Question

I have created a new empty List of type User (User is an Entity in my EDM)

List<User> AvailableLocums = new List<User>();
AvailableLocums = null;

I also have another List of type User which is populated with the results of a query

List<User> Locums = _shiftDateService.GetAvailableLocums(id, shiftDate.shiftDateID).ToList();

I then wish to loop around the Locums List, do some logic, and then add the User to my AvailableLocums List

foreach (var locum in Locums)
{
   //Do some logic

   AvailableLocums.Add(locum);

}

However, when I try to do this I get the following error

Object reference not set to an instance of an object.

I then tried to amend my code and do the following

foreach (var locum in Locums)
{
       //Do some logic

       User locumUser = new User();
       locumUser = locum;

       AvailableLocums.Add(locumUser);     
}

But again I get the same error

Object reference not set to an instance of an object.

Could someone please help me with this?

Thanks.

Answer 1

You are nulling out that list

List<User> AvailableLocums = new List<User>();
AvailableLocums = null; // HERE

hence, the exception. You don’t need this line to make an empty list:

AvailableLocums = null;