c#实现ini文件读写的类

/// <summary>
/// 读写INI文件的类。
/// </summary>
public class INIHelper
{
   // 读写INI文件相关。
   [DllImport("kernel32.dll", EntryPoint = "WritePrivateProfileString", CharSet = CharSet.Ansi)]
   public static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
   [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileString", CharSet = CharSet.Ansi)]
   public static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);
   [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileSectionNames", CharSet = CharSet.Ansi)]
   public static extern int GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer, int nSize, string filePath);
   [DllImport("KERNEL32.DLL ", EntryPoint = "GetPrivateProfileSection", CharSet = CharSet.Ansi)]
   public static extern int GetPrivateProfileSection(string lpAppName, byte[] lpReturnedString, int nSize, string filePath);

   /// <summary>
   /// 向INI写入数据。
   /// </summary>
   /// <PARAM name="Section">节点名。</PARAM>
   /// <PARAM name="Key">键名。</PARAM>
   /// <PARAM name="Value">值名。</PARAM>
   public static void Write(string Section, string Key, string Value, string path)
   {
       WritePrivateProfileString(Section, Key, Value, path);
   }

   /// <summary>
   /// 读取INI数据。
   /// </summary>
   /// <PARAM name="Section">节点名。</PARAM>
   /// <PARAM name="Key">键名。</PARAM>
   /// <PARAM name="Path">值名。</PARAM>
   /// <returns>相应的值。</returns>
   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();
   }
   /// <summary>
   /// 读取一个ini里面所有的节
   /// </summary>
   /// <param name="sections"></param>
   /// <param name="path"></param>
   /// <returns></returns>
   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('');
       return 0;
   }
   /// <summary>
   /// 得到某个节点下面所有的key和value组合
   /// </summary>
   /// <param name="section"></param>
   /// <param name="keys"></param>
   /// <param name="values"></param>
   /// <param name="path"></param>
   /// <returns></returns>
   public static int GetAllKeyValues(string section, out string[] keys, out string[] values, string path)
   { // www.jb200.com
       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];
       values = 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();
          values[i] = item[1].Trim();
      }
      else if (item.Length == 1)
      {
          keys[i] = item[0].Trim();
          values[i] = "";
      }
      else if (item.Length == 0)
      {
          keys[i] = "";
          values[i] = "";
      }
       }
       return 0;
   }
}