How to implement Unity DI for my scenario to load class dynamically

Question

I want to load my class dynamically by using the Unity DI container based on country code saved in variable.

Our win apps has a shipping functionality for which we use web service developed by 3rd party company like UPS, FedEx and Purolator.

Now how should I design my code with unity, so that I could load my shipping class based on country code stored in variable?

Suppose this is my sample or proposed class design:

   public interface IShip
    {
        string Ship();
    }

    public class UPS : IShip
    {
        public string Ship()
        {
        }
    }

    public class FedEX : IShip
    {
        public string Ship()
        {
        }

    }

    public class Purolator : IShip
    {
        public string Ship()
        {
        }

    }

How can I use unity to load class based on variable value.

What if GB is stored in variable and I want to load UPS class and invoke ship function ?

Suppose FR is stored in a variable and I want to load UPS class and invoke ship function ?

Suppose if US is stored in variable and I want to load FedEx class and invoke ship function ?

Suppose CA is stored in variable and I want to load Purolator class and invoke ship function ?

the class design from my thought. code not started. i like to know how to use unity DI which load class dynamically based on country code supplied at run time. — Thomas, Mar 21 '16 at 19:07
Use Named registration of multiple implementation with interface. Similar [answer here](http://stackoverflow.com/a/23669951/881798). — vendettamit, Mar 21 '16 at 21:00

Backs · Answer 1 · 2016-08-01T02:14:47.073

2

You can register your classes by name, and resolve them depending on your condition:

container.RegisterType<IShip, UPS>("UPS");
container.RegisterType<IShip, FedEX>("FedEX");
container.RegisterType<IShip, Purolator>("Purolator");

public IShip GetShippment(string c)
{

    if (c == "GB" || c == "FR")
        return container.Resolve<IShip>("UPS");

    if (c == "US")
        return container.Resolve<IShip>("FedEX");

    if (c == "CA")
        return container.Resolve<IShip>("Purolator");

    throw new NotImplementedException();
}
...
var shippment = GetShippment("CA");
shippment.Ship();

edited Aug 01 '16 at 02:14

answered Mar 23 '16 at 03:59

Backs

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thanks for your code but u did not show how to call right ship function........would u plzz add bit more code to show how to call ship function ? thanks – Thomas Mar 23 '16 at 08:03
@Thomas just call method `Ship` – Backs Mar 23 '16 at 08:10
i will test your code and let u know. thanks a lot :) – Thomas Mar 23 '16 at 08:11

How to implement Unity DI for my scenario to load class dynamically

1 Answers1