Answer by Kenneth for how to convert list to IEnumerable?

The problem here isn't that you need to convert from List to IEnumerable.

The problem is that you're trying to convert from List<tblSoftwareImageTestPlan> to IEnumerable<SoftwareImageTestPlan>

Those are two completely different types, because of the type argument.

Possible solutions:

• Change the return type to IEnumerable<tblSoftwareImageTestPlan>

• Map the objects to SoftwareImageTestPlan by projecting the tblSoftwareImageTestPlan to a SoftwareImageTestPlan:

  public IEnumerable<SoftwareImageTestPlan> GetAssignedTestPlansForSPSI(int softwareProductID, int SoftwareImageID)
  {
      var records = _entities.tblSoftwareImageTestPlans
                             .Where(x => 
                               x.SoftwareProductID == SoftwareProductID && 
                               x.SoftwareImageID == SoftwareImageID)
                             .Select(x => new SoftwareTestPlan { 
                               Id = Id,  // example
                               ... do more mapping here  
                              })
                             .ToList();
  
      if (records == null)
          return new List<SoftwareImageTestPlan>();
      else
          return records;
  }