
   {
    string[] item = result[i].Split(new char[] { '=' });//Key=Value格式的配置信息
    //Value字符串中含有=的处理，
    //一、Value加""，先对""处理
    //二、Key后续的都为Value
    if (item.Length > 2)
    {
     keys[i] = item[0].Trim();
     values[i] = result[i].Substring(keys[i].Length + 1);
    }
    if (item.Length == 2)//Key=Value
    {
     keys[i] = item[0].Trim();
     values[i] = item[1].Trim();
    }
    else if (item.Length == 1)//Key=
    {
     keys[i] = item[0].Trim();
     values[i] = "";
    }
    else if (item.Length == 0)
    {
     keys[i] = "";
     values[i] = "";
    }
   }
   return 0;
  }
  /// 

  /// 得到某个节点下面所有的key
  /// 
  /// 指定的节名称
  /// Key数组
  /// INI文件路径
  /// 
  public static int GetAllKeys(string section, out string[] keys, string path)
  {
   byte[] b = new byte[65535];

   GetPrivateProfileSection(section, b, b.Length, path);
   string s = System.Text.Encoding.Default.GetString(b);
   string[] tmp = s.Split((char)0);
   ArrayList result = new ArrayList();
   foreach (string r in tmp)
   {
    if (r != string.Empty)
     result.Add(r);
   }
   keys = new string[result.Count];
   for (int i = 0; i < result.Count; i++)
   {
    string[] item = result[i].ToString().Split(new char[] { '=' });
    if (item.Length == 2)
    {
     keys[i] = item[0].Trim();
    }
    else if (item.Length == 1)
    {
     keys[i] = item[0].Trim();
    }
    else if (item.Length == 0)
    {
     keys[i] = "";
    }
   }
   return 0;
  }
  /// 

  /// 获取指定节下的Key列表
  /// 
  /// 指定的节名称
  /// 配置文件名称
  /// Key列表
  public static List GetAllKeys(string section, string path)
  {
   List keyList = new List();
   byte[] b = new byte[65535];
   GetPrivateProfileSection(section, b, b.Length, path);
   string s = System.Text.Encoding.Default.GetString(b);
   string[] tmp = s.Split((char)0);
   List result = new List();
   foreach (string r in tmp)
   {
    if (r != string.Empty)
     result.Add(r);
   }
   for (int i = 0; i < result.Count; i++)
   {
    string[] item = result[i].Split(new char[] { '=' });
    if (item.Length == 2 || item.Length == 1)
    {
     keyList.Add(item[0].Trim());
    }
    else if (item.Length == 0)
    {
     keyList.Add(string.Empty);
    }
   }
   return keyList;
  }
  /// 

  /// 获取值
  /// 
  /// 
  /// 
  /// 
  public static List GetAllValues(string section, string path)
  {
   List keyList = new List();
   byte[] b = new byte[65535];
   GetPrivateProfileSection(section, b, b.Length, path);
   string s = System.Text.Encoding.Default.GetString(b);
   string[] tmp = s.Split((char)0);
   List result = new List();
   foreach (string r in tmp)
   {
    if (r != string.Empty)
     result.Add(r);
   }
   for (int i = 0; i < result.Count; i++)
   {
    string[] item = result[i].Split(new char[] { '=' });
    if (item.Length == 2 || item.Length == 1)
    {
     keyList.Add(item[1].Trim());
    }
    else if (item.Length == 0)
    {
     keyList.Add(string.Empty);
    }
   }
   return keyList;
  }
  
  #endregion

  #region 通过值查找键（一个节中的键唯一，可能存在多个键值相同，因此反查的结果可能为多个）

  /// 

  /// 第一个键
  /// 
  /// 
  /// 
  /// 
  /// 
  public static string GetFirstKeyByValue(string section, string path, string value)
  {
   foreach (string key in GetAllKeys(section, path))
   {
    if (ReadString(section, key, "", path) == value)
    {
     return key;
    }
   }
   return string.Empty;
  }
  /// 

  /// 所有键
  /// 
  /// 
  /// 
  /// 
  /// 
  public static List GetKeysByValue(string section, string path, string value)
  {
   List keys = new List();
   foreach (string key in GetAllKeys(section, path))
   {
    if (ReadString(section, key, "", path) == value)
    {
     keys.Add(key);
    }
   }
   return keys;
  }
  #endregion


  #region 具体类型的读写

  #region string
  /// 

  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  public static string ReadString(string sectionName, string keyName, string defaultValue, string path)
  {
   const int MAXSIZE = 255;
   StringBuilder temp = new StringBuilder(MAXSIZE);
   GetPrivateProfileString(sectionName, keyName, defaultValue, temp, 255, path);
   return temp.ToString();
  }

  /// 

  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  public static void WriteString(string sectionName, string keyName, string value, string path)
  {
   WritePrivateProfileString(sectionName, keyName, value, path);
  }
  #endregion

  #region Int
  /// 

  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  public static int ReadInteger(string sectionName, string keyName, int defaultValue, string path)
  {

   return GetPrivateProfileInt(sectionName, keyName, defaultValue, path);

  }
  /// 

  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  public static void WriteInteger(string sectionName, string keyName, int value, string path)
  {

   WritePrivateProfileString(sectionName, keyName, value.ToString(), path);

  }
  #endregion

  #region bool
  /// 

  /// 读取布尔值
  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  public static bool ReadBoolean(string sectionName, string keyName, bool defaultValue, string path)
  {

   int temp = defaultValue ? 1 : 0;

   int result = GetPrivateProfileInt(sectionName, keyName, temp, path);

   return (result == 0 ? false : true);

  }
  /// 

  /// 写入布尔值
  /// 
  /// 
  /// 
  /// 
  /// 
  public static void WriteBoolean(string sectionName, string keyName, bool value, string path)
  {
   string temp = value ? "1 " : "0 ";
   WritePrivateProfileString(sectionName, keyName, temp, path);
  }
  #endregion

  #endregion

  #region 删除操作
  /// 

  /// 删除指定项
  /// 
  /// 
  /// 
  /// 
  public static void DeleteKey(string sectionName, string keyName, string path)
  {
   WritePrivateProfileString(sectionName, keyName, null, path);
  }

  /// 

  /// 删除指定节下的所有项
  /// 
  /// 
  /// 
  public static void EraseSection(string sectionName, string path)
  {
   WritePrivateProfileString(sectionName, null, null, path);
  }
  #endregion

  #region 判断节、键是否存在
  /// 

  /// 指定节知否存在
  /// 
  /// 
  /// 
  /// 
  public static bool ExistSection(string section, string fileName)
  {
   string[] sections = null;
   GetAllSectionNames(out sections, fileName);
   if (sections != null)
   {
    foreach (var s in sections)
    {
     if (s == section)
     {
      return true;
     }
    }
   }
   return false;
  }
  /// 

  /// 指定节下的键是否存在
  /// 
  /// 
  /// 
  /// 
  /// 
  public static bool ExistKey(string section, string key, string fileName)
  {
   string[] keys = null;
   GetAllKeys(section, out keys, fileName);
   if (keys != null)
   {
    foreach (var s in keys)
    {
     if (s == key)
     {
      return true;
     }
    }
   }
   return false;
  }
  #endregion

  #region 同一Section下添加多个Key\Value
  /// 

  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  public static bool AddSectionWithKeyValues(string section, List keyList, List valueList, string path)
  {
   bool bRst = true;
   //判断Section是否已经存在，如果存在，返回false
   //已经存在，则更新
   //if (GetAllSectionNames(path).Contains(section))
   //{
   // return false;
   //}
   //判断keyList中是否有相同的Key，如果有，返回false

   //添加配置信息
   for (int i = 0; i < keyList.Count; i++)
   {
    WriteString(section, keyList[i], valueList[i], path);
   }
   return bRst;
  }
  #endregion
 }
}

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