我正面临一个场景,我需要从asp.net核心DI容器注入一个服务到使用automapper创建的对象的构造函数 .
我不知道这是不是最好的做法,但让我解释一下我想要完成的事情 .
我有一个asp.net核心mvc控制器,它接收一个模型参数,只是一个POCO,该模型需要转换为一个ViewModel类,其中包含一些业务逻辑,数据访问等,在该类对象中我想得到一些信息从注入的服务,这是我遇到问题的部分,无法弄清楚如何从控制器注入服务到最终的ViewModel .
我此时的代码看起来像这样 .
NewGameModel.cs
namespace MyProject.Shared.Models
{
public class NewGameModel
{
public List<PlayerModel> Players { get; set; }
public bool IsValid => Players.Any();
public NewGameModel()
{
Players = new List<PlayerModel>();
}
}
}
NewGameViewModel.cs
namespace MyProject.Core.ViewModels
{
public class NewGameViewModel
{
private Guid Token = Guid.NewGuid();
private DateTime DateTimeStarted = DateTime.Now;
private readonly IConfiguration _configuration;
public List<PlayerModel> Players { get; set; }
public NewGameViewModel(IConfiguration config)
{
_configuration = config;
}
public string DoSomething()
{
//Do something using _configuration
//Business Logic, Data Access etc
}
}
}
MapperProfile.cs
namespace MyProject.Service
{
public class MapperProfile : Profile
{
public MapperProfile()
{
CreateMap<NewGameModel, NewGameViewModel>();
}
}
}
ASP.NET Core project - Startup.cs
namespace MyProject.Service
{
public class Startup
{
public IConfiguration Configuration { get; }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
services.AddSingleton(Configuration);
var autoMapperConfig = new MapperConfiguration(cfg =>
{
cfg.AddProfile(new MapperProfile());
});
var mapper = autoMapperConfig.CreateMapper();
services.AddSingleton(mapper);
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseMvc();
}
}
}
ASP.NET Core project - GameController.cs
namespace MyProject.Service.Controllers
{
[Route("api/[controller]")]
public class GameController : Controller
{
private readonly IConfiguration _configuration;
private readonly IMapper _mapper;
public GameController(IConfiguration config, IMapper mapper)
{
_configuration = config;
_mapper = mapper;
}
[HttpPost]
public IActionResult CreateNewGame([FromBody]NewGameModel model)
{
if (!model.IsValid) return BadRequest();
//Throws error because no constructor parameter was passed
//How to pass the IConfiguration to the destination NewGameViewModel object?
var viewModel = _mapper.Map<NewGameModel, NewGameViewModel>(model);
var result = viewModel.DoSomething();
return CreatedAtRoute("GetGame", new { token = result.GameToken }, result);
}
}
}
我将感谢你的帮助
2 回答
更新配置文件以将配置作为注入的依赖项,并在创建映射时使用
ConstructUsing
.对于稍后出现的人,上述方法不是优选的,因为它具有状态内部配置文件 . 相反,使用
AutoMapper.Extensions.Microsoft.DependencyInjection
包并在您的启动内:然后在您的配置文件中,告诉AutoMapper您希望使用容器构建目标对象:
然后您的控制器可以依赖于
IMapper
,AutoMapper将使用DI容器来构建视图模型,而您对ASP.NET Core的配置将只是services.AddAutoMapper();
的一行