在C#中，可以使用System.IO命名空间下的StreamReader和StreamWriter类来读写INI文件。以下是一个简单的示例代码：

using System;using System.IO;public class IniFile{private string filePath;public IniFile(string filePath){this.filePath = filePath;}public string ReadValue(string section, string key){string value = "";using (StreamReader sr = new StreamReader(filePath)){string line;while ((line = sr.ReadLine()) != null){if (line.StartsWith($"[{section}]")){while ((line = sr.ReadLine()) != null){if (line.StartsWith(key)){value = line.Split('=')[1].Trim();break;}}break;}}}return value;}public void WriteValue(string section, string key, string value){bool sectionExists = false;string tempFile = Path.GetTempFileName();using (StreamReader sr = new StreamReader(filePath))using (StreamWriter sw = new StreamWriter(tempFile)){string line;while ((line = sr.ReadLine()) != null){if (line.StartsWith($"[{section}]")){sectionExists = true;}sw.WriteLine(line);}if (!sectionExists){sw.WriteLine($"[{section}]");}sw.WriteLine($"{key}={value}");}File.Delete(filePath);File.Move(tempFile, filePath);}}// 使用示例IniFile ini = new IniFile("example.ini");ini.WriteValue("Section1", "Key1", "Value1");string value = ini.ReadValue("Section1", "Key1");Console.WriteLine(value);

在以上示例中，IniFile类封装了读取和写入INI文件的方法。通过ReadValue方法可以读取指定section和key对应的值，通过WriteValue方法可以写入指定section和key对应的值。