_dic = _dic.OrderByDescending(x => x.Value).ToDictionary(x=>x.Key,x=>x.Value);
var Num = _dic.ToList().Take(5).Select(a => a.Key.ToString()).ToArray();
var Str = string.Join(",", Num); _dic = _dic.OrderByDescending(x => x.Value).ToD
阅读背景：
Linq排序，获取前5条数据
来源：互联网
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