Example of the AutoMapper injection method in. NET Core, coreautomapper

Example of the AutoMapper injection method in. NET Core, coreautomapper

This article mainly introduces the dependency injection of AutoMapper in. NET Core and shares the content for your reference. I will not talk about it much below. Let's take a look at the detailed introduction:

Recently, in the review code, I found that my colleagues did not use the Code as they did in other projects.AutoMapper.Mapper.Initialize()The static method configures the ing, but uses the dependency injection IMapper interface.

services.AddSingleton<IMapper>(new Mapper(new MapperConfiguration(cfg =>{ cfg.CreateMap<User, MentionUserDto>();})));

So I took the opportunity to learn about it and found AutoMapper. Extensions. Microsoft. DependencyInjection on github.AutoMapper.ProfileConfigure ing

public class MappingProfile : Profile{ public MappingProfile() {  CreateMap<User, MentionUserDto>(); }}

ThenAddAutoMapper()Dependency injection, which automatically finds all subclasses inherited from the Profile in the current Assembly and adds them to the configuration.

services.AddAutoMapper();

When projectid is used

.Take(10).ProjectTo<MentionUserDto>().ToListAsync(); 

If you useAddSingleton<IMapper>(), The following error occurs (For details, refer to the FAQ ):

Mapper not initialized. Call Initialize with appropriate configuration.

UseAddAutoMapper()The same problem occurs when UseStaticRegistration is set to false.

The solution is to pass parameters to projectid._mapper.ConfigurationProvider (Note:The parameter _ mapper is invalid)

.ProjectTo<MentionUserDto>(_mapper.ConfigurationProvider)

For the method of self-dependent injection, referAutoMapper.Extensions.Microsoft.DependencyInjection Implementation

services.AddSingleton(config);return services.AddScoped<IMapper>(sp => new Mapper(sp.GetRequiredService<IConfigurationProvider>(), sp.GetService));

The following method is used. If you do not want to useAddAutoMapper() Profile is automatically located through reflection. This method is recommended.

AutoMapper.IConfigurationProvider config = new MapperConfiguration(cfg =>{ cfg.AddProfile<MappingProfile>();});services.AddSingleton(config);services.AddScoped<IMapper, Mapper>();

Summary

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