Bug 46162 - NSMenu.IndexOfItem binding error
Summary: NSMenu.IndexOfItem binding error
Status: VERIFIED FIXED
Alias: None
Product: Xamarin.Mac
Classification: Desktop
Component: Library (Xamarin.Mac.dll) ()
Version: Master
Hardware: PC Mac OS
: Normal normal
Target Milestone: (C9)
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2016-10-28 19:27 UTC by Sandy Armstrong [MSFT]
Modified: 2016-11-22 10:35 UTC (History)
5 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
VERIFIED FIXED

Description Sandy Armstrong [MSFT] 2016-10-28 19:27:04 UTC
Xamarin.Mac
Version: 3.0.0.139 (Visual Studio Enterprise)

`NSMenu.IndexOfItem(NSObject target, Selector actionSelector)` appears to be bound incorrectly. Apple documentation says that `target` can be `nil`, but if I pass `null` along with any non-null selector, an ArgumentNullException is raised for the `target` parameter.

Try the following in a Mac workbook to reproduce:

    NSApplication.SharedApplication.MainMenu.IndexOfItem (null, new ObjCRuntime.Selector("quit:"))
Comment 1 Chris Hamons 2016-10-28 21:02:03 UTC
https://github.com/xamarin/xamarin-macios/pull/1068
Comment 4 Timothy Risi 2016-11-21 21:01:27 UTC
Hi Sachin,

The reason you're getting the NullReferenceException there is because at the point you're trying to call NSApplication.SharedApplication.MainMenu.IndexOfItem in the Main method there, MainMenu is still null (So you're trying to call a method on a null object).  If you move your call into the AppDelegate's DidFinishLaunching method, it works fine.