我已经在文件appsettings / Config .json中设置了我的AppSettings数据,如下所示:
I have set up my AppSettings data in file appsettings/Config .json like this:
{ "AppSettings": { "token": "1234" } }我已经在网上搜索了如何从.json文件中读取AppSettings值的信息,但没有得到任何有用的信息。
I have searched online on how to read AppSettings values from .json file, but I could not get anything useful.
我尝试过:
var configuration = new Configuration(); var appSettings = configuration.Get("AppSettings"); // null var token = configuration.Get("token"); // null我知道使用ASP.NET 4.0可以做到:
I know with ASP.NET 4.0 you can do this:
System.Configuration.ConfigurationManager.AppSettings["token"];但是如何在ASP.NET Core中做到这一点?
But how do I do this in ASP.NET Core?
推荐答案这有些曲折。我已修改此答案以使其与 ASP.NET Core 2.0 保持最新(截至2018年2月26日)。
This has had a few twists and turns. I've modified this answer to be up to date with ASP.NET Core 2.0 (as of 26/02/2018).
此大部分取自官方文档:
要使用ASP.NET应用程序中的设置,建议仅在应用程序的中实例化配置启动类。然后,使用选项模式访问各个设置。假设我们有一个 appsettings.json 文件,如下所示:
To work with settings in your ASP.NET application, it is recommended that you only instantiate a Configuration in your application’s Startup class. Then, use the Options pattern to access individual settings. Let's say we have an appsettings.json file that looks like this:
{ "MyConfig": { "ApplicationName": "MyApp", "Version": "1.0.0" } }我们有一个表示配置的POCO对象:
And we have a POCO object representing the configuration:
public class MyConfig { public string ApplicationName { get; set; } public int Version { get; set; } }现在我们在 Startup.cs中构建配置:
public class Startup { public IConfigurationRoot Configuration { get; set; } public Startup(IHostingEnvironment env) { var builder = new ConfigurationBuilder() .SetBasePath(env.ContentRootPath) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true); Configuration = builder.Build(); } }请注意, appsettings.json 将在.NET Core 2.0中默认注册。如果需要,我们还可以注册 appsettings。{Environment} .json 每个环境的配置文件。
Note that appsettings.json will be registered by default in .NET Core 2.0. We can also register an appsettings.{Environment}.json config file per environment if needed.
如果需要要将配置注入到控制器中,我们需要在运行时注册它。我们通过 Startup.ConfigureServices :
If we want to inject our configuration to our controllers, we'll need to register it with the runtime. We do so via Startup.ConfigureServices:
public void ConfigureServices(IServiceCollection services) { services.AddMvc(); // Add functionality to inject IOptions<T> services.AddOptions(); // Add our Config object so it can be injected services.Configure<MyConfig>(Configuration.GetSection("MyConfig")); }我们像这样注入它:
public class HomeController : Controller { private readonly IOptions<MyConfig> config; public HomeController(IOptions<MyConfig> config) { this.config = config; } // GET: /<controller>/ public IActionResult Index() => View(config.Value); }完整的启动类:
public class Startup { public IConfigurationRoot Configuration { get; set; } public Startup(IHostingEnvironment env) { var builder = new ConfigurationBuilder() .SetBasePath(env.ContentRootPath) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true); Configuration = builder.Build(); } public void ConfigureServices(IServiceCollection services) { services.AddMvc(); // Add functionality to inject IOptions<T> services.AddOptions(); // Add our Config object so it can be injected services.Configure<MyConfig>(Configuration.GetSection("MyConfig")); } }更多推荐
如何从ASP.NET Core中的.json文件读取AppSettings值
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