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var query=A.Where(w=>w.Style==1006)
.GroupBy(g => g.UserId)
.Select(s => new { id = s.Key, number = s.Count()})
.OrderByDescending(o => o.number);
var result = A.Where(c => c.Style == 1006)
.GroupBy(g => g.UserId)
.Select(e => new { id = e.Key, number = e.Count() })
.OrderByDescending(o => o.number);