LINQ - 组合多个列表以形成一个新列表并按键对齐它们？

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; }
}

我想要实现的是合并/扁平化TradeBalancesBreaks and CommissionLists（来自模型类）合而为一。这CommID两者之间共享。

Thanks.

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();