How to add where clause to ThenInclude

Question

I have 3 entities:

Questionnaire.cs:

public class Questionnaire
{
    public int Id { get; set; }
    public string Name { get; set; }
          


        

Answer 1

I think you need to have a navigation property of question in your answer because answer should have an question Id . You have this FK already you just need a nav property

Your model class look like this

public class Answer
{
    public int Id { get; set; }
    public string UserId { get; set; }
    public string TextAnswer { get; set; }
    // added in model
    public Question Question { get; set; }
} 

and query like this

  var answers = ctx.Answers.Include(q=>q.Question).Where(a =>a.UserId=="1").ToList();