C# 读取层次化ini配置文件

ConnectionStrings:DefaultConnection=DataSource=app.db;Cache=Shared
Logging:LogLevel:Default=Information
Logging:LogLevel:Microsoft=Warning
Logging:LogLevel:Microsoft.Hosting.Lifetime=Information
AllowedHosts=*

using System;
using System.Collections.Generic;
using System.IO;public class HierarchicalConfig
{// 使用不区分大小写的字典存储键值对private readonly Dictionary<string, string> _values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);/// <summary>/// 从文件加载配置/// </summary>/// <param name="filePath">配置文件路径</param>/// <param name="encoding">文件编码，默认 UTF-8</param>public HierarchicalConfig(string filePath, Encoding encoding = null){if (encoding == null) encoding = Encoding.UTF8;Load(filePath, encoding);}private void Load(string filePath, Encoding encoding){if (!File.Exists(filePath))throw new FileNotFoundException("配置文件不存在", filePath);foreach (string line in File.ReadAllLines(filePath, encoding)){string trimmed = line.Trim();// 忽略空行和注释（支持 # 和 ; 开头的注释）if (string.IsNullOrEmpty(trimmed) || trimmed.StartsWith("#") || trimmed.StartsWith(";"))continue;int equalIndex = trimmed.IndexOf('=');if (equalIndex <= 0) // 没有等号或等号在开头（无效）continue;string key = trimmed.Substring(0, equalIndex).TrimEnd();  // 键，保留原始大小写string value = trimmed.Substring(equalIndex + 1).TrimStart();// 可选：去除值两端的引号（如果值用引号包围）if (value.Length >= 2){if ((value[0] == '"' && value[^1] == '"') || (value[0] == '\'' && value[^1] == '\''))value = value.Substring(1, value.Length - 2);}// 存储完整键路径（保留冒号分隔符）_values[key] = value;}}/// <summary>/// 获取指定键的值/// </summary>/// <param name="keyPath">键路径，如 "Logging:LogLevel:Default"</param>/// <param name="defaultValue">键不存在时返回的默认值</param>public string GetValue(string keyPath, string defaultValue = null){return _values.TryGetValue(keyPath, out string value) ? value : defaultValue;}/// <summary>/// 判断指定键是否存在/// </summary>/// <param name="keyPath">键路径，如 "ConnectionStrings:DefaultConnection"</param>public bool ContainsKey(string keyPath){return _values.ContainsKey(keyPath);}/// <summary>/// 获取所有以某前缀开头的键值对（可用于模拟“节”）/// </summary>/// <param name="prefix">前缀，如 "Logging:"</param>public IEnumerable<KeyValuePair<string, string>> GetValuesWithPrefix(string prefix){foreach (var kv in _values){if (kv.Key.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))yield return kv;}}
}