如何将此表达式转换为LINQ？

Question

是否可以将此表达式转换为LINQ？

TermsOfPayment termsOfPayment = null;
foreach (CustomerGroup group in _customer.CustomerGroups)
    if (termsOfPayment == null) termsOfPayment = group.TermsOfPayment;
    else if (group.TermsOfPayment != null)
        if (group.TermsOfPayment.InvoiceDueDays < termsOfPayment.InvoiceDueDays)
            termsOfPayment = group.TermsOfPayment;

这可能看起来像一个愚蠢的问题，因为上面的表达式解决了这个问题，但是我使用了一些LINQ表达式并且渴望更多 - 因此这篇文章的原因。

基本上我只想从客户所属的组中选择具有最小InvoiceDueDays（整数）值的TermsOfPayment对象。

Answer 1

termsOfPayment = (
                   from g in _customer.CustomerGroups
                   where g.TermsOfPayment != null
                   orderby g.TermsOfPayment.InvoiceDueDays
                   select g.TermsOfPayment
                 ).FirstOrDefault();

Answer 2

     var termsOfPayment =
        _customer.CustomerGroups.OrderBy(cg=>cg.TermsOfPayment.InvoiceDueDays)
        .First().Select(cg=>cg.TermsOfPayment);

Answer 3

为什么不使用聚合，速度也更好：

var termsOfPayment = 
    _customer.CustomerGroups.Aggregate((a, n) => n.TermsOfPayment.InvoiceDueDays < a.TermsOfPayment.InvoiceDueDays ? n : a).TermsOfPayment;