Databases Reference
In-Depth Information
namespace WebApplication.DynamicData.CustomPages.Orders
{
public partial class Details : System.Web.UI.Page
{
protected MetaTable ordersTable;
protected MetaTable itemsTable;
protected void Page_Init(object sender, EventArgs e)
{
this.ordersTable = DynamicDataRouteHandler.GetRequestMetaTable(this.Context);
this.Title = this.ordersTable.DisplayName;
this.formDataSource.Include = this.ordersTable.ForeignKeyColumnsNames;
this.itemsTable = Global.DefaultModel.GetTable(typeof(Order_Detail));
this.gridView.SetMetaTable(this.itemsTable);
}
protected void GridDataSource_Selected(object sender,
EntityDataSourceSelectedEventArgs e)
{
IEnumerable<Order_Detail> orderItems = e.Results.Cast<Order_Detail>();
decimal totalAmount = orderItems.Sum(item => item.UnitPrice * item.Quantity);
this.totalLiteral.Text = totalAmount.ToString();
}
}
}
The
Page_Init
event handler performs the remaining initialization steps, similar to how
this is done in the dynamic page templates. The first part of this method still relies on the
GetRequestMetaTable
method of the
DynamicDataRouteHandler
class to retrieve the
Orders
MetaTable
using information in the URL route. This was simply carried over from the
dynamic Details page template. On the other hand, the
Order Details
MetaTable
has to be
obtained directly from the default
MetaModel
object registered in the
Global.asax
. This
MetaTable
object (
itemsTable
) is then associated with the
GridView
control to provide the
DynamicField
instances access to the metadata information they need to instantiate
appropriate field templates.
The
GridDataSource_Selected
method handles the
Selected
event of the
EntityDataSource
control that retrieves instances from the Order Details table. It calculates the total order
amount as a sum of UnitPrice values multiplied by the Quantity of the individual order
items. The result is then displayed in the
Literal
control on the page.
