Constructor abstract class

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Constructor abstract class

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#1 by (2 votes)

2

I'm not able to develop the following environment:

public abstract class AplicacaoGenerica<TEntity> where TEntity : class
{
    private IRepositorio<TEntity> repositorio;
    public AplicacaoGenerica(IRepositorio<TEntity> repo)
    {
        repositorio = repo;
    }

      (...)
}

There is no error in this class.

public class BandeiraAplicacao : AplicacaoGenerica<Bandeira>
{

}

In this class the following error appears:

Does not contain a constructor that takes 0 arguments

public class BandeiraAplicacaoConstrutor
{
    public static BandeiraAplicacao BandeiraAplicacaoEF()
    {
        return new BandeiraAplicacao(new BandeiraRepositorioEF());
    }
}

Displays the following error:

Does not contain a constructor that takes 1 arguments

I have an abstract class, GeneralApplication, which has a constructor. Then I create a BandeiraApplication class that implements GeneralApplication. Then the Flag Class Application Builder tries to call the Flag builder Application.

c# .net asp.net-mvc

asked by anonymous 09.09.2014 / 16:09

1 answer

Modal window with database contents Group keys in an array

score 2 · Accepted Answer

You have to create a constructor with the same structure in sub class , something like this:

public class BandeiraAplicacao : AplicacaoGenerica<Bandeira>
{
     public BandeiraAplicacao(IRepositorio<TEntity> repo)
         // aqui estamos passando o argumento para a sub class 
         :base(repo)
     {
     }
}

The error you pointed out is saying that% base% has no empty constructor, for class class use in its construction.

So you have two options to solve this problem:

Pass the required parameter to% base_database in the child constructor (as in the example);

Create an empty constructor in BandeiraAplicacao base