How to use generic type with the database Context in EF6 Code First

Question

For example, let say I have 4 different entity that each implement a Add() method that add the entity to the database :

public class Profile
{
    ...

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Answer 1

The solution to your problem is to be more explicit with the definition of the generic constraint. Define the constraint as TEntity must be a sub-class of Entity i.e. use where TEntity : Entity instead of where TEntity : class

public abstract class Entity where TEntity : Entity
{
    protected DbContext _dbContext;

    protected Entity()
    {
        this._dbContext = new SMTDBContext();
    }

    public void Add()
    {
        this._dbContext.Set().Add((TEntity)this);
        this._dbContext.SaveChanges();
    }
}