Question

I am trying to define an interface and classes which implement the interface as below. The method defined in the interface accepts a string as argument where myClass2 implementation of the method Execute takes 2 arguments which doesn’t follow the interface definition.

That’s the problem. How could I define a method within an interface which takes n number of parameters of various type?

Please advice. Thanks.

public interface MyInterface
{
     void Execute(string a);
}

public class myClass1 : MyInterface
{
     public void Execute(string a)
     {
        Console.WriteLine(a);
     }
}

public class myClass2 : MyInterface
{
     public void Execute(string a, int b)
     {
          Console.WriteLine(a);
          Console.WriteLine(b.ToString());
     }

}

EDIT: I am thinking of another approach. I appreciate if someone could tell me if this will be a better design.

public interface IParameter
{
    Type ParameterType { get; set; }
    string Name { get; set; }
    object Value { get; set; }
}

public interface MyInterface 
{
     void Execute(Recordset recordSet, List<IParameter> listParams);
}

public class MyClass : MyInterface
{
      public void Execute(Recordset recordSet, List<IParameter> listParams)
      {

      }
}

I am passing a list of IParameter which holds all the required parameters which need to be sent.

Answer 1

How would the caller know how to call the method, if the interface didn’t fix the parameter types?

The closest you can can would be:

public interface MyInterface
{
     void Execute(params object[] args);
}

Implementations of the interface would have to then deal with any number of arguments being passed in though – you couldn’t have an implementation which only handled a single int parameter, although it could of course throw an exception if args contains anything other than a single int value.

EDIT: Just to be clear, this would rarely be a good design. In some very weakly typed scenarios it may be appropriate, but otherwise, usually it would be worth trying to find something better.

If you can give more information about what you’re trying to do, we may be able to help you more.