ASP.Net MVC How to work with multiple repositories

Tridip Bhattacharjee

8y2.9k.NET

i am working with asp.net mvc 5 project. suppose i showing studen registration form where i have few textbox where student will fill their name and address details. also select his country and also select his hobbies etc.

so countries will be coming from country repository, hobbies will be coming from hobby repository.

so if i inject one repository in controller by manually or by automatically using unity DI then how it will be possible for me to call data from multiple repositories ?

please guide me how to design and handle this situation. thanks

4 Replies

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Tridip Bhattacharjee8y ago
Thanks for reply.

Now i understand how to do it when working with multiple repositories and Unity DI.
here is a small code snippet of my understanding.
public class FooController : Controller
{
    readonly IFooRepository _repository;
    readonly IOtherRepository _otherRepository;

    public ProductController(IFooRepository repository, IOtherRepository otherRepository)
    {
        _repository = repository;
        _otherRepository = otherRepository;
    }
}
Shweta Lodha8y ago
In case of dependency injection via Controller, you have to pass all your interfaces(dependencies) as a parameter to you. Are you facing any challenge in passing those?
Tridip Bhattacharjee8y ago
Hello Madam,

sorry to say i asked different question. often people inject repository via constructor of controller in asp.net mvc. see this link https://forums.asp.net/t/2105895.aspx?Repository+inject+into+controller+by+Unity+DI

here i refer this code
public class FooController : Controller
{
     readonly IFooRepository _repository;

     // Inject here
     public ProductController(IFooRepository repository)
     {
           _repository = repository;
     }

     // Use it here
     public ActionResult Bar()
     {
          var bar = _repository.DoSomething();
     }
}
some where in project relation has been mention by unity between IFooRepository & FooRepository. so in this case unity DI will inject the repository in product controller at runtime.
my question is when we are working with multiple repository from controller then how this kind of approach called repository injection by unity will help me?

we often need to work with multiple repository with asp.net mvc project. so how could i overcome the multiple repository injection issue with unity DI?

or do i need to follow different approach other than injection repository by UNITY DI.

looking for your further suggestion and guide line. thanks
Shweta Lodha8y ago
Hi Tridip,
In Controller method you can do something like:
public ActionResult PopulateData()
{
    ViewData["Countries"] = _repositoryc.GetCountries();
    ViewData["Hobbies"] = _repository.GetHobbies();
    return View();
}
And in view you can do something like:
             "country" class="myStyle">

                @foreach (var item in ViewData["Countries"]
                as List )
                {


                }


Similarly you cna do for hobbies, etc.
Hope this makes sense.