.NET6 ConfigurationManager的实现及使用方式_实用技巧_

 ConfigurationManager configurationManager = new(); configurationManager.AddJsonFile("appsettings.json",true,reloadOnChange:true); string serviceName = configurationManager["ServiceName"]; Console.WriteLine(serviceName); 

 IConfigurationBuilder configurationBuilder = new ConfigurationBuilder().AddJsonFile("appsettings.json"); IConfiguration configuration = configurationBuilder.Build(); string serviceName = configuration["ServiceName"]; Console.WriteLine(serviceName); 

 public ConfigurationManager Configuration { get; } = new(); //这里注册为了单例模式 Services.AddSingleton(_ => Configuration); 

 public sealed class ConfigurationManager : IConfigurationBuilder, IConfigurationRoot, IDisposable { } 

 ConfigurationManager configurationManager = new(); IConfigurationBuilder configurationBuilder = configurationManager.AddJsonFile("appsettings.json", true, reloadOnChange: true); //尽管放心的调用Build完全不影响啥 IConfiguration configuration = configurationBuilder.Build(); string serviceName = configuration["ServiceName"]; Console.WriteLine(serviceName); 

 public class ConfigurationBuilder : IConfigurationBuilder { /// 
 /// 添加的数据源被存放到了这里 /// 
 public IList Sources { get; } = new List(); public IDictionary Properties { get; } = new Dictionary(); /// 
 /// 添加IConfigurationSource数据源 /// 
 ///  public IConfigurationBuilder Add(IConfigurationSource source) { if (source == null) { throw new ArgumentNullException(nameof(source)); } Sources.Add(source); return this; } public IConfigurationRoot Build() { //获取所有添加的IConfigurationSource里的IConfigurationProvider var providers = new List(); foreach (var source in Sources) { var provider = source.Build(this); providers.Add(provider); } //用providers去实例化ConfigurationRoot return new ConfigurationRoot(providers); } } 

 private readonly ConfigurationSources _sources = new ConfigurationSources(this); ; IConfigurationBuilder IConfigurationBuilder.Add(IConfigurationSource source) { _sources.Add(source ?? throw new ArgumentNullException(nameof(source))); return this; } 

 /// 
 /// 本身是一个IConfigurationSource集合 /// 
 private class ConfigurationSources : IList { private readonly List _sources = new(); private readonly ConfigurationManager _config; /// 
 /// 因为是ConfigurationManager的内部类所以传递了当前ConfigurationManager实例 /// 
 ///  public ConfigurationSources(ConfigurationManager config) { _config = config; } /// 
 /// 根据索引获取其中一个IConfigurationSource实例 /// 
 ///  public IConfigurationSource this[int index] { get => _sources[index]; set { _sources[index] = value; _config.ReloadSources(); } } public int Count => _sources.Count; public bool IsReadOnly => false; /// 
 /// 这是重点添加配置源 /// 
 ///  public void Add(IConfigurationSource source) { //给自己的IConfigurationSource集合添加 _sources.Add(source); //调用了ConfigurationManager的AddSource方法 _config.AddSource(source); } /// 
 /// 实现IList清除操作 /// 
 public void Clear() { _sources.Clear(); //这里可以看到ConfigurationManager的ReloadSources方法很重要 //通过名字可以看出是刷新配置数据用的 _config.ReloadSources(); } public void Insert(int index, IConfigurationSource source) { _sources.Insert(index, source); _config.ReloadSources(); } public bool Remove(IConfigurationSource source) { var removed = _sources.Remove(source); _config.ReloadSources(); return removed; } public void RemoveAt(int index) { _sources.RemoveAt(index); _config.ReloadSources(); } //这里省略了实现了实现IList接口的其他操作 //ConfigurationSources本身就是IList } 

 private readonly object _providerLock = new(); private readonly List _providers = new(); private readonly List _changeTokenRegistrations = new(); private void AddSource(IConfigurationSource source) { lock (_providerLock) { //在IConfigurationSource中得到IConfigurationProvider实例 var provider = source.Build(this); //添加到_providers集合中 //我们提到过从配置源得到的配置都是通过IConfigurationProvider得到的 _providers.Add(provider); //IConfigurationProvider的Load方法是从配置源中得到配置数据加载到程序内存中 provider.Load(); //注册更改令牌操作,使得配置可以进行动态刷新加载 _changeTokenRegistrations.Add(ChangeToken.OnChange(() => provider.GetReloadToken(), () => RaiseChanged())); } //添加新的配置源要刷新令牌操作 RaiseChanged(); } private ConfigurationReloadToken _changeToken = new(); private void RaiseChanged() { //每次对配置源进行更改操作需要得到新的更改令牌实例，用于可重复通知配置变更相关 var previousToken = Interlocked.Exchange(ref _changeToken, new ConfigurationReloadToken()); previousToken.OnReload(); } 

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