.Net Core 中选项Options的具体实现_实用技巧_

 public class UserOptions { private string instanceId; private static int index = 0; public UserOptions() { instanceId = (++index).ToString("00"); Console.WriteLine($"Create UserOptions Instance:{instanceId}"); } public string Name { get; set; } public int Age { get; set; } public override string ToString() => $"Name:{Name} Age:{Age} Instance:{instanceId} "; } public class UserOptions2 { public string Name { get; set; } public int Age { get; set; } public override string ToString() => $" Name:{Name} Age:{Age}"; } 

 { "UserOption": { "Name": "ConfigName-zhangsan", "Age": 666 } } 

 services = new ServiceCollection(); var configBuilder = new ConfigurationBuilder().AddInMemoryCollection().AddJsonFile("myconfig.json", true, true); var iconfiguration = configBuilder.Build(); services.AddSingleton(iconfiguration); 

 services.Configure(x => { x.Name = "张三"; x.Age = new Random().Next(1, 10000); }); services.AddOptions().Configure((x, config) => { x.Name = config["UserOption:Name"]; x.Age = 100; }); ; services.PostConfigure(x => { x.Name = x.Name + "Post"; x.Age = x.Age; }); services.Configure("default", x => { x.Name = "Default-张三"; x.Age = new Random().Next(1, 10000); }); services.Configure("config", configuration.GetSection("UserOption")); using (var provider = services.BuildServiceProvider()) { using (var scope1 = provider.CreateScope()) { PrintOptions(scope1, "Scope1"); } //修改配置文件 Console.WriteLine(string.Empty); Console.WriteLine("修改配置文件"); var filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "myconfig.json"); File.WriteAllText(filePath, "{\"UserOption\": { \"Name\": \"ConfigName-lisi\", \"Age\": 777}}"); //配置文件的change回调事件需要一定时间执行 Thread.Sleep(300); Console.WriteLine(string.Empty); using (var scope2 = provider.CreateScope()) { PrintOptions(scope2, "Scope2"); } Console.WriteLine(string.Empty); using (var scope3 = provider.CreateScope()) { PrintOptions(scope3, "Scope3"); } } static void PrintOptions(IServiceScope scope, string scopeName) { var options1 = scope.ServiceProvider.GetService>(); Console.WriteLine($"手动注入读取,IOptions,{scopeName}-----{ options1.Value}"); var options2 = scope.ServiceProvider.GetService>(); Console.WriteLine($"配置文件读取,IOptionsSnapshot,{scopeName}-----{ options2.Value}"); var options3 = scope.ServiceProvider.GetService>(); Console.WriteLine($"配置文件根据名称读取,IOptionsSnapshot,{scopeName}-----{ options3.Get("config")}"); var options4 = scope.ServiceProvider.GetService>(); Console.WriteLine($"配置文件读取,IOptionsMonitor,{scopeName}-----{ options4.CurrentValue}"); var options5 = scope.ServiceProvider.GetService>(); Console.WriteLine($"配置文件根据名称读取,IOptionsMonitor,{scopeName}-----{options5.Get("config")}"); var options6 = scope.ServiceProvider.GetService>(); Console.WriteLine($"Options2-----{options6.Value}"); } 

 public static IServiceCollection Configure(this IServiceCollection services, Action configureOptions) where TOptions : class { return services.Configure(Microsoft.Extensions.Options.Options.DefaultName, configureOptions); } public static IServiceCollection Configure(this IServiceCollection services, string name, Action configureOptions) where TOptions : class { services.AddOptions(); services.AddSingleton((IConfigureOptions)new ConfigureNamedOptions(name, configureOptions)); return services; } public static IServiceCollection AddOptions(this IServiceCollection services) { services.TryAdd(ServiceDescriptor.Singleton(typeof(IOptions<>), typeof(OptionsManager<>))); services.TryAdd(ServiceDescriptor.Scoped(typeof(IOptionsSnapshot<>), typeof(OptionsManager<>))); services.TryAdd(ServiceDescriptor.Singleton(typeof(IOptionsMonitor<>), typeof(OptionsMonitor<>))); services.TryAdd(ServiceDescriptor.Transient(typeof(IOptionsFactory<>), typeof(OptionsFactory<>))); services.TryAdd(ServiceDescriptor.Singleton(typeof(IOptionsMonitorCache<>), typeof(OptionsCache<>))); return services; } 

 public ConfigureNamedOptions(string name, Action action) { Name = name; Action = action; } 

 private readonly ConcurrentDictionary> _cache = new ConcurrentDictionary>(StringComparer.Ordinal); public TOptions Value => Get(Options.DefaultName); public virtual TOptions Get(string name) { name = name ?? Options.DefaultName; return _cache.GetOrAdd(name, () => _factory.Create(name)); } 

 public OptionsFactory(IEnumerable> setups, IEnumerable> postConfigures) { _setups = setups; _postConfigures = postConfigures; } 

 public TOptions Create(string name) { //首先创建对应Options的实例 TOptions val 
                
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