ASP.NETCore2.2：无法解析类型为'AutoMapper.IMapper'的服务

You will have to use automapper package as shown below:

Install-Package AutoMapper.Extensions.Microsoft.DependencyInjection

This will also in turn install the Automapper nuget package if you don’t have it already.

Then, inside your ConfigureServices method of your startup.cs, you will have to add a call to it as shown below.

public void ConfigureServices(IServiceCollection services)
{
    services.AddAutoMapper();
}

Refer this blog for more details.

EDIT:

There is very nice description from this thread.

You need to add code like below in startup.cs.

You have missed to add IMapper in DI. Please refer add Singleton call from below code.

public void ConfigureServices(IServiceCollection services) {
    // .... Ignore code before this

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

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

    services.AddMvc();

}