Bug 395 - [PATCH] When localized, null reference exception in TableLayoutPanel.ColumnStyles.Clear() / RowSyles.Clear()
Summary: [PATCH] When localized, null reference exception in TableLayoutPanel.ColumnSt...
Alias: None
Product: Class Libraries
Classification: Mono
Component: Windows.Forms ()
Version: 2.10.x
Hardware: PC All
: --- normal
Target Milestone: Untriaged
Assignee: Thomas Goldstein
Depends on:
Reported: 2011-08-25 05:35 UTC by chriss-79
Modified: 2011-11-28 14:00 UTC (History)
2 users (show)

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

Test case (24.02 KB, application/x-zip-compressed)
2011-09-01 16:51 UTC, Thomas Goldstein
patch that fixes crash. (1.45 KB, patch)
2011-10-17 08:10 UTC, Tom Hindle

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Description chriss-79 2011-08-25 05:35:11 UTC
Description of Problem:
When using .net localization, a call to TableLayoutPanel.ColumnStyles.Clear() or TableLayoutPanel.RowSyles.Clear() raises 

System.NullReferenceException: Object reference not set to an 
 instance of an object
     at System.Windows.Forms.TableLayoutStyleCollection.Clear () 
 [0x00000] in <filename unknown>:0
     at Test_TableLayoutPanel.Form1.button1_Click (System.Object sender, 
 System.EventArgs e) [0x00000] in <filename unknown>:0

Steps to reproduce the problem:
1. Create a new windows application project in Visual Studio (I tested only
with .net 2)
2. Add a TableLayoutPanel to the form
3. Add a button that calls tableLayoutPanel1.ColumnStyles.Clear()
4. Enable Localizable property of Form
5. Compile in Visual Studio

Actual Results:
  When clicking the button the above exception is raised.

Expected Results:
  Same behavior like without localization enabled: No exception.

How often does this happen? 
  Always (when localized)

Additional Information:
  No need to actually add a second language - the behavior can be seen after setting Localizable to true.

Tested with following envorinments:
- Windows 7 32 bit / Mono 2.20.4
- Linux Ubuntu 10.04 32 bit / Mono 2.4.4
- Linux Ubuntu 11.10 alpha 32 bit / Mono 2.10.3
Comment 1 Thomas Goldstein 2011-09-01 16:51:52 UTC
Created attachment 234 [details]
Test case

Please attach a test case next times.
Comment 2 Tom Hindle 2011-10-17 08:10:48 UTC
Created attachment 710 [details]
patch that fixes crash.
Comment 3 Tom Hindle 2011-10-17 08:12:13 UTC
Please review.
Comment 4 Thomas Goldstein 2011-11-25 17:41:44 UTC
Nit: shouldn't it be an ArgumentNullException?
Otherwise, looks good to me, please commit.
Comment 5 Tom Hindle 2011-11-28 12:57:06 UTC
Thanks for the review.

done commits b8fb0fe96fe3fccdb3a3f40defc89b04c43bc4d9 in b67c792ec351d47fe354764ca349220faaefa374 

Sorry for the two commits :(
Comment 6 Thomas Goldstein 2011-11-28 14:00:31 UTC
Thanks. And sorry it took me so long to check out your patch (missed the notification mail somehow).

Marking as fixed.