感谢@Kirk指出我不应该认为它是.NET Core 2.0！
您不需要IConfiguration在Startup构造函数中新建。它的实现将由DI系统注入。
// Program.cs
public class Program
{
public static void Main(string[] args)
{
BuildWebHost(args).Run();
}
public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.Build();
}
// Startup.cs
public class Startup
{
public IHostingEnvironment HostingEnvironment { get; private set; }
public IConfiguration Configuration { get; private set; }
public Startup(IConfiguration configuration, IHostingEnvironment env)
{
this.HostingEnvironment = env;
this.Configuration = configuration;
}
}
您需要告诉Startup加载appsettings文件。
// Program.cs
public class Program
{
public static void Main(string[] args)
{
var host = new WebHostBuilder()
.UseKestrel()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseIISIntegration()
.UseStartup<Startup>()
.UseApplicationInsights()
.Build();
host.Run();
}
}
//Startup.cs
public class Startup
{
public IConfigurationRoot Configuration { get; private set; }
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
this.Configuration = builder.Build();
}
...
}
假设您的appsettings.json样子是这样的：
{
"ConnectionStrings": {
...
},
"AppIdentitySettings": {
"User": {
"RequireUniqueEmail": true
},
"Password": {
"requiredLength": 6,
"RequireLowercase": true,
"RequireUppercase": true,
"requiredigit": true,
"RequireNonAlphanumeric": true
},
"Lockout": {
"AllowedForNewUsers": true,
"DefaultLockoutTimeSpanInMins": 30,
"MaxFailedAccessAttempts": 5
}
},
"Recaptcha": {
...
},
...
}
您可以将整个配置注入到控制器/类的构造函数中（通过IConfiguration），并使用指定的键获取所需的值：
public class AccountController : Controller
{
private readonly IConfiguration _config;
public AccountController(IConfiguration config)
{
_config = config;
}
[AllowAnonymous]
public IActionResult ResetPassword(int userId, string code)
{
var vm = new ResetPasswordviewmodel
{
PasswordrequiredLength = _config.GetValue<int>(
"AppIdentitySettings:Password:requiredLength"),
RequireUppercase = _config.GetValue<bool>(
"AppIdentitySettings:Password:RequireUppercase")
};
return View(vm);
}
}
的ConfigurationBuilder.GetValue<T>，如果你只需要从应用程序设置一个或两个值的伟大工程。但是，如果您想从应用程序设置中获取多个值，或者不想在多个位置对这些键字符串进行硬编码，则使用Options Pattern 可能会更容易。选项模式使用类来表示层次结构/结构。
要使用选项模式：
602392714
清零编程群