如何计算外键项？

Question

我需要获取所有bank BankBranches cityId = filter.CityId > 0

代码：

 banks = from bank in banks
            where bank.BankBranches.Where(y => y.CityId == filter.CityId).Count() > 0
            select bank;
    var list = banks.ToList();

错误：

  

不允许从'Model.Entities.BankBranch'访问成员'Int32 CityId'   'System.Linq.IQueryable`a [Model.Entities.BankBranch]。

Answer 1

 banks = from bank in banks.Include(p=>p.BankBranches)
            where bank.BankBranches.Where(y => y.CityId == filter.CityId).Count() > 0
            select bank;
    var list = banks.ToList();

Answer 2

banks = from bank in banks
        join bankBranche in m_banksRepository.BankBranches on bank.Id equals bankBranche.BankId
        where bankBranche.CityId == filter.CityId
        select bank;