NBuilder parameterless constructor error

Question

We are using NBuilder for generating test data for our tests. We have a few models with private setters. So setting thos properties is only possible throughout the constructor. The problem is that we get the following error from NBuilder:

CompanyAddressViewModel does not have a default parameterless constructor

I understand the error. Do I really need to create a default constructor in my class?

Here is my NBuilder code:

Builder<CompanyAddressViewModel>.CreateNew().Build()

Same issue. For example Newtonsoft.Json is able to instantiate classes without default constructors. This feature would be really helpful in NBuilder too. — neleus, Apr 19 '17 at 13:19

Alejandro Pena Sánchez · Answer 1 · 2018-08-27T08:10:04.963

3

You can use WithConstructor() or WithFactory() method, in Net Core 2.1 WithConstructor() method is deprecated.

Builder<CompanyAddressViewModel>.CreateNew(). WithFactory (() => new parameter()).Build()

edited Aug 27 '18 at 08:10

answered Aug 27 '18 at 08:04

Alejandro Pena Sánchez

31
4

score 1 · Answer 2 · answered Jun 02 '20 at 08:47

Former versions uses WithConstructor() method, but it's obsolete in these days, so you should use WithFactory() method:

Builder<CompanyAddressViewModel>
         .CreateNew()
         .WithFactory(() => new CompanyAddressViewModel("your", "parameter"))
         .Build()

score 0 · Answer 3 · answered Sep 22 '17 at 00:08

0

You need to use With method.

Builder<CompanyAddressViewModel>
               .CreateNew()
               .With(() => new CompanyAddressViewModel(...))
               .Build()

answered Sep 22 '17 at 00:08

monica85rodrigues

1
1

NBuilder parameterless constructor error

3 Answers3