Bug 41813 - NullReferenceException when adding or modify an UITableView on Visual Studio Xib designer
Summary: NullReferenceException when adding or modify an UITableView on Visual Studio ...
Status: VERIFIED FIXED
Alias: None
Product: Visual Studio Extensions
Classification: Xamarin
Component: iOS Designer ()
Version: 4.1.0 (C7)
Hardware: PC Windows
: --- normal
Target Milestone: 4.2.0 (C8)
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2016-06-14 19:00 UTC by bugzilla
Modified: 2016-08-01 16:26 UTC (History)
8 users (show)

Tags:
Is this bug a regression?: Yes
Last known good build: 4.0.4.4


Attachments
Stacktrace (6.99 KB, text/plain)
2016-06-14 19:00 UTC, bugzilla
Details


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Status:
VERIFIED FIXED

Description bugzilla 2016-06-14 19:00:07 UTC
Created attachment 16325 [details]
Stacktrace

Hi,
when I add an UITableView or I try to change it for example adding a constraint on the Xib designet, it show me this error:

System.NullReferenceException: Object reference not set to an instance of an object.
   at MonoTouch.Design.Client.Windows.NativePropertyTable.<>c__DisplayClass39_0.<RefreshPropertyChooseEditor>b__1(PropertyChooseEntry t)
   ....

(see the attachment for the complete stacktrace)

If I undo the last edit (as designer suggest me) the tableview are removed and the error disappeare but instead if I close the view and I reaopen it, all work correctly utill I try to edit or move the tableview. Plus  if i click on UITableView before moving it and click on property tab, it doesn't work and shown the last element selected.

Please help because I can't edit any xib that use UITableView!
Thanks
Comment 2 Alan McGovern 2016-06-15 22:47:29 UTC
Already fixed in master:

https://github.com/xamarin/md-addins/commit/1b528cf3f7d4777b25bd44c139637ad2c91ffb0b
Comment 3 Alan McGovern 2016-06-15 22:50:28 UTC
Oh, no. This is different to the fix i mentioned above.
Comment 4 Alan McGovern 2016-07-15 19:35:43 UTC
This should've been fixed as part of https://github.com/xamarin/md-addins/commit/8fa0720624eda595ef77bd1b2749ca787790188e

*** This bug has been marked as a duplicate of bug 41907 ***
Comment 5 Ben Beckley 2016-07-22 17:08:10 UTC
I am still getting the NRE with XVS 4.1.2.9 (cycle7-sr1/e8360de)
https://gist.github.com/BenBeckley/da4a9604baf0aee8ab7534076f2170e4

But, this is working in XVS 99.0.0.2901 (master/7333d13). So, I am guessing that the fix just hasn't made it into cycle7-sr1 yet.
Comment 6 Alan McGovern 2016-07-22 17:20:53 UTC
We're unlikely to be able to backport a fix easily if that patch didn't fix it. Is this important enough to burn potentially several days to figure out what needs backporting?
Comment 8 Naqeeb 2016-07-25 14:51:27 UTC
as per comment 5, This issue is working fine with master build, and we are unable to check this issue with  xvs-win-cycle8  build as builds are failing in this lane.

Thanks!