![Linq中Sum和Group的使用 Linq中Sum和Group的使用](https://image.shishitao.com:8440/aHR0cHM6Ly9ia3FzaW1nLmlrYWZhbi5jb20vdXBsb2FkL2NoYXRncHQtcy5wbmc%2FIQ%3D%3D.png?!?w=700&webp=1)
var query = from c in ds.Tables[].AsEnumerable()
group c by c.Field<int>("Name")
into s
select new
{
ID = s.Select(m => m.Field<int>("ID").ToString()),
Name = s.Select(m => m.Field<string>("Name").ToString()),
Math = s.Sum(p => p.Field<decimal>("Math")),
Chinese = s.Sum(p => p.Field<decimal>("Chinese"))
};
DataTable dtss = new DataTable();
dtss.Columns.Add(new DataColumn("ID", typeof(string)));
dtss.Columns.Add(new DataColumn("Name", typeof(string)));
dtss.Columns.Add(new DataColumn("Math", typeof(string)));
dtss.Columns.Add(new DataColumn("Chinese", typeof(string)));
query.ToList().ForEach(p => dtss.Rows.Add(p.ID, p.Name, p.Math, p.Chinese ));
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