如何从映射到实体的存储过程导航相关实体

Question

I have a complicated full-text search stored procedure that I have mapped to return an entity type. It won't allow me to navigate the references in the result though:

using (MyEntities kb = new MyEntities())
{
   var results = from customer in kb.SearchCustomers("blabla") select new 
   {
       CustomerName = customer.LastName + ", " + customer.FirstName,
       RegionName = customer.Region.Name
   };
}

This is throwing a null reference exception when referring to the customer.

Answer 1

We should check LastName and FirstName first. I think there are customers who don't have FirstName or Lastname.

using (MyEntities kb = new MyEntities())
{
   var results = from customer in kb.SearchCustomers("blabla") select new 
   {
       if(customer.LastName != null && customer.FirstName != null) 
       {
         CustomerName = customer.LastName + ", " + customer.FirstName,
         RegionName = customer.Region.Name
       }
   };
}