Is it possible to create a generic method for adding items to a entity framework dbset?

I have not worked with Entity Framework or generics before and am having some difficulty reducing my code.

I am parsing a text file to load 10 lookup tables with data that could possibly change nightly. The text files have a heading for the "type" followed by a list of key/value sets. I have this working perfectly, but I would like to refactor the code to clean it up and would like to use generic methods to accomplish this so I can reduce the duplicated code.

I have gotten the parsing down to a generic method, but I have not been able to figure out how to get the entities added to the context in a generic way. I have to loop over a list of the entities for each type and add them to the context:

void Main()
{
    switch (line.ToUpper())
    {
        case "AREA":
        {
            List<Area> areaList = this.GetItems<Area>(file);

            foreach (var element in areaList)
            {
                if (context.Area.Find(element.Id) == null)
                {
                    context.Area.Add(element);
                }
            }

            break;
        }
        case "CATEGORY":
        {
            List<Category> categoryList = this.GetItems<Category>(file);

            foreach (var element in categoryList)
            {
                if (context.Category.Find(element.Id) == null)
                {
                    context.Category.Add(element);
                }
            }

            break;
        }
    }
}

private List<T> GetItems<T>(StreamReader reader) where T : ILookupData, new()
{
    string line;
    List<T> list = new List<T>();            

    while (reader.Peek() == ' ')
    {
        line = reader.ReadLine().TrimStart();
        string[] tokens = line.Split(new string[] { " - " }, 2, StringSplitOptions.None);

        T item = new T();
        item.Id = Convert.ToInt32(tokens[0]);
        item.Description = (string)tokens[1];

        lis