simple repository base based on EF

RepositoryBase.cs

public class DbContextUnitOfWork //: IUnitOfWork
{
    public System.Data.Entity.DbContext Context { get; private set; }
    private bool _disposed;
 
    public DbContextUnitOfWork(System.Data.Entity.DbContext context)
    {
        Context = context;
    }
 
    public bool Commit()
    {
        if (_disposed)
            throw new InvalidOperationException("UnitOfWork was disposed! Please start a new unit of work operation");
 
        return Context.SaveChanges() >= 0;
    }
 
    public void Dispose()
    {
        _disposed = true;
    }
}


public class RepositoryBase<TEntity> where TEntity : class, new()
{
    private readonly DbContext _context;
    private readonly IDbSet<TEntity> _set;

    public RepositoryBase(DbContextUnitOfWork uow)
    {
        _context = uow.Context;
        _set = _context.Set<TEntity>();
    }

    public TEntity Find(object key)
    {
        return _set.Find(key);
    }

    public IEnumerable<TEntity> Query(Func<TEntity, bool> predicate)
    {
        return _set.Where(predicate);
    }

    public IQueryable<TEntity> AsQueryable()
    {
        return _set;
    }

    public void Add(TEntity instance)
    {
        _context.Entry(instance).State = EntityState.Added;
    }

    public void Edit(TEntity instance)
    {
        _context.Entry(instance).State = EntityState.Modified;
    }

    public void Remove(TEntity instance)
    {
        _context.Entry(instance).State = EntityState.Deleted;
    }
}