/// <summary>
/// Fires the <see cref="ObjectContainerDataSourceView.Updating"/> event.
/// </summary>
/// <param name="e">The event associated data.</param>
protected virtual void OnUpdating(ObjectContainerDataSourceUpdatingEventArgs e)
{
EventHandler <ObjectContainerDataSourceUpdatingEventArgs> handler =
base.Events[UpdatingEventKey] as EventHandler <ObjectContainerDataSourceUpdatingEventArgs>;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Performs an update operation on the list of data that the <see cref="DataSourceView"/> object represents.
/// </summary>
/// <param name="keys">An <see cref="System.Collections.IDictionary"/> of object or row keys to be updated by the update operation.</param>
/// <param name="values">An <see cref="System.Collections.IDictionary"/> of name/value pairs that represent data elements and their new values.</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 updated in the underlying data storage.</returns>
protected override int ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues)
{
Guard.CollectionNotNullNorEmpty(keys, String.Format(CultureInfo.CurrentCulture, Resources.NoKeysSpecified), "keys");
Guard.ArgumentNotNull(values, "values");
ObjectContainerDataSourceUpdatingEventArgs updatingEventArgs =
new ObjectContainerDataSourceUpdatingEventArgs(DictionaryHelper.GetReadOnlyDictionary(keys), values, oldValues);
OnUpdating(updatingEventArgs);
if (updatingEventArgs.Cancel)
{
return(0);
}
object newInstance = CreateInstance();
TypeDescriptionHelper.BuildInstance(keys, newInstance);
TypeDescriptionHelper.BuildInstance(values, newInstance);
int rowsAffected;
object oldInstance = FindInstance(keys);
if (oldInstance != null)
{
int index = Data.IndexOf(oldInstance);
Data[index] = newInstance;
rowsAffected = 1;
}
else
{
rowsAffected = 0;
}
OnDataSourceViewChanged(EventArgs.Empty);
ObjectContainerDataSourceStatusEventArgs updatedEventArgs = new ObjectContainerDataSourceStatusEventArgs(newInstance, rowsAffected);
OnUpdated(updatedEventArgs);
return(rowsAffected);
}
