/// <summary>
/// Fires the <see cref="ObjectContainerDataSourceView.Deleting"/> event.
/// </summary>
/// <param name="e">The event associated data.</param>
protected virtual void OnDeleting(ObjectContainerDataSourceDeletingEventArgs e)
{
EventHandler <ObjectContainerDataSourceDeletingEventArgs> handler =
base.Events[DeletingEventKey] as EventHandler <ObjectContainerDataSourceDeletingEventArgs>;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Performs a delete operation on the list of data that the <see cref="DataSourceView"/> object represents.
/// </summary>
/// <param name="keys">An <see cref="IDictionary"/> of object or row keys to be deleted by
/// the <see cref="DataSourceView.ExecuteDelete(System.Collections.IDictionary,System.Collections.IDictionary)"/>
/// operation.</param>
/// <param name="oldValues">An <see cref="System.Collections.IDictionary"/> of name/value pairs that represent data elements and their original values.</param>
/// <returns>The number of items that were deleted from the underlying data storage.</returns>
protected override int ExecuteDelete(IDictionary keys, IDictionary oldValues)
{
Guard.CollectionNotNullNorEmpty(keys, String.Format(CultureInfo.CurrentCulture, Resources.NoKeysSpecified), "keys");
ObjectContainerDataSourceDeletingEventArgs deletingEventArgs =
new ObjectContainerDataSourceDeletingEventArgs(DictionaryHelper.GetReadOnlyDictionary(keys), oldValues);
OnDeleting(deletingEventArgs);
if (deletingEventArgs.Cancel)
{
return(0);
}
int rowsAffected;
object instance = FindInstance(keys);
if (instance == null)
{
rowsAffected = 0;
}
else
{
Data.Remove(instance);
rowsAffected = 1;
}
instance = CreateInstance();
TypeDescriptionHelper.BuildInstance(oldValues, instance);
TypeDescriptionHelper.BuildInstance(keys, instance);
OnDataSourceViewChanged(EventArgs.Empty);
ObjectContainerDataSourceStatusEventArgs deletedEventArgs = new ObjectContainerDataSourceStatusEventArgs(instance, rowsAffected);
OnDeleted(deletedEventArgs);
return(rowsAffected);
}
