Cannot compare elements of type 'System.Collections.Generic.ICollection`1 Only primitive types, enumeration types and entity types are supported

Question

I have written this code

IQueryable sites = context.MainTable.Include(\"RelatedTable\");

if (!string.IsNullOrEmpty(param1)) {
    sites = sites.         


        

Answer 1

It work me , I just remove the null check;

correct: result=

db.EmpTable.FirstOrDefault().ProjectsAssign.Name,

InCorrect : result=

db.EmpTable!=null && db.EmpTable.FirstOrDefault().ProjectsAssign!=null ? 
      db.EmpTable.FirstOrDefault().ProjectsAssign.Name : null,