Question

I have a collection of type objects which I know they are type Employee. I’d like to perform some linq operations on them using the employee some thing similar to this:

 var options = (from e in m_Employees  
                      select (e as Employee).DepartmentCode).Distinct();

But the as employee is not surprisingly giving an error. is there a way around it?

Changing the collection is not really an options since I,m maintaining the code and I want to avoid big changes.

Answer 1

You can use either

from e in m_Employees.Cast<Employee>()
    select e.DepartmentCode

or

from e in m_Employees.OfType<Employee>()
    select e.DepartmentCode

Cast thows an error if you can not cast each item to Employee, but OfType will filter out those objects not matching the type.