.NET5修改配置不重启自动生效的实现_实用技巧_

 public static IHostBuilder CreateHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureAppConfiguration((context, config) => { config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true); }) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup(); }); 

 { "TestSetting": "123", "AppOptions": { "UserName": "zhangsan" } } 

 public class HomeController : Controller { 　　　　 private readonly ILogger _logger; private readonly IConfiguration _configuration; public HomeController(ILogger logger, IConfiguration configuration) { _logger = logger; _configuration = configuration; } public IActionResult Index() { string Name = _configuration["TestSetting"]; string Name2 = _configuration["AppOptions:UserName"]; ViewBag.Name = Name; ViewBag.Name2 = Name2; return View(); } } 

 { "TestSetting": "abc", "AppOptions": { "UserName": "zhangsan123" } } 

 /// 
 /// 配置文件 /// 
 public class AppOptions { public string UserName { get; set; } } 

 public void ConfigureServices(IServiceCollection services) { services.AddControllersWithViews(); services.Configure(Configuration.GetSection("AppOptions")); } 

 public class HomeController : Controller { private readonly ILogger _logger; private readonly IConfiguration _configuration; private AppOptions _options; public HomeController(ILogger logger, IConfiguration configuration, IOptionsMonitor appOptions) { _logger = logger; _configuration = configuration; _options = appOptions.CurrentValue; } public IActionResult Index() { string Name = _configuration["TestSetting"]; string Name2 = _options.UserName; ViewBag.Name = Name; ViewBag.Name2 = Name2; return View(); } } 

 //IOptions //站点启动后，获取到的值永远不变 //IOptionsMonitor //站点启动后，如果配置文件有变化会发布事件 （加载配置时，reloadOnChange:true 必须为true） //IOptionsSnapshot //站点启动后，每次获取到的值都是配置文件里的最新值 （加载配置时，reloadOnChange:true 必须为true） 

 public class HomeController : Controller { private readonly ILogger _logger; private UserService _userService; public HomeController(ILogger logger, UserService userService) { _userService = userService; } public IActionResult Index() { string Name2 = _userService.GetName(); ViewBag.Name2 = Name2; return View(); } } 

 public class UserService { private AppOptions _options; public UserService(IOptionsMonitor appOptions) { _options = appOptions.CurrentValue; } public string GetName() { var Name = _options.UserName; return Name; } } 

 public void ConfigureServices(IServiceCollection services) { services.AddControllersWithViews(); services.Configure(Configuration.GetSection("AppOptions")); services.AddSingleton(); }

 public static IHostBuilder CreateHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureAppConfiguration((context, config) => { config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true); config.AddJsonFile("Configs/dbsetting.json", optional: true, reloadOnChange: true); }) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup(); }); 

 public class HomeController : Controller { private readonly ILogger _logger; private readonly IConfiguration _configuration; private AppOptions _options; public HomeController(ILogger logger, IConfiguration configuration, IOptionsMonitor appOptions) { _logger = logger; _configuration = configuration; _options = appOptions.CurrentValue; } public IActionResult Index() { string Name = _configuration["TestSetting"]; string Name2 = _configuration["db:connection1"]; ViewBag.Name = Name; ViewBag.Name2 = Name2; return View(); } }