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BerndH




Posts: 116
 Joined: 2014-09-23
Hi,

I have some code that's causing a new error: without the code, my add-in starts perfectly. With the code, I get an error. I've set a breakpoint, but I'm not hitting it. I've also set a breakpoint in the `public AddinModule()` function in the first line, but I'm not hitting that one either: the error message from my code appears earlier.

Could you describe how the add-in is started in Outlook, or what happens before the `AddinModule` function?

Bernd
Posted 26 Mar, 2026 08:57:35 Top
Andrei Smolin


Add-in Express team


Posts: 19218
 Joined: 2006-05-11
Hello Bernd,

Make sure your add-in loads at all: when Office loads your add-in, adxloader.log is updated.

I suppose your code is invoked before the constructor is run. Say, you have a class-level variable of a complex type and that variable has an initializer e.g. it is set to null. You should remove such initializers and initialize such variables in the following method: 

protected override void OnHostApplicationInitialized()
{
    base.OnHostApplicationInitialized();
    //  your code here
}


This method is called when Add-in Express obtains the Application object of your add-in's host application. This is the point where your add-in's life starts.

Regards from Poland (GMT+1),

Andrei Smolin
Add-in Express Team Leader
Posted 26 Mar, 2026 10:22:25 Top