[DllImport("kernel32")]
private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
[DllImport("kernel32")]
private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);

上面的代码是读文件和写文件，写文件逻辑为判断路径是否存在，如果不存在，创建文件并写入

 

调用示例

WritePrivateProfileString(section, key, val, Application.StartupPath + @"\setting.ini");

GetPrivateProfileString(section, key, "", temp, 10000, Application.StartupPath + @"\setting.ini");