.Net Core Dto映射(AutoMapper)

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, 上代码

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<Employee, EmployeeDto>()

            .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<ActionResult<EmployeeDto>>

        CreateEmployeeForCompany(Guid companyId, EmployeeAddDto employee)

    {

        if (!await _companyRepository.CompanyExistsAsync(companyId))

        {

            return NotFound();

        }

        var entity = _mapper.Map<Employee>(employee);

        _companyRepository.AddEmployee(companyId, entity);

        await _companyRepository.SaveAsync();

        var dtoToReturn = _mapper.Map<EmployeeDto>(entity);

        return CreatedAtRoute(nameof(GetEmployeeForCompany), new

        {

            companyId = companyId,

            employeeId = dtoToReturn.Id

        }, dtoToReturn);

    }

}

巴特西

.NET Core Dto映射(AutoMapper)

.Net Core Dto映射(AutoMapper)

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