Error on initializing AutoMapper v6 in ASP.NET MVC App

Question

var config = new MapperConfiguration(cfg =>
    {
         cfg.CreateMap<SomeSourceModel, SomeDestinationModel>();
    });

 config.AssertConfigurationIsValid();
 var mapper = config.CreateMapper();

I am repeating these code in the project. Thinking to create a common interface IMapper so that I can invoke whenever it is needed to be used.

The solution I create is

    private IMapper Mapper(TSource source, TDestination dest)
    {
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<source, dest>();
        });

        config.AssertConfigurationIsValid();

        return  config.CreateMapper();
    }

It doesn't work. The problem is I can't pass source model and destination model as parameters in this way. How to solve this?

Update 1:

As @12seconds mentioned, I start initializing MapperConfigration in Global.asax.cs

In App_Start folder, I created

public class MappingProfile : Profile
{
    public MappingProfile()
    {
        CreateMap<SourceModel1, DestinationModel1>();
        CreateMap<SourceModel2, DestinationModel2>();
        CreateMap<SourceModel3, DestinationModel3>();
        CreateMap<SourceModel4, DestinationModel4>();
        CreateMap<SourceModel5, DestinationModel5>();

        Mapper.AssertConfigurationIsValid();
    }

}

In Global.asax.cs

    public class AutoMapperConfiguration
    {
        public static void Configure()
        {
            Mapper.Initialize(x =>
            {
                x.AddProfile<MappingProfile>();
            });
        }
    }

And then I tried to call AutoMapperConfiguration.Configure(); in several places. When I start running the App, I got same error messages:

Mapper not initialized. Call Initialize with appropriate configuration. If you are trying to use mapper instances through a container or otherwise, make sure you do not have any calls to the static Mapper.Map methods, and if you're using ProjectTo or UseAsDataSource extension methods, make sure you pass in the appropriate IConfigurationProvider instance.

Where I suppose to call AutoMapperConfiguration.Configure();? Did I miss something?

Answer 1

The problem solved. Mapper.AssertConfigurationIsValid(); should be executed after Mapper initialized.

public class AutoMapperConfiguration
{
    public static void Configure()
    {
        Mapper.Initialize(x =>
        {
            x.AddProfile<MappingProfile>();
        });

        Mapper.Configuration.AssertConfigurationIsValid();               
    }
}