导读 | 我们假设一个场景, 采用EF Core+Web Api, 这时候可能会出现EF Core中的Entity Model和在项目中使用的Model之间对应关系出现偏差, 如果使用属性意一一对应, 不免会有大量的工作量 |
好了,接下来直接上代码来说明。
EntityModels.Employee.cs
public class Employee { public Guid Id { get; set; } public Guid CompanyId { get; set; } public string EmployeeNo { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public Gender Gender { get; set; } public DateTime DateOfBirth { get; set; } public Company Company { get; set; } }
Models.EmployeeDto.cs
public class EmployeeDto { public Guid Id { get; set; } public Guid CompanyId { get; set; } public string EmployeeNo { get; set; } public string Name { get; set; } public string GenderDisplay { get; set; } public int Age { get; set; } }
我们可以观察到, 两个实体之间有很多不同的地方, 比如名字拆分啊, 出生日期和年龄啊等等, 我之前的做法就是硬生生手写代码转换, 但是经过学习大佬们的代码, 发现了一个类库, 在此算是记录一下吧
AutoMapper.Extensions.Microsoft.DependencyInjection
可以通过NuGet安装,使用的时候也非常简单, 建立Profile文件夹, 新建一个EmployeeProfile类, 继承于Profile。
public class EmployeeProfile: Profile { public EmployeeProfile() { CreateMap() .ForMember(dest => dest.Name, opt => opt.MapFrom(src => $"{src.FirstName} {src.LastName}")) .ForMember(dest => dest.GenderDisplay, opt => opt.MapFrom(src => src.Gender.ToString())) .ForMember(dest => dest.Age, opt => opt.MapFrom(src => DateTime.Now.Year - src.DateOfBirth.Year)); } }
在使用的时候只需要这样, 注入mapper, 然后就是很简单的操作了, 简直了, 功能非常强大!!!
[ApiController] [Route("api/companies/{companyId}/employees")] public class EmployeesController: ControllerBase { private readonly IMapper _mapper; private readonly ICompanyRepository _companyRepository; public EmployeesController(IMapper mapper, ICompanyRepository companyRepository) { _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper)); _companyRepository = companyRepository ?? throw new ArgumentNullException(nameof(companyRepository)); } [HttpPost] public async Task> CreateEmployeeForCompany(Guid companyId, EmployeeAddDto employee) { if (!await _companyRepository.CompanyExistsAsync(companyId)) { return NotFound(); } var entity = _mapper.Map (employee); _companyRepository.AddEmployee(companyId, entity); await _companyRepository.SaveAsync(); var dtoToReturn = _mapper.Map (entity); return CreatedAtRoute(nameof(GetEmployeeForCompany), new { companyId = companyId, employeeId = dtoToReturn.Id }, dtoToReturn); } }
原创文章,作者:ItWorker,如若转载,请注明出处:https://blog.ytso.com/123762.html