c# - 访问 startup.cs 中的 appsetting.json 值

Question

我了解如何为 appsettings.json 配置服务并将它们注入(inject) Controller 。但是，我需要在配置 Auth 时使用 ConfigureServices 中的值。我该怎么做？请参阅下面的示例。特别是这一行:

option.clientId = /*Need client Id from appsettings.json*/

代码:

public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            services.Configure<AADSettings>(Configuration.GetSection("AADSettings"));
            services.Configure<APISettings>(Configuration.GetSection("APISettings"));

            // Add Authentication services.
            services.AddAuthentication(sharedOptions =>
            {
                sharedOptions.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                sharedOptions.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
            })
                // Configure the OWIN pipeline to use cookie auth.
                .AddCookie()
                // Configure the OWIN pipeline to use OpenID Connect auth.
                .AddOpenIdConnect(option =>
                {
                    option.clientId = /*Need client Id from appsettings.json*/

                    option.Events = new OpenIdConnectEvents
                    {
                        OnRemoteFailure = OnAuthenticationFailed,
                    };
                });
        }

Answer 1

您可以像这样访问此 ConfigureServices 方法

var config = Configuration.GetSection("AADSettings").Get<AADSettings>();
option.clientId = config.ClientId;

要使上述代码正常工作，您需要将 ClientId 作为属性的名为 AADSettings 的 POCO 类

public class AADSettings
{
 public string ClientId { get; set; }
}

在 appsettings.json 文件中，你需要有这样的条目

"AADSettings": {
    "ClientId": "Client1",
}