c# constructor overloading

Question

I created the following constructors for my class:

public class AccountService : IAccountService
{

    public AccountService(Meta meta)
    {
        Initialize(meta.DataSourceID);
    }

    public AccountService(string dataSourceID)
    {
        Initialize(dataSourceID);
    }

However when I call the class:

_accountService = new AccountService(vm.Meta);

I get the following message:

Error 16 The best overloaded method match for 'AccountService.AccountService(string)' has some invalid arguments

Is there something basic that I am missing here? When coding intellisense gives me the two options and there's no syntax error when I use intellisense to select vm.Meta? Do I need to declare constructors in the interface?

What is the type of vm.Meta. If vm is an instance of Meta then pass vm instead of vm.Meta. — KV Prajapati
– KV Prajapati, Commented Dec 14, 2011 at 2:55
You in fact cannot declare constructors in the interface as a constructor is considered an implementation detail. — Gary.S
– Gary.S, Commented Dec 14, 2011 at 2:55
The type of vm.Meta is Meta. Actually I tried something else. I completely removed the constructor and then let VS2010 generate a method stub. On compilation that still gives me the error. I'm even more confused now. — Samantha J T Star
– Samantha J T Star, Commented Dec 14, 2011 at 3:01
All is ok. I couldn´t see anything wrong so I tried it and it compiles well. — lontivero
– lontivero, Commented Dec 14, 2011 at 3:07

Adam Rackis · Accepted Answer · 2011-12-14 03:04:28Z

2

Do I need to declare constructors in the interface?

No. You cannot decalre constructors in an interface. Interfaces represent a declaration of your type's public api; they do not in any way specify how implementing classes are created

The code you have is correct, conceptually at least; the problem is likely that vm.Meta is not of type Meta, or a type that inherits from Meta.

answered Dec 14, 2011 at 3:04

Adam Rackis

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