Typed steps

You can let nbehave instantiate types for you so you dont have to implement your steps with only primitive data types. The type parameter the step takes must have a default public constructor and the parameters from the text step must be public properties.

Given this step implementation:

[Given("a book with title $title and isbn $isbn")]
public void StepImpl(string title, string isbn)
{ }

You could implement the step with the following code:

[Given("a book with title $title and isbn $isbn")]
public void StepImpl(Book book)
{ }

public class Book
{
  public string Title { get; set; }
  public string Isbn { get; set; }
}

This works for lists too. Example:

Given some books:
  | title | isbn |
  | aaaaa | 1111 |
  | bbbbb | 2222 |

and implement the step like

[Given("some books:")]
public void StepImpl(List<Book> books)
{ }