MireaBackend/Application/DependencyInjection.cs

using FluentValidation;
using MediatR;
using Microsoft.Extensions.DependencyInjection;
using Mirea.Api.DataAccess.Application.Common.Behaviors;
using System.Reflection;

namespace Mirea.Api.DataAccess.Application;

public static class DependencyInjection
{
    public static IServiceCollection AddApplication(this IServiceCollection services)
    {
        services.AddMediatR(cfg => cfg.RegisterServicesFromAssembly(Assembly.GetExecutingAssembly()));
        services.AddValidatorsFromAssemblies(new[] { Assembly.GetExecutingAssembly() });
        services.AddTransient(typeof(IPipelineBehavior<,>),
            typeof(ValidationBehavior<,>));
        return services;
    }
}