Module.PremiumArea/Client/Startup/ClientStartup.cs

using Microsoft.Extensions.DependencyInjection;
using System.Linq;
using Oqtane.Services;
using SZUAbsolventenverein.Module.PremiumArea.Services;

namespace SZUAbsolventenverein.Module.PremiumArea.Startup
{
    public class ClientStartup : IClientStartup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            if (!services.Any(s => s.ServiceType == typeof(IPremiumAreaService)))
            {
                services.AddScoped<IPremiumAreaService, PremiumAreaService>();
            }
            if (!services.Any(s => s.ServiceType == typeof(IEngineerApplicationService)))
            {
                services.AddScoped<IEngineerApplicationService, EngineerApplicationService>();
            }
            if (!services.Any(s => s.ServiceType == typeof(IUserContactService)))
            {
                services.AddScoped<IUserContactService, UserContactService>();
            }
        }
    }
}