对于键控服务的一次简单封装

注：该写法仅适用于 .NET 8 及以上

public static class ServiceCollectionExtensions
{
    public static void AddServices<TBase>(this IServiceCollection services, ServiceLifetime lifetime = ServiceLifetime.Transient, Assembly? assembly = null)
    {
        assembly ??= typeof(TBase).Assembly;

        var types = assembly.GetTypes()
                            .Where(t => typeof(TBase).IsAssignableFrom(t) && t.IsClass && !t.IsAbstract)
                            .ToList();

        foreach (var type in types)
        {
            string? key = type.FullName;

            if (string.IsNullOrWhiteSpace(key))
            {
                continue;
            }

            switch (lifetime)
            {
                case ServiceLifetime.Scoped:
                    services.AddScoped(typeof(TBase), type);
                    break;
                case ServiceLifetime.Singleton:
                    services.AddSingleton(typeof(TBase), type);
                    break;
                case ServiceLifetime.Transient:
                default:
                    services.AddTransient(typeof(TBase), type);
                    break;
            }
        }
    }
}

// 很适合策略模式~

builder.Services.AddServices<AStrategy>(ServiceLifetime.Transient);
builder.Services.AddServices<BStrategy>(ServiceLifetime.Transient);
builder.Services.AddServices<CStrategy>(ServiceLifetime.Transient);