adding a constructor to our generated code

gistfile1.rb

def add_constructor 
    arg_name = "repo"
    # Create the constructor's object
    ctor = CodeConstructor.new
    ctor.Attributes = MemberAttributes.Public
    ctor.Parameters.Add(CodeParameterDeclarationExpression.new("IRepository", arg_name))

    # Grab the references for both the parameter we just added and the field we created
    # earlier
    arg_ref  = CodeArgumentReferenceExpression.new(arg_name) 
    repo_ref = CodeFieldReferenceExpression.new
    repo_ref.FieldName = @repo_field_name
   
    # Creating the condition statement for the  if/else that will wrap our assignment statement
    condition_statement = CodeSnippetExpression.new("#{arg_name} != null")
    # Create the statement that will be used when the condition statement is true
    assign_statement = CodeAssignStatement.new(repo_ref, arg_ref)

    ctor.Statements.Add(create_if_else_statement(condition_statement, assign_statement,@arg_null_exception_stmt))
    @target_class.Members.Add(ctor)
  end