im a bit confused about repository pattern,here i write my code then i explain:
public interface IRepositoryTest<T> where T:class
{
IEnumerable<T> SelectAll(Expression<Func<T, bool>> predicate);
}
here is the implementation of the above signature:
public class RepositoryTest<T>:IRepositoryTest<T> where T:class
{
private CentralEntities db = null;
private DbSet<T> table = null;
public RepositoryTest() {
this.db = new CentralEntities();
table = db.Set<T>();
}
public RepositoryTest(CentralEntities db)
{
this.db = db;
table = db.Set<T>();
}
public IEnumerable<T> SelectAll(Expression<Func<T, bool>> predicate)
{
return table.Where(predicate).ToList();
}
}
now in my controller if i want to use this repository i have to do something like this:
IRepositoryTest<UserRoles> _repository = null;
public DashbrdController(IRepositoryTest<UserRoles> _repository)
{
this._repository = _repository;
}
public DashbrdController()
{
this._repository = new RepositoryTest<UserRoles>();
}
public ActionResult DashBrd()
{
var rslt = _repository.SelectAll(s=>s.user_id=="myName");
return View();
}
the problem here is ,in my controller i can use only one class from my model,as you see its (UserRoles),if i want to add another class to this controller how should i do it?i want to have multiple class to join them,but in the constructor of my controller i can use only one class,where is the problem?
updated:
Add this wapper class
class TransactionManager
{
CentralEntities _ctx;
Hashtable _repositories;
public TransactionManager(CentralEntities ctx)
{
_ctx = ctx;
}
public RepositoryTest<T> CreateRepository<T>() where T : class
{
if (_repositories == null)
_repositories = new Hashtable();
var type = typeof(T).Name;
if (!_repositories.Contains(type))
{
var repositoryType = typeof(RepositoryTest<>);
var repositoryInstance = Activator.CreateInstance(repositoryType.MakeGenericType(typeof(T)), _ctx);
_repositories.Add(type,repositoryInstance);
}
return (RepositoryTest<T>)_repositories[type];
}
public int Save()
{
return _ctx.Save();
}
}
Now in the controller
public class DashbrdController:Controller
{
TransactionManager _tMgr;
public DashbrdController(TransactionManager tMgr)
{
this._tMgr=tMgr;
}
public DashbrdController()
{
this._tMgr=new TransactionManager() ;
}
public ActionResult DashBrd()
{
var rslt = _tMgr.CreateRepository<UserRoles>().SelectAll(s=>s.user_id=="myName");
return View();
}
public ActionResult AnotherDashBrd()
{
var anotherrslt = _tMgr.CreateRepository<AnotherRoles>().SelectAll(s=>s.Name=="myName");
return View();
}
Also, You can check a project with source code regarding the repository pattern
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