static void Cleanup()
{
using (var context = new EFRecipesEntities())
{
context.ExecuteStoreCommand("delete from chapter3.event");
}
}
static void RunExample()
{
using (var context = new EFRecipesEntities())
{
context.Events.AddObject(new Event {
Name = "TechFest 2010", State = "TX", City = "Dallas"
});
context.Events.AddObject(new Event {
Name = "Little Blue River Festival", State = "MO", City = "Raytown"
});
context.Events.AddObject(new Event {
Name = "Fourth of July Fireworks", State = "MO", City = "Raytown"
});
context.Events.AddObject(new Event {
Name = "BBQ Ribs Championship", State = "TX", City = "Dallas"
});
context.Events.AddObject(new Event {
Name = "Thunder on the Ohio", State = "KY", City = "Louisville"
});
context.SaveChanges();
}
using (var context = new EFRecipesEntities())
{
Console.WriteLine("Using LINQ");
var results = from e in context.Events
group e by new { e.State, e.City } into g
select new
{
State = g.Key.State,
City = g.Key.City,
Events = g
};
Console.WriteLine("Events by State and City...");
foreach (var item in results)
{
Console.WriteLine("{0}, {1}", item.City, item.State);
foreach (var ev in item.Events)
{
Console.WriteLine("\t{0}", ev.Name);
}
}
}
using (var context = new EFRecipesEntities())
{
Console.WriteLine("\nUsing Entity SQL");
var esql = @"select e.State, e.City, GroupPartition(e) as Events
from Events as e
group by e.State, e.City";
var records = context.CreateQuery <DbDataRecord>(esql);
Console.WriteLine("Events by State and City...");
foreach (var rec in records)
{
Console.WriteLine("{0}, {1}", rec["City"], rec["State"]);
var events = (List <Event>)rec["Events"];
foreach (var ev in events)
{
Console.WriteLine("\t{0}", ev.Name);
}
}
}
Console.WriteLine("Press <enter> to continue...");
Console.ReadLine();
}
