Cannot implicitly convert type 'System.Linq.IQueryable' to 'System.Collections.Generic.IList'

Question

I have a method:

public DzieckoAndOpiekunCollection GetChildAndOpiekunByFirstnameLastname(string firstname, string lastname)
{
    DataTransfer.ChargeInSchoo         


        

Answer 1

SonarQube reported Return an empty collection instead of null. and I had a problem with the error with casting as in the title of this question. I was able to get rid of both only using return XYZ.ToList().AsQueryable(); in a method with IQueryable like so:

public IQueryable MethodName (...) {
  IQueryable XYZ;
  ...
  return XYZ.ToList().AsQueryable();
}

Hope so it helps for those in a similar scenario(s).