asp.net - Sum the total in a column in datatable

Question

I have a question. I need to sum up the total amount in a single column in datatable. How do i proceed with it?

For example

Total
2
3
4
5
9
10

i need to get a grand total of the whole column.

Answer 1

最灵活的方法是使用Enumerable.Sum：

Int64 sum = table.AsEnumerable().Sum(r => r.Field<int>("total"));

请注意，您需要添加using System.Linq;.

你也可以使用DataTable.Computewhich 语法不易记忆，且有限制：

Int64 sum = (Int64) table.Compute("Sum (total)", null);

Answer 2

如果您使用的是 SQl 服务器，您可以让服务器计算它并返回总和..

SqlCommand cmd = new SqlCommand("SELECT SUM(Total) FROM MyTable", conn);
int nSum = (int)cmd.ExecuteScalar();