Public Event Querying As EventHandler(Of EntityQueryingEventArgs)

Dim instance As EntityManager
Dim handler As EventHandler(Of EntityQueryingEventArgs)
 
AddHandler instance.Querying, handler

public event EventHandler<EntityQueryingEventArgs> Querying

public:
event EventHandler<EntityQueryingEventArgs^>^ Querying

public void EntityManager_EventSample() {

  var mgr = new DomainModelEntityManager();
  // Setup some handlers.
  mgr.Querying += QueryingHandler;
  mgr.Fetching += FetchingHandler;
  mgr.Queried += QueriedHandler;
  mgr.Saving += SavingHandler;
  mgr.Saved += SavedHandler;

  // Now try some fetches and saves.

  var orders = mgr.OrderSummaries
    .Where(o => o.Customer.Id == 1)
    .Include("Customer")
    .Include("OrderDetails").ToList();
  DebugFns.WriteLine("Order count = " + orders.Count.ToString());

  // Change the first order and its details.
  OrderSummary anOrder = orders[0];
  anOrder.Freight = 200;
  foreach (OrderDetail dtl in anOrder.OrderDetails) {
    dtl.Discount = .05F;
  }
  SaveResult sr = mgr.SaveChanges();
}

void QueryingHandler(object sender, EntityQueryingEventArgs e) {
  DebugFns.WriteLine("Querying " + e.Query.ToString());
}

void FetchingHandler(object sender, EntityFetchingEventArgs e) {
  DebugFns.WriteLine("Fetching " + e.Query.ToString());
}

void QueriedHandler(object sender, EntityQueriedEventArgs e) {
  DebugFns.WriteLine("Queried " + e.Query.ToString());
  foreach (Entity anEntity in e.Results) {
    DebugFns.WriteLine("Queried - " + anEntity.EntityKey.ToString());
  }
}

void SavingHandler(object sender, EntitySavingEventArgs e) {
  foreach (Entity anEntity in e.Entities) {
    DebugFns.WriteLine("Saving - " + anEntity.EntityKey.ToString() + " - " + anEntity.EntityState.ToString());
  }
}
void SavedHandler(object sender, EntitySavedEventArgs e) {
  foreach (Entity anEntity in e.Entities) {
    DebugFns.WriteLine("Saved - " + anEntity.EntityKey.ToString());
  }
}