There are different kinds of operation methods:

To create a constructor, first, add a normal method, then change the operationKind to constructor.

In generated code, you will get this:

public partial class Class1
{
  [UmlElement(Id = "c8111515-b7a5-4b9b-87f9-4a19261c8bd8")]
  public Class1(Class2 aClass2)
  {
  }
}

Normally, when doing a constructor for "live" objects, you will want to send in IEcoServiceProvider and call the main constructor we provide like this:

public Class1(IEcoServiceProvider serviceProvider, Class2 aClass2): this(serviceProvider)
{
}