/// <summary>
/// Raises current changing events
/// </summary>
/// <param name="e">The event args</param>
protected virtual void OnCurrentChanging(CurrentChangingEventArgs e)
{
CurrentChangingEventHandler handler = this.CurrentChanging;
if (handler != null)
{
handler(this, e);
}
}
private void OnCurrentChanging(CurrentChangingEventArgs e)
{
CurrentChangingEventHandler handler = CurrentChanging;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// currentchangingeventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this CurrentChangingEventHandler currentchangingeventhandler, Object sender, CurrentChangingEventArgs e, AsyncCallback callback)
{
if (currentchangingeventhandler == null)
{
throw new ArgumentNullException("currentchangingeventhandler");
}
return(currentchangingeventhandler.BeginInvoke(sender, e, callback, null));
}
/// <summary>
/// Raise the CurrentChanging event.
/// </summary>
/// <returns>
/// A value indicating whether the change should be cancelled.
/// </returns>
private bool RaiseCurrentChanging()
{
bool cancel = false;
CurrentChangingEventHandler handler = this.CurrentChanging;
if (handler != null)
{
CurrentChangingEventArgs args = new CurrentChangingEventArgs(true);
handler(this, args);
cancel = args.Cancel;
}
return(cancel);
}
public void CancelingCurrencyChangeIsRespectedOnCommitEdit()
{
City first = new City {
Name = "1"
};
City second = new City {
Name = "2"
};
MockEntityContainer ec = new MockEntityContainer();
ec.CreateSet <City>(EntitySetOperations.All);
IPagedEntityList pagedList = new MockPagedEntityList(ec.GetEntitySet <City>(), null);
PagedEntityCollectionView view = new PagedEntityCollectionView(pagedList, () => { });
view.Add(first);
view.Add(second);
bool canChangeCurrency = true;
CurrentChangingEventHandler changingHandler = (sender, e) =>
{
if (!canChangeCurrency)
{
Assert.IsTrue(e.IsCancelable,
"Event should be cancelable when commiting an edit.");
e.Cancel = true;
}
};
EventHandler changedHandler = (sender, e) =>
{
if (!canChangeCurrency)
{
Assert.Fail("Currency changes should only occur when canChangeCurrency is true.");
}
};
view.CurrentChanging += changingHandler;
view.CurrentChanged += changedHandler;
view.SortDescriptions.Add(new SortDescription("Name", ListSortDirection.Ascending));
Assert.IsTrue(view.MoveCurrentTo(second),
"We should be able to move current to the second item.");
// Commit an edit but do not allow the currency to change
canChangeCurrency = false;
view.EditItem(second);
second.Name = "0";
view.CommitEdit();
Assert.AreEqual(view[1], second,
"The edited item should not have moved.");
// Commit an edit and this time allow the currency to change
canChangeCurrency = true;
view.EditItem(second);
second.Name = "00";
view.CommitEdit();
Assert.AreEqual(view[0], second,
"The edited item should have moved to the first position in the view.");
}
