📅  最后修改于: 2022-03-11 14:59:16.195000             🧑  作者: Mango
var result = source
.GroupBy(x => x.Currency)
.Select(g => new {
Currency = g.Key,
Total = g.Sum(x => x.FeesCustom > 0 ? x.FeesCustom : x.FeesNormal)
});