I have been mapping my repository class to its interface and same goes for services. Here I could manually register them. But I would like my code to dynamically map these in run time so that I don't have to manually register them every time I create a new repository or service. How can I achieve that?
Here's my code:
public void RegisterDependencies(IServiceCollection services, IConectionSetting connectionSetting)
{
services.AddDbContext<QuantumDbContext>(options => options.UseSqlServer(connectionSetting.Get()));
//services.AddDbContext<TestDbContext>(options => options.UseSqlServer(databaseFactory.ConnectionString));
services.AddTransient<IDatabaseFactory, DatabaseFactory>();
services.AddTransient<IDbContext, TestDbContext>();
services.AddTransient<IDbContext, QuantumDbContext>();
services.AddTransient<IUnitOfWorkManager, UnitOfWorkManager>();
services.AddTransient<IRepository<CodeTable>, Repository<CodeTable>>();
services.AddTransient<IRepository<Country>, Repository<Country>>();
services.AddTransient<IRepository<State>, Repository<State>>();
services.AddTransient<IRepository<City>, Repository<City>>();
services.AddTransient<ICodeTableService, CodeTableService>();
services.AddTransient<ICountryService, CountryService>();
}
Let me split your question into two question:
1- How to register and resolve generic types in asp.net core with built-in DI library?
(see vNext Dependency Injection Generic Interface)
services.AddTransient<IRepository<CodeTable>, Repository<CodeTable>>();
services.AddTransient<IRepository<Country>, Repository<Country>>();
services.AddTransient<IRepository<State>, Repository<State>>();
You can simply register repositories like this:
services.AddTransient(typeof(IRepository<>), typeof(Repository<>));
2- How to implement batch registration(convention based) in asp.net core with built-in DI library? (see Convention based binding in ASP.NET 5 / MVC 6 )
services.AddTransient<ICodeTableService, CodeTableService>();
services.AddTransient<ICountryService, CountryService>();
I use following code to implement batch registration and it works as expected but i am not sure if it is good way(there may be wrong code in this implementation):
// i assume your service interfaces inherit from IService
Assembly ass = typeof(ICodeTableService).GetTypeInfo().Assembly;
// get all concrete types which implements IService
var allServices = ass.GetTypes().Where(t =>
t.GetTypeInfo().IsClass &&
!t.GetTypeInfo().IsAbstract &&
typeof(IService).IsAssignableFrom(t));
foreach (var type in allServices)
{
var allInterfaces = type.GetInterfaces();
var mainInterfaces = allInterfaces.Except
(allInterfaces.SelectMany(t => t.GetInterfaces()));
foreach(var itype in mainInterfaces)
{
if (allServices.Any(x => !x.Equals(type) && itype.IsAssignableFrom(x)))
{
throw new Exception("The " + itype.Name + " type has more than one implementations, please change your filter");
}
services.AddTransient(itype, type);
}
}
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