C#通过P/Invoke读写INI配置文件的完整类实现

using System;
using System.Runtime.InteropServices;
using System.Text;

namespace DotNet.Utilities
{
  /// <summary>
  /// INI文件读写类。
  /// </summary>
  public class INIFile
  {
    // 存储INI文件的物理路径
    public string path;

    // 构造函数，初始化时指定配置文件路径
    public INIFile(string INIPath)
    {
      path = INIPath;
    }

    // 声明内核API函数：写入INI文件
    [DllImport("kernel32")]
    private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);

    // 声明内核API函数：读取字符串类型值
    [DllImport("kernel32")]
    private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);

    // 声明内核API函数：读取字节数组类型值
    [DllImport("kernel32")]
    private static extern int GetPrivateProfileString(string section, string key, string defVal, Byte[] retVal, int size, string filePath);

    /// <summary>
    /// 写INI文件：向指定节和键写入值
    /// </summary>
    /// <param name="Section">节名</param>
    /// <param name="Key">键名</param>
    /// <param name="Value">要写入的值</param>
    public void IniWriteValue(string Section, string Key, string Value)
    {
      WritePrivateProfileString(Section, Key, Value, this.path);
    }

    /// <summary>
    /// 读取INI文件：返回指定键对应的字符串值
    /// </summary>
    /// <param name="Section">节名</param>
    /// <param name="Key">键名</param>
    /// <returns>如果找不到则返回空字符串</returns>
    public string IniReadValue(string Section, string Key)
    {
      // 预分配内存缓冲区，防止截断
      StringBuilder temp = new StringBuilder(255);
      int i = GetPrivateProfileString(Section, Key, "", temp, 255, this.path);
      return temp.ToString();
    }

    /// <summary>
    /// 读取INI文件：以字节数组形式返回原始数据
    /// </summary>
    public byte[] IniReadValues(string section, string key)
    {
      byte[] temp = new byte[255];
      int i = GetPrivateProfileString(section, key, "", temp, 255, this.path);
      return temp;
    }

    /// <summary>
    /// 删除ini文件下所有段落（清空整个文件）
    /// </summary>
    public void ClearAllSection()
    {
      // 将section和key设为null可清空整个文件
      IniWriteValue(null, null, null);
    }

    /// <summary>
    /// 删除ini文件下指定段落下的所有键
    /// </summary>
    /// <param name="Section">目标段落名称</param>
    public void ClearSection(string Section)
    {
      // 将key设为null仅清空该段下的所有键值对，保留段名结构
      IniWriteValue(Section, null, null);
    }
  }
}