如何在 ASP.NET Core 2.2 API 中使用 Automapper

Question

这是我得到的错误：

System.InvalidOperationException：尝试激活“myBackEnd.Controllers.StripeController”时无法解析“myBackEnd.Entities.Striper”类型的服务。 在 Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)

我正在第一次使用 Automapper。 我也是 NET 的新手。 我正在使用 HTTPPOST 从前端以格式获取数据

    amount :  string;
    currency :  string;
    description :  string;
    token :  string;
    name: string;
    address_city: string;
    address_line1: string;
    address_line2: string;
    address_state: string;
    address_zip: string;
    address_country: string;

我有 stripe.cs 和 stripeDto.cs 文件：

public class Striper
{
    public object Amount { get; set; }
    public string Currency { get; set; }
    public object Description { get; set; }
    public string Token { get; set; }
    public string Name { get; set; }
    public string Address_line1 { get; set; }
    public string Address_line2 { get; set; }
    public string Address_state { get; set; }
    public string Address_zip { get; set; }
    public string Address_country { get; set; }
}

条纹：

public class StripeDto
{
    public object Amount { get; set; }
    public string Currency { get; set; }
    public object Description { get; set; }
    public string Token { get; set; }
    public string Name { get; set; }
    public string Address_line1 { get; set; }
    public string Address_line2 { get; set; }
    public string Address_state { get; set; }
    public string Address_zip { get; set; }
    public string Address_country { get; set; }
}

这是映射配置文件：

public class MappingProfile : Profile
{
    public MappingProfile()
    {
        CreateMap<Striper, StripeDto>();
        CreateMap<StripeDto, Striper>();
    }
}

最后这是控制器：

private readonly AppDbContext _context;
private IMapper _mapper;

public StripeController(AppDbContext context, IMapper mapper)
{
     _context = context;
     _mapper = mapper;
}

public async Task<IActionResult> PostCreditCardData([FromBody] StripeDto stripeDto)
{
        Console.WriteLine("got this from the front end", stripeDto);
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

          _context.StripeDto.Add(stripeDto);
         // Instantiate source object stripe
         await _context.SaveChangesAsync();

        _striper = _mapper.Map<Striper>(stripeDto);
        return Ok(_striper);


 }

我在 Visual Studio 中收到此错误“无法解析‘myBackEnd.Entities.Striper’类型的服务”

这是startup.cs代码：

services.AddAutoMapper();

Answer 1

首先，您必须安装 Automapper 依赖注入包：

安装包 AutoMapper.Extensions.Microsoft.DependencyInjection

在 Startup 类的 ConfigureServices 方法中调用 services.AddAutoMapper()。

有关更多信息，请访问： https : //dotnetcoretutorials.com/2017/09/23/using-automapper-asp-net-core/

Answer 2

您在Startup类中的AutoMapper配置应如下所示：

public void ConfigureServices(IServiceCollection services)
{

    // Auto Mapper Configurations
    var mappingConfig = new MapperConfiguration(mc =>
    {
        mc.AddProfile(new MappingProfile());
    });

    IMapper mapper = mappingConfig.CreateMapper();
    services.AddSingleton(mapper);

    //........
}

Answer 3

我知道为时已晚

但这是因为您的启动和 AutoMapper 配置

services.AddAutoMapper(typeof(MappingProfile).Assembly);

此致