问实体框架DBSet非常慢

EN

public class EntityService<T> : IEntityService<T> where T : BaseEntity
{
    protected GraphicContext _context;
    protected DbSet<T> _dbset;

    public EntityService(GraphicContext context)
    {
        _context = context;
        _dbset = _context.Set<T>();
    }


    public virtual async Task CreateAsync(T entity)
    {
        if (entity == null)
        {
            throw new ArgumentNullException("entity");
        }

        _dbset.Add(entity);
        await _context.SaveChangesAsync();
    }

    public virtual async Task<T> FindAsync(params object[] keyValues)
    {
        if (keyValues == null)
        {
            throw new ArgumentNullException("id");
        }

        return await _dbset.FindAsync(keyValues);
    }

    public virtual async Task UpdateAsync(T entity)
    {
        if (entity == null) throw new ArgumentNullException("entity");
        _context.Entry(entity).State = System.Data.Entity.EntityState.Modified;
        await _context.SaveChangesAsync();
    }

    public virtual async Task DeleteAsync(T entity)
    {
        if (entity == null) throw new ArgumentNullException("entity");
        _dbset.Remove(entity);
        await _context.SaveChangesAsync();
    }

    public virtual IEnumerable<T> GetAll()
    {
        return _dbset.AsEnumerable<T>();
    }
}