http://bbs.csdn.net/topics/391085792
DataTable 老表= 新表.AsEnumerable().GroupBy(p => p["姓名"]).SelectMany(p => p.GroupBy(s => s["年龄"]).Select(x => x.First())).CopyToDataTable<DataRow>();
2022-11-30 15:38:27
DataTable 老表= 新表.AsEnumerable().GroupBy(p => p["姓名"]).SelectMany(p => p.GroupBy(s => s["年龄"]).Select(x => x.First())).CopyToDataTable<DataRow>();
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