COM+ 

Using COM+ Components

• Do the following: 
  • Create typed dataset (with the name 'cdDataSet') for the database of cds
  • Create COM+ component
    • Implement interface with methods:
      • void AddOrder( int idRecord );
        add a row into tblOrders table with IDRecord set to idRecord
      • void AcceptOrder( int idOrder );
        set Accepted to true in a row from tblOrders with IDOrder = idOrder
      • cdDataSet GetData();
        get all data from the database as a dataset
  • Create Windows Forms application
    • Create a form with controls:
      • A DataGrid
      • A TextBox
      • 3 buttons: 'GetData', 'AddOrder', 'AcceptOrder' - pushing each button should call appropriate method from created COM+ component; results of GetData() method show in the datagrid; value of the parameter get from the textbox
  • Use Loosely Coupled Events
    • Create new COM+ component with events (called from appropriate methods of the first COM+ component):
      • void OrderAdded( int idRecord );
      • void OrderAccepted( int idOrder );
    • Subscribe the Windows Forms applications for events
      • Use COMAdminWrapper.cs file
      • Use the following code to subscribe for events

        I_08_Events subscriberInterface = this as I_08_Events;
        COMAdmin.ICOMAdminCatalog pICat = new COMAdmin.COMAdminCatalogClass() as COMAdmin.ICOMAdminCatalog;
        COMAdminWrapper.Subscriptions.AddTransientSubscription(
            pICat,                                      //ICOMAdminCatalog
            subscriptionID.ToString(),                  // Subscription name
            _08_Events.EventClassCLSID,                 // EventClass to subscribe to
            null,                                       // PublisherID
            _08_Events.FiringInterfaceID,               // FiringInterfaceID
            subscriberInterface,                        // the transient interface pointer on this form
            null,                                       // methodName
            null,                                       // FilterCriteria
            null,                                       // Publisher property name
            null);                                      // publisher property value
        

      • Use the following code to unsubscribe from events

        COMAdmin.ICOMAdminCatalog pICat = new COMAdmin.COMAdminCatalogClass() as COMAdmin.ICOMAdminCatalog;
        COMAdminWrapper.Subscriptions.RemoveTransientSubscription(pICat, subscriptionID.ToString());
        

• Approximate points:
  • COM+ components:
  • COM+ component's features: 3.0
  • database logic: 2.0
  • Windows Forms application: 2.5
  • using Loosely Coupled Events: 2.5