Konstrukt
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Events
Configuring event handlers in Konstrukt, the back office UI builder for Umbraco.
Konstrukt fires a number of notification events during regular operation to allow for extending of the default behaviour.

Konstrukt uses the same notification mechanism built into Umbraco v9 and so uses the same registration process. You first need to define a notification event handler for the event you wish to handle like so.
public class MyEntitySavingEventHandler : INotificationHandler<KonstruktEntitySavingNotification> {
public void Handle(ContentPublishedNotification notification)
{
// Handle the event here
}
}
You then register your event handler in the ConfigureServices method of your Startup.cs file like so.
public void ConfigureServices(IServiceCollection services)
{
services.AddUmbraco(_env, _config)
.AddBackOffice()
.AddWebsite()
.AddComposers()
.AddNotificationHandler<KonstruktEntitySavingNotification, MyEntitySavingEventHandler>()
.Build();
}

Raised when the repository Save method is called and before the entity has been persisted. The notification contains an Entity property with Before and After inner properties providing access to a copy of the currently persisted entity (or null if a new entity) and the updated entity about to be saved. Changes can be made to the After entity and they will be persisted as part of the save operation. If the Cancel property of the notification is set to true then the save operation will be cancelled and no changes will be saved.
// Example
public class MyEntitySavingEventHandler : INotificationHandler<KonstruktEntitySavingNotification> {
public void Handle(KonstruktEntitySavingNotification notification)
{
var person = notification.Entity.After as Person;
if (person != null){
...
}
}
}

Raised when the repository Save method is called and after the entity has been persisted. The notification contains an Entity property with Before and After inner properties providing access to a copy of the previously persisted entity (or null if a new entity) and the updated entity just saved.
// Example
public class MyEntitySavedEventHandler : INotificationHandler<KonstruktEntitySavedNotification> {
public void Handle(KonstruktEntitySavedNotification notification)
{
var person = notification.Entity.After as Person;
if (person != null){
...
}
}
}

Raised when the repository Delete method is called and before the entity is deleted. The notification contains an Entity property providing access to a copy of the entity about to be deleted. If the Cancel property of notification is set to true then the delete operation will be cancelled and entity won't be deleted.
// Example
public class MyEntityDeletingEventHandler : INotificationHandler<KonstruktEntityDeletingNotification> {
public void Handle(KonstruktEntityDeletingNotification notification)
{
var person = notification.Entity.After as Person;
if (person != null){
...
}
}
}

Raised when the repository Delete method is called and after the entity has been deleted. The notification contains an Entity property providing access to a copy of the entity just deleted.
// Example
public class MyEntityDeletedEventHandler : INotificationHandler<KonstruktEntityDeletedNotification> {
public void Handle(KonstruktEntityDeletedNotification notification)
{
var person = notification.Entity.After as Person;
if (person != null){
...
}
}
}

Raised when the repository is preparing a SQL query. The notification contains the collection alias + type, the NPoco Sql<ISqlContext> object and the where clause / order by clauses that will be used to generate the SQL query.
// Example
public class MySqlQueryBuildingEventHandler : INotificationHandler<KonstruktSqlQueryBuildingNotification> {
public void Handle(KonstruktSqlQueryBuildingNotification notification)
{
notification.Sql = notification.Sql.Append("WHERE MyId = @0", 1);
}
}

Raised when the repository has repaired a SQL query. The notification contains the collection alias + type, the NPoco Sql<ISqlContext> object and the where clause / order by clauses that was used to generate the SQL query.
// Example
public class MySqlQueryBuiltEventHandler : INotificationHandler<KonstruktSqlQueryBuiltNotification> {
public void Handle(KonstruktSqlQueryBuiltNotification notification)
{
notification.Sql = notification.Sql.Append("WHERE MyId = @0", 1);
}
}
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Registering event handlers
Repository events
KonstruktEntitySavingNotification
KonstruktEntitySavedNotification
KonstruktEntityDeletingNotification
KonstruktEntityDeletedNotification
KonstruktSqlQueryBuildingNotification
KonstruktSqlQueryBuiltNotification