In Entity Framework, how do I add a generic entity to its corresponding DbSet without a switch statement that enumerates all the possible DbSets?

Question

I have two types of entities: an employee entity and an office entity, with a one to many relationship between the two such that there are many employees for one office. For

Answer 1

You might consider a generic class like so:

 public class GenericRepository<T> where T : class
 {
    internal YourConext context;
    internal DbSet<T> dbSet;

    public GenericRepository(YourContext context)
    {
        this.context = context;
        this.dbSet = context.Set<T>();
    }

    public virtual void Insert(T entity)
    {
        dbSet.Add(entity);
        context.SaveChanges();
    }

  }

Answer 2

If you have an extension method like...

public static void Create<T>(this DbContext db, T entityToCreate)
    where T : class
{
    db.Set<T>().Add(entityToCreate);
    db.SaveChanges();
}

...C# will do the type inference for you. You can just call it as...

db.Create(office);

...without ever having to worry about the type. Of course you should enter a known entity type.