Exceptions thrown in the `OnLoad` method are ignored?

Question

I have this piece of code

partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    protected override void OnLoad(EventArgs e)
    {
        throw new InvalidOperationException();
        base.OnLoad(e);
    }
}

The program run fine and the exception I throw in the OnLoad(EventArgs e) is completely ignored. I've tested it in VS2012 .NET 4.5 both debug and release mode, same result. It's this normal and if so why?

score 4 · Accepted Answer · answered Sep 26 '13 at 16:28

It's because of the Exceptions option in your VS. If you look in the Output window, you should see there is a message printed like this A first chance exception of type 'System.InvalidOperationException' occurred in...

To enable the throwing exception, you can go to Debug -> Exceptions -> Common Language Runtime Exceptions, then you can expand the namespaces and find the exception you want, in your case it's System.InvalidOperationException. Then check the Thrown in the Thrown column.

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You're right this work, but doesn't understand why only in the `OnLoad` the exception is ignored and not everywhere. — Alessandro D'Andria, Sep 26 '13 at 16:50

Exceptions thrown in the `OnLoad` method are ignored?

1 Answers1