AutoMapper 4.2 and Ninject 3.2

问题:

I'm updating a project of mine to use AutoMapper 4.2, and I'm running into breaking changes. While I seem to have resolved said changes, I'm not entirely convinced I've done so in the most appropriate way.

In the old code, I have a NinjectConfiguration, and an AutoMapperConfiguration class that are each loaded by WebActivator. In the new version the AutoMapperConfiguration drops out and I instead instance a MapperConfiguration directly in the NinjectConfiguration class where the bindings are happening, like so:

private static void RegisterServices(     IKernel kernel) {     var profiles = AssemblyHelper.GetTypesInheriting<Profile>(Assembly.Load("???.Mappings")).Select(Activator.CreateInstance).Cast<Profile>();     var config = new MapperConfiguration(         c => {             foreach (var profile in profiles) {                 c.AddProfile(profile);             }         });      kernel.Bind<MapperConfiguration>().ToMethod(         c =>             config).InSingletonScope();      kernel.Bind<IMapper>().ToMethod(         c =>             config.CreateMapper()).InRequestScope();      RegisterModules(kernel); } 

So, is this the appropriate way of binding AutoMapper 4.2 using Ninject? It seems to be working so far, but I just want to make sure.

回答1:

In before IMapper interface didn't existed in the library so you had to implement interface and class below and bound them as a singleton pattern.

public interface IMapper {     T Map<T>(object objectToMap); }  public class AutoMapperAdapter : IMapper {     public T Map<T>(object objectToMap)     {         //Mapper.Map is a static method of the library!         return Mapper.Map<T>(objectToMap);     } } 

Now you simply bind library's IMapper interface to single instance of mapperConfiguration.CreateMapper()

The Problem with your code tho, you should use a single instance(or as Ninject says, a constant) bind.

// A reminder var config = new MapperConfiguration(     c => {         foreach (var profile in profiles) {             c.AddProfile(profile);         }     }); // Solution starts here var mapper = config.CreateMapper(); kernel.Bind<IMapper>().ToConstant(mapper); 

文章来源: AutoMapper 4.2 and Ninject 3.2