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?

Answer 1

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.