asp.net-core - 将 Lambda 作为参数传递到 EFCore 中的存储库方法

Question

我正在尝试实现描述的存储库模式 here

但是，这些关系并未包含在内。

public IEnumerable<MyEntity> GetWithRelationship(params Expression<Func<MyEntity, object>>[] includeProperties)
{
  var set = _context.MyEntities;
  foreach (var includeProperty in includeProperties)
  {
    set.Include(includeProperty);
  }
  return set.ToList();
}

但是以下方法有效:

return _context.MyEntities.Include(x => x.RelatedEntity).ToList();

Answer 1

您必须重新分配set到 Include() 的返回值方法。但是，为了避免编译错误，您必须处理 set如IQueryable<MyEntity>第一:

var set = _context.MyEntities as IQueryable<MyEntity>;

foreach (var includeProperty in includeProperties)
{
    set = set.Include(includeProperty);
}

return set.ToList();