重构项目结构，移除Assignment相关功能，优化Submission模块

TechHelper.Server/Services/ExamType/ExamTypeService.cs

@@ -0,0 +1,175 @@
+using AutoMapper;
+using Entities.Contracts;
+using Entities.DTO;
+using Microsoft.EntityFrameworkCore;
+using SharedDATA.Api;
+using TechHelper.Services.Beta;
+
+namespace TechHelper.Services.Beta
+{
+    public class ExamTypeService : IExamTypeService
+    {
+        private readonly IUnitOfWork _work;
+        private readonly IMapper _mapper;
+
+        public ExamTypeService(IUnitOfWork work, IMapper mapper)
+        {
+            _work = work;
+            _mapper = mapper;
+        }
+
+        public async Task<ApiResponse> GetAllAsync(QueryParameter query)
+        {
+            try
+            {
+                var repository = _work.GetRepository<ExamType>();
+
+                if (query.Search != null && !string.IsNullOrWhiteSpace(query.Search))
+                {
+                    var examTypes = await repository.GetPagedListAsync(
+                        predicate: et => et.Name.Contains(query.Search) || et.Description.Contains(query.Search),
+                        pageSize: query.PageSize,
+                        pageIndex: query.PageIndex
+                    );
+                    var examTypeDtosFiltered = _mapper.Map<IEnumerable<TypeCommonDto>>(examTypes.Items);
+                    return new ApiResponse(true, examTypeDtosFiltered);
+                }
+                else
+                {
+                    var examTypes = await repository.GetPagedListAsync(
+                        pageSize: query.PageSize,
+                        pageIndex: query.PageIndex,
+                        include: i => i.Include(et => et.Exams)
+                    );
+                    var examTypeDtos = _mapper.Map<IEnumerable<TypeCommonDto>>(examTypes.Items);
+                    return new ApiResponse(true, examTypeDtos);
+                }
+            }
+            catch (Exception ex)
+            {
+                return new ApiResponse($"获取所有考试类型时发生错误: {ex.Message}");
+            }
+        }
+
+        public async Task<ApiResponse> GetAsync(Guid id)
+        {
+            try
+            {
+                var examType = await _work.GetRepository<ExamType>().GetFirstOrDefaultAsync(
+                    predicate: et => et.Id == id,
+                    include: i => i
+                        .Include(et => et.Exams));
+
+                if (examType == null)
+                {
+                    return new ApiResponse("考试类型未找到。");
+                }
+
+                var examTypeDto = _mapper.Map<ExamTypeResponseDto>(examType);
+                return new ApiResponse(true, examTypeDto);
+            }
+            catch (Exception ex)
+            {
+                return new ApiResponse($"获取考试类型时发生错误: {ex.Message}");
+            }
+        }
+
+        public async Task<ApiResponse> AddAsync(ExamTypeDto model)
+        {
+            try
+            {
+                // 检查是否已存在同名考试类型
+                var existingExamType = await _work.GetRepository<ExamType>().GetFirstOrDefaultAsync(
+                    predicate: et => et.Name == model.Name);
+
+                if (existingExamType != null)
+                {
+                    return new ApiResponse($"考试类型 '{model.Name}' 已存在。");
+                }
+
+                var examType = _mapper.Map<ExamType>(model);
+                await _work.GetRepository<ExamType>().InsertAsync(examType);
+
+                if (await _work.SaveChangesAsync() > 0)
+                {
+                    return new ApiResponse(true, examType.Id);
+                }
+                return new ApiResponse("添加考试类型失败。");
+            }
+            catch (Exception ex)
+            {
+                return new ApiResponse($"添加考试类型时发生错误: {ex.Message}");
+            }
+        }
+
+        public async Task<ApiResponse> UpdateAsync(ExamTypeDto model)
+        {
+            try
+            {
+                var existingExamType = await _work.GetRepository<ExamType>().GetFirstOrDefaultAsync(
+                    predicate: et => et.Id == model.Id);
+
+                if (existingExamType == null)
+                {
+                    return new ApiResponse("考试类型未找到。");
+                }
+
+                // 检查是否要修改为已存在的考试类型名称（排除当前考试类型）
+                var examTypeWithSameName = await _work.GetRepository<ExamType>().GetFirstOrDefaultAsync(
+                    predicate: et => et.Name == model.Name && et.Id != model.Id);
+
+                if (examTypeWithSameName != null)
+                {
+                    return new ApiResponse($"考试类型名称 '{model.Name}' 已被其他考试类型使用。");
+                }
+
+                _mapper.Map(model, existingExamType);
+                _work.GetRepository<ExamType>().Update(existingExamType);
+
+                if (await _work.SaveChangesAsync() > 0)
+                {
+                    var examTypeDto = _mapper.Map<ExamTypeResponseDto>(existingExamType);
+                    return new ApiResponse(true, examTypeDto);
+                }
+                return new ApiResponse("更新考试类型失败。");
+            }
+            catch (Exception ex)
+            {
+                return new ApiResponse($"更新考试类型时发生错误: {ex.Message}");
+            }
+        }
+
+        public async Task<ApiResponse> DeleteAsync(Guid id)
+        {
+            try
+            {
+                var existingExamType = await _work.GetRepository<ExamType>().GetFirstOrDefaultAsync(
+                    predicate: et => et.Id == id,
+                    include: i => i.Include(et => et.Exams));
+
+                if (existingExamType == null)
+                {
+                    return new ApiResponse("考试类型未找到。");
+                }
+
+                // 检查是否有关联的考试
+                if (existingExamType.Exams != null && existingExamType.Exams.Any())
+                {
+                    return new ApiResponse("无法删除该考试类型，因为存在关联的考试。");
+                }
+
+                _work.GetRepository<ExamType>().Delete(existingExamType);
+
+                if (await _work.SaveChangesAsync() > 0)
+                {
+                    return new ApiResponse(true, "考试类型删除成功。");
+                }
+                return new ApiResponse("删除考试类型失败。");
+            }
+            catch (Exception ex)
+            {
+                return new ApiResponse($"删除考试类型时发生错误: {ex.Message}");
+            }
+        }
+    }
+}

TechHelper.Server/Services/ExamType/IExamTypeService.cs

@@ -0,0 +1,9 @@
+using Entities.DTO;
+using TechHelper.Services;
+
+namespace TechHelper.Services.Beta
+{
+    public interface IExamTypeService : IBaseService<ExamTypeDto, Guid>
+    {
+    }
+}