Linq中Sum和Group的使用

时间:2023-03-09 16:37:20
Linq中Sum和Group的使用
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 ));

https://www.xuebuyuan.com/1879650.html