Question

我有两个不同列的列表，但每个列表都有一个具有相同键的公共列，如何将它们组合成一个新列表，即：

public class TradeBalanceBreak
{
    public int CommID { get; set; }
    public int CPFirmID { get; set; }
    public double CreditDfferenceNotional { get; set; }
    public string Currency { get; set; }
}

public class Commission
{
    public int CommID { get; set; }
    public PeriodStart { get; set; }
    public ResearchCredit { get; set; }
}

public class CommissionList
{
    public List<Commission> Commissions { get { return GetCommissions(); }}

    private List<Commission> GetCommissions()
    {
        // retrieve data code ... ...
    }
}

public class TradeBalanceBreakModel
{
    public List<TradeBalanceBreak> TradeBalanceBreaks { get; set; }
}

public class CommissionModel
{
    public List<CommissionList> CommissionLists { get; set; }
}

我想要实现的是将TradeBalancesBreaks和CommissionLists（来自模型类）合并/展平为一个。 CommID在两者之间共享。

感谢。

Answer 1

var combined = from p in PhoneNumbers
               join a in Addresses on a.ID equals p.ID
               select new {
                   ID = p.ID,
                   Name = p.Name,
                   Phone = p.Phone,
                   Address = a.Address,
                   Fax = a.Fax
               };

Answer 2

使用Join（扩展方法版本） - 更新后

 var list1 = GetTradeBalanceBreaks();
 var list2 = new CommisionsList().Commissions;

 var combined = list1.Join( list2,  l1 => l1.ID, l2 => l2.First().ID,
                            (l1,l2) = > new
                                        {
                                           l1.CommID, 
                                           l1.CPFirmID,
                                           l1.CreditDifferenceNotional,
                                           l1.Currency,
                                           PeriodStarts= l2.SelectMany( l => l.PeriodStart ),
                                           ResearchCredits = l2.SelectMany( l => l.ResearchCredit ) 
                                       })
                     .ToList();

LINQ - 组合多个列表以形成新列表并按键对齐它们？

2 个答案: