查询结果不能被枚举一次以上

Question

I'm trying to retrieve a specific number of data for paging, I have no idea why the Skip Query returns an empty List and it throws the following exception "The result of a query cannot be enumerated more than once"

IEnumerable<ImgOrgSet> query = _ImgOrgRepository.GetImgOrgList();
IEnumerable<ImgOrgSet> queryPaginated = query.OrderBy(x => x.Id).Skip((CurrentPage - 1) * PageSize).Take(PageSize);

Answer 1

如以上注释和路标重复所示，您需要添加.ToList()以使结果明确可用于进一步处理。

Answer 2

I think it throws the exception because you expanded the 'query' variable before in the 'debug window'. Try running it again and don't expand the query/debug.