ECMJobRunner/ECMJobRunner.Application/DependencyInjection.cs

using ECMJobRunner.Application.Behaviors;
using MediatR;
using Microsoft.Extensions.DependencyInjection;
using System.Reflection;

namespace ECMJobRunner.Application
{
    /// <summary>
    /// Extension methods for configuring Application layer services
    /// </summary>
    public static class DependencyInjection
    {
        /// <summary>
        /// Adds Application layer services to the dependency injection container
        /// Registers MediatR, pipeline behaviors, and AutoMapper
        /// </summary>
        /// <param name="services">The service collection</param>
        /// <returns>The service collection for chaining</returns>
        public static IServiceCollection AddApplication(this IServiceCollection services)
        {
            var assembly = Assembly.GetExecutingAssembly();

            // Register MediatR with all handlers from this assembly
#if NET48
            services.AddMediatR(assembly);
#else
            services.AddMediatR(cfg => cfg.RegisterServicesFromAssembly(assembly));
#endif

            // Register pipeline behaviors in execution order
            // Order matters: MainQuery -> CheckQuery -> ReCRequest
            services.AddTransient(typeof(IPipelineBehavior<,>), typeof(MainQueryExecutionBehavior<,>));
            services.AddTransient(typeof(IPipelineBehavior<,>), typeof(CheckQueryExecutionBehavior<,>));
            services.AddTransient(typeof(IPipelineBehavior<,>), typeof(ReCRequestExecutionBehavior<,>));

            return services;
        }
    }
}