c# - 访问 Controller 类中的 appsettings.json 值

Question

无法弄清楚如何读取 startup.cs 之外的 appsettings.json 值。我想做的是，例如，在 _Layout.cshtml 中，从配置中添加站点名称:

例如:

ViewData["SiteName"] = Configuration.GetValue<string>("SiteSettings:SiteName");

或者更好:

public class GlobalVars {
    public static string SiteName => Configuration.GetValue<string>("SiteSettings:SiteName");
}

到目前为止，这是我的代码:

[应用设置.json]

"SiteSettings": {
    "SiteName": "MySiteName"
}

[启动.cs]

public Startup(IHostingEnvironment env)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
        .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
        .AddEnvironmentVariables();
    Configuration = builder.Build();

    var siteName = Configuration.GetValue<string>("SiteSettings:SiteName");
}

public IConfigurationRoot Configuration { get; }

也许我读错了文档，但我似乎无法在 Startup 类之外公开 Configuration 对象。

Answer 1

在你的 Startup.cs 中

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddSingleton<IConfiguration>(Configuration);
    }

然后在你的 Controller 中:

public class ValuesController : Controller
{
    IConfiguration configuration;

    public ValuesController(IConfiguration configuration)
    {
        this.configuration = configuration;
    }
}