WebAPI学习(九)：AutoMapper的使用

AutoMapper是一种实体转换关系的模型，AutoMapper是一个.NET的对象映射工具。主要作用是进行领域对象与模型（DTO）之间的转换、数据库查询结果映射至实体对象。

1. 在TEST.API.Services项目中引用Nuget包，AutoMapper

   

2. 在Entity中新增StudentDto.cs

   public class StudentDto
   {
       /// <summary>
       /// ID
       /// </summary>
       public int ID { get; set; }
   
       /// <summary>
       /// 姓名
       /// </summary>
       public string Name { get; set; }
   
       /// <summary>
       /// 年龄
       /// </summary>
       public int? Age { get; set; }
   
       /// <summary>
       /// 生日
       /// </summary>
       public string Birthday {  get; set; }
   
       /// <summary>
       /// 手机
       /// </summary>
       public string Phone {  get; set; }
   
       /// <summary>
       /// 地址
       /// </summary>
       public string Address {  get; set; }
   }

3. 添加映射文件 CustomProfile.cs

   public class CustomProfile : Profile
    {
        /// <summary>
        /// 构造函数
        /// </summary>
        public CustomProfile()
        {
            CreateMap<Student, StudentDto>();
        }
    }

4. 在program.cs中注入服务：

   //注入AutoMapper
   builder.Services.AddAutoMapper(typeof(CustomProfile));

5. IStudentService中新增接口：

   /// <summary>
   /// 获取学生详情
   /// </summary>
   /// <param name="id"></param>
   /// <returns></returns>
   Task<StudentDto> GetStudentDetails(int id);

6. StudentService新增方法，将Student对象转化成模型

   /// <summary>
   /// 测试autoMapper
   /// </summary>
   /// <param name="id"></param>
   /// <returns></returns>
   public async Task<StudentDto> GetStudentDetails(int id)
   {
       var student = await _studentRepository.QueryByID(id);
       if (student != null)
       {
           StudentDto dto = _mapper.Map<StudentDto>(student);
           dto.Birthday = "1992-2-2";
           dto.Address = "测试地址信息";
           dto.Phone = "18888888888";
           return dto;
       }
       else
       {
           return null;
       }
   }

7. StudentController新增接口测试AutoMapper：

   [HttpPost]
   [AllowAnonymous]
   public async Task<IActionResult> GetStudentDetails(int id)
   {
       var student = await stuService.GetStudentDetails(id);
       if (student == null) 
       {
           return NotFound();
       }
   
       return Ok(student);
   }