Module.AdminModules/Server/Startup/ServerStartup.cs

using Microsoft.AspNetCore.Builder; 
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.DependencyInjection;
using Oqtane.Infrastructure;
using System;
using SZUAbsolventenverein.Module.AdminModules.Models;
using SZUAbsolventenverein.Module.AdminModules.Repository;
using SZUAbsolventenverein.Module.AdminModules.Services;
using SZUAbsolventenverein.Module.AdminSettings.Services;

namespace SZUAbsolventenverein.Module.AdminModules.Startup
{
    public class ServerStartup : IServerStartup
    {
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            // not implemented
        }

        public void ConfigureMvc(IMvcBuilder mvcBuilder)
        {
            // not implemented
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddTransient<IAdminModulesService, ServerAdminModulesService>();
            services.AddTransient<IAdminSettingsService, ServerAdminSettingsService>();
            services.AddTransient<IAdminSettingsRepository, AdminSettingsRepository>();
            services.AddDbContextFactory<AdminModulesContext>(opt => { }, ServiceLifetime.Transient);

            services.Configure<DataProtectionTokenProviderOptions>(options =>
            {
                options.TokenLifespan = TimeSpan.FromDays(2);
            });

            try
            {
                AdminSetting settings = AdminSettingsExtensions.LoadSettings();
                services.Configure<DataProtectionTokenProviderOptions>(options =>
                {
                    options.TokenLifespan = TimeSpan.FromDays(settings.TokenLifetime);
                });
                Console.WriteLine("Saving token lifetime: " + settings.TokenLifetime + " days");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        }
    }
}