Implementing Business Logic - ASP.NET Dynamic Data - page 295

the usual Edit, Delete, and Show All Items links used by the Details page template. Listing
9.4 shows the code-behind.
LISTING 9.4 Custom Order Page with Fulfill Button (Code-Behind)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.DynamicData;
using DataModel;
namespace WebApplication.Samples.Ch9.ContextMethod
{
public partial class SamplePage : System.Web.UI.Page
{
protected MetaTable ordersTable;
protected void Page_Init(object sender, EventArgs e)
{
this.ordersTable = MetaModel.Default.GetTable(typeof(Order));
this.formView.SetMetaTable(this.ordersTable);
this.dataSource.Include = this.ordersTable.ForeignKeyColumnsNames;
}
protected void FulfillButton_Click(object sender, EventArgs args)
{
using (var context = new NorthwindEntities())
{
int orderId = (int)this.formView.DataKey.Value;
context.FulfillOrder(orderId);
context.SaveChanges();
this.Response.Redirect(
this.ordersTable.GetActionPath(PageAction.Details,
new List<object>(new object[] { orderId })));
}
}
}
}
The FulfillButton_Click method handles the Click event of the Fulfill button. Because
the event handler is invoked during a post-back, the original Order entity instance
displayed by the page is no longer available. In this example, OrderID is extracted from
the DataKey property of the FormView control. Alternatively, if this were a custom page
template and the OrderID was available in the URL, you could have obtained it by calling
the GetColumnValuesFromRoute method of the MetaTable object discussed in Chapter 7.