Bug 41842 - Set MasterDetailPage.Detail = New Page() twice will crash the application when set MasterBehavior = MasterBehavior.Split
Summary: Set MasterDetailPage.Detail = New Page() twice will crash the application whe...
Alias: None
Product: Forms
Classification: Xamarin
Component: Windows ()
Version: 2.2.0
Hardware: PC Windows
: Normal major
Target Milestone: UWP
Assignee: Bugzilla
Depends on:
Reported: 2016-06-15 10:12 UTC by Mike
Modified: 2016-06-30 13:40 UTC (History)
4 users (show)

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

MasterDetail Page crash problem with MasterBehavior="Split" (69.47 KB, application/x-rar)
2016-06-15 17:49 UTC, Mike

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Description Mike 2016-06-15 10:12:29 UTC
If using UWP MasterDetailPage, set MasterBehavior = MasterBehavior.Split 

then if we set this twice : MasterDetailPage.Detail = New Page() ;

The application will crash.
Comment 1 Samantha Houts [MSFT] 2016-06-15 17:11:01 UTC
The MasterDetailPage has a couple of minimum requirements:

1. You must set both the Master and Detail page.
2. The Master page must have a Title.

If these requirements are not met, the application will throw an InvalidOperationException. This is expected.

The following setup will work without error.

MasterBehavior = MasterBehavior.Split;

Master = new Page() { Title = "Master" };

Detail = new Page();
Detail = new Page();

Thank you!
Comment 2 Mike 2016-06-15 17:32:12 UTC
Yes, the master page already set and it already has the title.  I already create the master page in the MasterDetailPage itself.

This is my MasterDetail page.

    <ContentPage Title="My Title">
          --         -- 
Comment 3 Mike 2016-06-15 17:32:54 UTC
Hold.  I create a sample file and upload.
Comment 4 Mike 2016-06-15 17:47:09 UTC
I confirm the problem again. Please download the sample code which I upload and check it. Thank you.
Comment 5 Mike 2016-06-15 17:49:43 UTC
Created attachment 16341 [details]
MasterDetail Page crash problem with MasterBehavior="Split"
Comment 6 Samantha Houts [MSFT] 2016-06-16 01:40:15 UTC
I see. This appears to only happen if the MainPage is swapped as you have done in this sample. Thank you for the reproduction!
Comment 7 Rui Marinho 2016-06-16 17:15:53 UTC
Should be fixed in 2.3.1-pre1
Comment 8 Parmendra Kumar 2016-06-30 13:40:06 UTC
I have checked this issue with Xamarin.Forms 2.3.1-pre1 and its working fine.

Hence closing this issue.