新增 Service 層以處理業務邏輯

在 `Program.cs` 中註冊 `IRoleService` 和 `IDepartmentService` 的相依性注入。
新增 `DepartmentService` 和 `RoleService` 類別，實作相應的介面，並提供取得所有處室及身份資料的功能，使用 AutoMapper 進行物件映射。
定義 `IDepartmentService` 和 `IRoleService` 介面，包含 `GetAllAsync` 方法以取得資料 DTO 集合。

XisongSpaceBooking_BackEnd/Program.cs

@@ -2,6 +2,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.OpenApi.Models;
 using XisongSpaceBooking_BackEnd.Configurations;
 using XisongSpaceBooking_BackEnd.Repositories;
+using XisongSpaceBooking_BackEnd.Services;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -17,6 +18,10 @@ builder.Services.AddAutoMapper(cfg =>
 builder.Services.AddScoped<IRoleRepository, RoleRepository>();
 builder.Services.AddScoped<IDepartmentRepository, DepartmentRepository>();
 
+// µù¥U Service ªA°È
+builder.Services.AddScoped<IRoleService, RoleService>();
+builder.Services.AddScoped<IDepartmentService, DepartmentService>();
+
 // °t¸m Entity Framework »P³s½u¦À
 builder.Services.AddDbContextPool<SpaceBookingDbContext>(options =>
 {

XisongSpaceBooking_BackEnd/Services/DepartmentService.cs

@@ -0,0 +1,36 @@
+using AutoMapper;
+using XisongSpaceBooking_BackEnd.Models.DTOs;
+using XisongSpaceBooking_BackEnd.Repositories;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// 處室業務邏輯實作
+    /// </summary>
+    public class DepartmentService : IDepartmentService
+    {
+        private readonly IDepartmentRepository _departmentRepository;
+        private readonly IMapper _mapper;
+
+        /// <summary>
+        /// 建構函式
+        /// </summary>
+        /// <param name="departmentRepository">處室資料存取</param>
+        /// <param name="mapper">物件映射器</param>
+        public DepartmentService(IDepartmentRepository departmentRepository, IMapper mapper)
+        {
+            _departmentRepository = departmentRepository ?? throw new ArgumentNullException(nameof(departmentRepository));
+            _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
+        }
+
+        /// <summary>
+        /// 取得所有處室資料
+        /// </summary>
+        /// <returns>所有處室 DTO 的集合</returns>
+        public async Task<IEnumerable<DepartmentDto>> GetAllAsync()
+        {
+            var departments = await _departmentRepository.GetAllAsync();
+            return _mapper.Map<IEnumerable<DepartmentDto>>(departments);
+        }
+    }
+}

XisongSpaceBooking_BackEnd/Services/IDepartmentService.cs

@@ -0,0 +1,16 @@
+using XisongSpaceBooking_BackEnd.Models.DTOs;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// 處室業務邏輯介面
+    /// </summary>
+    public interface IDepartmentService
+    {
+        /// <summary>
+        /// 取得所有處室資料
+        /// </summary>
+        /// <returns>所有處室 DTO 的集合</returns>
+        Task<IEnumerable<DepartmentDto>> GetAllAsync();
+    }
+}

XisongSpaceBooking_BackEnd/Services/IRoleService.cs

@@ -0,0 +1,16 @@
+using XisongSpaceBooking_BackEnd.Models.DTOs;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// 身份業務邏輯介面
+    /// </summary>
+    public interface IRoleService
+    {
+        /// <summary>
+        /// 取得所有身份資料
+        /// </summary>
+        /// <returns>所有身份 DTO 的集合</returns>
+        Task<IEnumerable<RoleDto>> GetAllAsync();
+    }
+}

XisongSpaceBooking_BackEnd/Services/RoleService.cs

@@ -0,0 +1,36 @@
+using AutoMapper;
+using XisongSpaceBooking_BackEnd.Models.DTOs;
+using XisongSpaceBooking_BackEnd.Repositories;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// 身份業務邏輯實作
+    /// </summary>
+    public class RoleService : IRoleService
+    {
+        private readonly IRoleRepository _roleRepository;
+        private readonly IMapper _mapper;
+
+        /// <summary>
+        /// 建構函式
+        /// </summary>
+        /// <param name="roleRepository">身份資料存取</param>
+        /// <param name="mapper">物件映射器</param>
+        public RoleService(IRoleRepository roleRepository, IMapper mapper)
+        {
+            _roleRepository = roleRepository ?? throw new ArgumentNullException(nameof(roleRepository));
+            _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
+        }
+
+        /// <summary>
+        /// 取得所有身份資料
+        /// </summary>
+        /// <returns>所有身份 DTO 的集合</returns>
+        public async Task<IEnumerable<RoleDto>> GetAllAsync()
+        {
+            var roles = await _roleRepository.GetAllAsync();
+            return _mapper.Map<IEnumerable<RoleDto>>(roles);
+        }
+    }
+}