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MyNewProjectName.Application/DependencyInjection.cs

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+using System.Reflection;
+using FluentValidation;
+using MediatR;
+using Microsoft.Extensions.DependencyInjection;
+using MyNewProjectName.Application.Behaviors;
+
+namespace MyNewProjectName.Application;
+
+/// <summary>
+/// Dependency Injection for Application Layer
+/// </summary>
+public static class DependencyInjection
+{
+    public static IServiceCollection AddApplication(this IServiceCollection services)
+    {
+        var assembly = Assembly.GetExecutingAssembly();
+
+        // Register AutoMapper
+        services.AddAutoMapper(assembly);
+
+        // Register MediatR
+        services.AddMediatR(cfg =>
+        {
+            cfg.RegisterServicesFromAssembly(assembly);
+            // Logging phải đứng đầu tiên để ghi nhận request đến
+            cfg.AddBehavior(typeof(IPipelineBehavior<,>), typeof(LoggingBehavior<,>));
+            // Sau đó mới đến Validation
+            cfg.AddBehavior(typeof(IPipelineBehavior<,>), typeof(ValidationBehavior<,>));
+        });
+
+        // Register FluentValidation validators
+        services.AddValidatorsFromAssembly(assembly);
+
+        return services;
+    }
+}