如何转换为LINQ请求？

Question

var list = new List<ListCreaditInBankView>(); 
var banktemp = m_banksRepository.Banks; 
foreach (Bank bank in banktemp) 
{ 
    var bankbranchtemp = m_banksRepository.BankBranches.Where(x => x.BankId == bank.Id); 
    foreach (BankBranch bankBranch in bankbranchtemp) 
    { 
     var creditortemp = m_creditorsRepository.Creditors.Where(x => x.BankBranchId == bankBranch.Id); 
     list.Add(new ListCreaditInBankView(){Bank = bank, Creditors = creditortemp}); 

    } 

} 

我需要得到List<ListCreaditInBankView>没有这些周期。

我试过了，但它只是得到了Creditors

var lists = (from bank in banksTemp 
         let creditorBank = m_creditorsRepository.GetCreditorBank(bank.BankBranches.Select(x => x.Id).ToList()) 
         select new ListCreaditInBankView() {Bank = bank, Creditors = creditorBank}).ToList(); 

Answer 1

尝试以下操作：

var lists = (from bank in m_banksRepository.Banks 
      select new ListCreaditInBankView 
      { 
       Bank = bank, 
       Creditors = creditorsRepository.GetCreditorBank(bank.BankBranches 
        .Select(x => x.Id).ToList()) 
      }).ToList(); 

或者如果你喜欢其他风格的LINQ（method chaining它的名字，感谢努曼:)）：

var lists = m_banksRepository.Banks 
      .Select(bank => new ListCreaditInBankView 
      { 
       Bank = bank, 
       Creditors = creditorsRepository.GetCreditorBank(bank.BankBranches 
        .Select(x => x.Id).ToList()) 
      }).ToList(); 

Answer 2

如果您使用Linq 2 Entity框架，还有另一个框架你可以试试。

http://msdn.microsoft.com/en-us/library/bb896272.aspx

你只需要确保，你已经正确设置你的表和钥匙在你的数据库（或生成的模型至少映射），否则将无法正常工作。