Question

I have a GridView that uses LinqDataSource. The GridView has default paging enable. I would like to retrieve the data from LinqDataSource before the paging takes place so that I could calculate the Sum of one single column of the whole database using Linq2SQL.

Right now, I’m using LinqDataSource_Selected event with LinqDataSourceStatusEventArgs.Result, but it only returns me the data AFTER paging (that is, the data on that page).

protected void linqDataSource_Selected(Object sender, LinqDataSourceStatusEventArgs e)  
{  
    var totalTime = (e.Result as List<Ticket>).Sum(t => t.TimeSpent);  
    gridView.Columns[8].FooterText = "Sum: " + totalTime;  
}

So my question is: How can I retrieve data from LinqDataSource before paging takes place?

Answer 1

The LINQDataSource class has a GetView() method which returns a DataSourceView object. DataSourceView has an ExecuteSelect() method which will query the datasource directly. You should be able to use LINQ syntax on the ExecuteSelect() method to get your sum.