asp.net核心读取appsettings on program.cs combine di

Question

我在我的类中读取程序中的配置。它效果很好。

var builder = WebApplication.CreateBuilder(args);

var authSettingsSection = builder.Configuration.GetSection("Auth");
builder.Services.Configure<AuthConfig>(authSettingsSection);
builder.Services.AddAuthorization();
builder.Services.AddAuthentication();
builder.Services.AddControllers();
<...>

但是，然后我需要将AddAuthentication设置添加到程序中，并且需要配置中的值。如何在计划课中获得？我不想写类似的东西：

var key = builder.Configuration.GetValue<string>("MySection:SecretKey");

也就是说，它将是这样的：

var builder = WebApplication.CreateBuilder(args);

var authSettingsSection = builder.Configuration.GetSection("Auth");
builder.Services.Configure<AuthConfig>(authSettingsSection);

var key = builder.Configuration.GetValue<string>("MySection:SecretKey");
var issuer = builder.Configuration.GetValue<string>("MySection:Issuer");
var audience = builder.Configuration.GetValue<string>("MySection:Audience");
// and more...

builder.Services.AddAuthorization();
builder.Services
    .AddAuthentication(opt => {
      opt.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
      opt.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
    })
    .AddJwtBearer(options => {
      options.TokenValidationParameters = new TokenValidationParameters{
          ValidateIssuer = true,
          ValidateAudience = true,
          ValidateLifetime = true,
          ValidateIssuerSigningKey = true,
          ValidIssuer = issuer,
          ValidAudience = audience,
          IssuerSigningKey =
              new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key))};
    });
builder.Services.AddControllers();
<...>

如何直接读取班级的价值观，而无需冗余？