C# 4 and .NET 4

DataGrid ❘ 1067
}
{
}
return new Lazy(() =>
{
return from rr in F1DataContext.Data.RaceResults
where rr.Race.Date == this.Date
select new F1RaceResult
{
Position = rr.Position,
Racer = rr.Racer.Firstname + " " +
rr.Racer.Lastname,
Car = rr.Team.Name
};
});
}
code snippet Formula1Demo/F1Race.cs
The final class of the hierarchy is F1RaceResult, which is a simple data holder for Position, Racer,
and Car:
public class F1RaceResult
{
public int Position { get; set; }
public string Racer { get; set; }
public string Car { get; set; }
}
code snippet Formula1Demo/Championship.cs
When you run the application, you can see at first all the years of the championships in the tree view.
Because of binding, the next level is already
accessed — every Championship object
already has the F1Race objects associated.
The user doesn’t need to wait for the first level
after the year or an open year with the default
look of a small triangle. As you can see in
Figure 36-14, the year 1984 is open. As soon as
the user clicks on a year to see the second-level
binding, the third level is done and the race
results are retrieved.
Of course you can also customize the TreeView
control and define different styles for the
complete template or the items in the view.
daTagrid
Prior to .NET 4, a DataGrid control was missing
with WPF. Now it’s here! With the DataGrid
control, information is displayed within rows and
columns, and can also be edited.
figure 36-14
The DataGrid control is an ItemsControl and defines the ItemsSource property that is bound to a
collection. The XAML code of this user interface also defines two RepeatButton controls that are used for
paging functionality. Instead of loading all the race information at once, paging is used so users can step
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