Parameter in event handler is not hitting while debugging

Question

I have a eventhandler like this code below :

viewer.LocalReport.SubreportProcessing += new Microsoft.Reporting.WebForms.SubreportProcessingEventHandler(LocalReport_SubreportProcessing);

And this method as a parameter for event handler above :

private static void LocalReport_SubreportProcessing(object sender, SubreportProcessingEventArgs e) {

        DateTime movementDate = Convert.ToDateTime(e.Parameters[0].Values[0]);

        TourTransactionsController controller = new TourTransactionsController();

        var movement = controller.Movements();

        List<Movement> movementList = new List<Movement>();
        movementList.Add(new Movement {
            Destination = "TEST",
            MovementDescription = "TEST",
            DateTime = Convert.ToDateTime("2017-09-25")
        });

        e.DataSources.Clear();

        e.DataSources.Add(new Microsoft.Reporting.WebForms.ReportDataSource() {
            Name = "DSMovements",
            Value = movementList
        });

        //throw new NotImplementedException();
    }

Both of those method is written in a WEB API Controller . The eventhandler is hitting while debugging, but after I press F11 (step into) while debugging the LocalReport_SubreportProcessing method is not hitting. Why is LocalReport_SubreportProcessing method not hitting ?

Any help or answer is really appreciated.

Answer 1

Event's are not called when you register / add += them.

Events are called when the owning class invokes it.

public class EventTest
{
    void SomeOperation()
    {
        //Do something
    }

    public void Run()
    {
        SomeOperation();
        RunFinished?.Invoke(this, EventArgs.Empty); //Invoke the event, indicating that something has happened or finished
    }

    //The event itself
    public event EventHandler RunFinished;
}

public class EventSubscriber
{
    EventTest _ET = new EventTest();

    public EventSubscriber()
    {
        _ET.RunFinished += ETRunFinished; //Register my method, called when the event occurs (is invoked)
    }

    public void DoSomething()
    {
        _ET.Run();
        Console.WriteLine("Something completed.");
    }

    void ETRunFinished(object sender, EventArgs e)
    {
        Console.WriteLine("My event handler was executed.");
    }
}

Your handler will be called when the event fires.

When registering += or -= unregistering (add / remove) they will NOT be invoked.

For a more detailed tutorial please refer to MSDN.