LinqToDataTable示例1-GroupBySum

DataTable dt = new DataTable("temp");

// Definindo os campos da Tabela
dt.Columns.Add("STATUS", typeof(string));
dt.Columns.Add("SLA", typeof(string));
dt.Columns.Add("Qtd", typeof(int));

var query = from temp in dt.AsEnumerable()
group temp by new{
STATUS = temp.Field<string>("STATUS"),
SLA = temp.Field<string>("SLA")
} into xGroup
select new {
STATUS = xGroup.Key.STATUS,
SLA = xGroup.Key.SLA,
QTD = xGroup.Sum(temp => temp.Field<int>("Qtd"))
};
GridView1.DataSource = query;
GridView1.DataBind();