c# - 减少代码C#中的多个foreach循环

Question

我写了一个非常凌乱的代码，只是因为我不知道如何遍历多个对象列表。

代码正在按预期的方式工作，但我对此没有信心。
有人知道如何重构这种代码以使其更具可读性吗？

foreach (var outlet in merchant.Outlets)
{
    if (outlet != null)
    {
        foreach (var terminal in merchant.Terminals)
        {
            if (terminal != null)
            {
                foreach (var agreement in terminal.AssociateAgreements)
                {
                    var bankInfo = new Bank();
                    if (agreement != null)
                    {
                        bankInfo.UniqueID = AgreementUniqueCode + agreement.ID;
                        bankInfo.BankBIC = agreement.BankAccountInformation.SwiftBIC;
                        bankInfo.BankName = agreement.BankAccountInformation.BankName;
                        bankInfo.Address =
                            AddressEntityToAddress(agreement.BankAccountInformation.BankAddress,
                                BankingType);

                        bankInfo.type = BankType;
                    }
                    banksAccountInformation.Add(bankInfo);
                }
            }
        }
    }
} 

Answer 1

您还可以使用linq查询语法：

var outletQuery = from outlet in merchant.Outlets
                  where outlet != null
                  select outlet;

var agreementQuery = from terminal in merchant.Terminals
                     where terminal != null
                     from agreement in terminal.AssociateAgreements
                     select agreement;

foreach (var outlet in outletQuery)
{
    foreach (var agreement in agreementQuery)
    {
       ProcessAgreement(agreement);
    }
}