private static void ChangeInformation()
{
using (var data = new Formula1Entities())
{
var jaime = new Racer
{
Firstname = "Jaime",
Lastname = "Alguersuari",
Country = "Spain",
Starts = 0
};
data.Racers.AddObject(jaime);
Racer fernando = data.Racers.Where("it.Lastname='Alonso'").First();
fernando.Starts++;
DisplayState(EntityState.Added.ToString(),
data.ObjectStateManager.GetObjectStateEntries(EntityState.Added));
DisplayState(EntityState.Modified.ToString(),
data.ObjectStateManager.GetObjectStateEntries(EntityState.Modified));
ObjectStateEntry stateOfFernando =
data.ObjectStateManager.GetObjectStateEntry(fernando.EntityKey);
Console.WriteLine("state of Fernando: {0}",
stateOfFernando.State.ToString());
foreach (string modifiedProp in stateOfFernando.GetModifiedProperties())
{
Console.WriteLine("modified: {0}", modifiedProp);
Console.WriteLine("original: {0}", stateOfFernando.OriginalValues[modifiedProp]);
Console.WriteLine("current: {0}", stateOfFernando.CurrentValues[modifiedProp]);
}
int changes = 0;
try
{
changes += data.SaveChanges();
}
catch (OptimisticConcurrencyException ex)
{
data.Refresh(RefreshMode.ClientWins, ex.StateEntries);
changes += data.SaveChanges();
}
Console.WriteLine("{0} entities changed", changes);
}
}
/// <summary>
/// Deprecated Method for adding a new object to the Racers EntitySet. Consider using the .Add method of the associated ObjectSet<T> property instead.
/// </summary>
public void AddToRacers(Racer racer)
{
base.AddObject("Racers", racer);
}