Question

I’m getting this error at running time:

Exception Details: System.InvalidOperationException: Unhandled binding type: ListBinding

• Choice_A, _b,_C are strings
• ‘Choices’ is List

---

  var qs = (from questions in dc.Survey_Questions
                      where questions.Survey_ID == surveyid                     
                      select new SQuestions
                      {
                          QuestionID = questions.Question_ID,                          
                          Description = questions.Description,
                          Choice_A = questions.Choice_A,  
                          Choice_B = questions.Choice_B,  
                          Choice_C = questions.Choice_C,
                         **Choices =  {questions.Choice_A, questions.Choice_B,
          questions.Choice_C}**
   }).ToList();

Basically I’d like to know how I assign to List Choices values of Choice_A,Choice_B, Choice_C.
Thanks in advance.

Answer 1

You can try this. If you already have the following two classes

public class Question
{
    public int Question_ID { get; set; }
    public int Survey_ID { get; set; }

    public String Description { get; set; }
    public String Choice_A { get; set; }
    public String Choice_B { get; set; }
    public String Choice_C { get; set; }
}

public class SQuestions
{
    public int QuestionID { get; set; }
    public String Description { get; set; }
    public String Choice_A { get; set; }
    public String Choice_B { get; set; }
    public String Choice_C { get; set; }

    public List<String> Choices { get; set; }
}

Then the LINQ Query will be

var qs = (from question in dc.Survey_Questions
where question.Survey_ID == surveyid
select new SQuestions
{
   QuestionID = question.Question_ID,
   Description = question.Description,
   Choice_A = question.Choice_A,
   Choice_B = question.Choice_B,
   Choice_C = question.Choice_C,
   Choices = new List<string>(new String[] { question.Choice_A,question.Choice_B, question.Choice_C })
}).ToList();