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C#两个集合多属性组合关联得到新的组合

代码

var isLackGroupA = useList.Select(d => new{billType = Convert.ToInt32(d["FBILLTYPEID"]),fid = Convert.ToInt64(d["FID"]),groupId = Convert.ToInt64(d["FREPLACEGROUP"]),}).Distinct().ToList();
var isLackList = (from a in isLackGroupAjoin b in useListon a equals new{billType = Convert.ToInt32(b["FBILLTYPEID"]),fid = Convert.ToInt64(b["FID"]),groupId = Convert.ToInt64(b["FREPLACEGROUP"])}into cfrom d in c.DefaultIfEmpty()select d).ToList();