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// 1
var suplist = EF.Item.Where(x => x.ItemName == "沙发").Select(x=>x.Sup.supName);
//2
var itemIds = EF.Item.Where(x => x.ItemName == "沙发").Select(x=>x.ID);
var suplist = EF.Sup.Where(x => itemIds.Contains(x.supID)).Select(x=>x.supName);