Set up Automapper in ASP.NET Core
Add the main AutoMapper Package to your solution via NuGet.
Add the AutoMapper Dependency Injection Package to your solution via NuGet.
Create a new class for a mapping profile. (I made a class in the main solution directory called MappingProfile.cs and add the following code.) I’ll use a User and UserDto object as an example.
public class MappingProfile : Profile {
public MappingProfile() {
// Add as many of these lines as you need to map your objects
CreateMap<User, UserDto>();
CreateMap<UserDto, User>();
}
}
Then add the AutoMapperConfiguration in the Startup.cs as shown below:
public void ConfigureServices(IServiceCollection services) {
// .... Ignore code before this
// Auto Mapper Configurations
var mapperConfig = new MapperConfiguration(mc =>
{
mc.AddProfile(new MappingProfile());
});
IMapper mapper = mapperConfig.CreateMapper();
services.AddSingleton(mapper);
services.AddMvc();
}
To invoke the mapped object in code, do something like the following:
public class UserController : Controller {
// Create a field to store the mapper object
private readonly IMapper _mapper;
// Assign the object in the constructor for dependency injection
public UserController(IMapper mapper) {
_mapper = mapper;
}
public async Task<IActionResult> Edit(string id) {
// Instantiate source object
// (Get it from the database or whatever your code calls for)
var user = await _context.Users
.SingleOrDefaultAsync(u => u.Id == id);
// Instantiate the mapped data transfer object
// using the mapper you stored in the private field.
// The type of the source object is the first type argument
// and the type of the destination is the second.
// Pass the source object you just instantiated above
// as the argument to the _mapper.Map<>() method.
var model = _mapper.Map<UserDto>(user);
// .... Do whatever you want after that!
}
}
References
https://stackoverflow.com/questions/40275195/how-to-set-up-automapper-in-asp-net-core