C#实体框架6-如何从DbSet.RemoveRange方法获取计数

如何从

DbSet.RemoveRange

方法获取计数？当我尝试使用

Count（）

时，它在保存更改时抛出一个错误

_dbFileManagementRepository.FileManagements.RemoveRange(_dbFileManagementRepository.FileManagements.Where(x => x.Id == serviceId && x.DateAdded < purgeDate)).Count();
_dbFileManagementRepository.SaveChanges();

\u dbFileManagementRepository.FileManagements.RemoveRange（\u dbFileManagementRepository.FileManagements.Where（x=>x.Id==serviceId&&x.DateAdded

当我这样分配时，保存更改时不会删除任何内容

var records = _dbFileManagementRepository.FileManagements.RemoveRange(_dbFileManagementRepository.FileManagements.Where(x => x.Id == serviceId && x.DateAdded < purgeDate));
int purgeCount = records.Count();
_dbFileManagementRepository.SaveChanges();

var records=\u dbFileManagementRepository.FileManagements.RemoveRange（\u dbFileManagementRepository.FileManagements.Where（x=>x.Id==serviceId&&x.DateAdded

当我刚刚运行此命令时，它会很好地删除：

_dbFileManagementRepository.FileManagements.RemoveRange(_dbFileManagementRepository.FileManagements.Where(x => x.Id == serviceId && x.DateAdded < purgeDate));
_dbFileManagementRepository.SaveChanges();

\u dbFileManagementRepository.FileManagements.RemoveRange（\u dbFileManagementRepository.FileManagements.Where（x=>x.Id==serviceId&&x.DateAdded

使用RemoveRange，无论您做什么，您都需要两个查询，因此这对于您的情况来说应该很好：

var toBeRemoved = _dbFileManagementRepository.FileManagements.Where(x => x.Id == serviceId && x.DateAdded < purgeDate).ToList();
var removedCount = toBeRemoved.Count;
_dbFileManagementRepository.FileManagements.RemoveRange(toBeRemoved);
_dbFileManagementRepository.SaveChanges();

var-toBeRemoved=\u dbFileManagementRepository.FileManagements.Where（x=>x.Id==serviceId&&x.DateAdded

使用RemoveRange，无论您做什么，您都需要两个查询，因此这对于您的情况来说应该很好：

var toBeRemoved = _dbFileManagementRepository.FileManagements.Where(x => x.Id == serviceId && x.DateAdded < purgeDate).ToList();
var removedCount = toBeRemoved.Count;
_dbFileManagementRepository.FileManagements.RemoveRange(toBeRemoved);
_dbFileManagementRepository.SaveChanges();

var-toBeRemoved=\u dbFileManagementRepository.FileManagements.Where（x=>x.Id==serviceId&&x.DateAdded