Hello,
I created a page with a simple form, having some entries and some SfComboBox as user input. Entries values and SfComboBox SelectedItem properties are binded to a ViewModel in MVVM way.
I added a "Reset" button that should clear the inputs: strings are correctly cleared, but if I choose an item in one of my SfComboBox elements the application crashes and no exception is raised by Visual Studio.
Here's an example of the XAML code:
<combobox:SfComboBox x:Name="ComboboxTipiDomande" Margin="0" DataSource="{Binding ListaTipiDomande}" IsEnabled="{Binding IsEnabled}" SelectedItem="{Binding ItemSelectedTipiDomande, Mode=TwoWay}" Style="{StaticResource ComboBoxDetailStyle}" Watermark="{i18n:Translate Text=StringTipoDomanda}" />
<combobox:SfComboBox Margin="0" DataSource="{Binding ListaNumeroNote}" IsEnabled="{Binding IsEnabled}" SelectedItem="{Binding ItemSelectedNumeroNote, Mode=TwoWay}" Style="{StaticResource ComboBoxDetailStyle}" Watermark="{i18n:Translate Text=StringNumeroNote}" />
Here's the reset command:
private void ExecuteResetCommand()
{
IsEnabled = true;
Testo = string.Empty;
ItemSelectedTipiDomande = null;
Valori = string.Empty;
IsSelectedAttributo = false;
Requisito = string.Empty;
ItemSelectedDomande = null;
ItemSelectedNumeroNote = ListaNumeroNote.FirstOrDefault();
PlaceholderNote = string.Empty;
}
If I set the SelectedItem to the first item of a collection of strings (for
example the italic line of code), no error occurs. If I set the
SelectedItem to null for a collection of objects (for example the bold line aof code), then the application crashes. Here's an exceprt of the stacktrace:
Native Crash Reporting
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
Basic Fault Adddress Reporting
Memory around native instruction pointer (0x72cb8ff678):0x72cb8ff668 00 1c 40 b9 c0 03 5f d6 fd 7b bf a9 fd 03 00 91 ..@..._..{......
0x72cb8ff678 08 20 40 b9 a8 00 c8 37 88 01 e0 37 00 00 40 f9 . @....7...7..@.
0x72cb8ff688 fd 7b c1 a8 c0 03 5f d6 60 08 00 b0 01 0a 00 f0 .{...._.`.......
0x72cb8ff698 03 0a 00 f0 00 24 06 91 21 80 08 91 63 8c 0a 91 .....$..!...c...
No native Android stacktrace (see debuggerd output).Managed Stacktrace:06-13 18:07:07.461 E/mono-rt (25057): /proc/self/maps:06-13 18:07:07.461 E/mono-rt (25057): 12c00000-52c00000 rw-p 00000000 00:01 770 /dev/ashmem/dalvik-main space (region space) (deleted)06-13 18:07:07.461 E/mono-rt (25057): 6f309000-6f5b1000 rw-p 00000000 103:09 57577 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6f5b1000-6f6b7000 rw-p 00000000 103:09 57579 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6f6b7000-6f701000 rw-p 00000000 103:09 57581 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6f701000-6f737000 rw-p 00000000 103:09 57582 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6f737000-6f73b000 rw-p 00000000 103:09 57584 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6f73b000-6f77e000 rw-p 00000000 103:09 57587 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6f77e000-6f7b9000 rw-p 00000000 103:09 57589 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6f7b9000-6ffa6000 rw-p 00000000 103:09 57591 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 6ffa6000-70032000 rw-p 00000000 103:09 57596 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 70032000-7003b000 rw-p 00000000 103:09 57598 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 7003b000-70044000 rw-p 00000000 103:09 57600 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 70044000-70068000 rw-p 00000000 103:09 57602 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 70068000-70090000 rw-p 00000000 103:09 57604 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 70090000-70091000 rw-p 00000000 103:09 57606 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 70091000-70094000 rw-p 00000000 103:09 57607 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.461 E/mono-rt (25057): 70094000-7011f000 rw-p 00000000 103:09 57610 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.462 E/mono-rt (25057): 7011f000-70146000 rw-p 00000000 103:09 57612 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.462 E/mono-rt (25057): 70146000-7017f000 rw-p 00000000 103:09 57614 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.462 E/mono-rt (25057): 7017f000-70181000 rw-p 00000000 103:09 57617 /data/dalvik-cache/arm64/system@[email protected]06-13 18:07:07.462 E/mono-rt (25057): 70181000-70182000 rw-p 00000000 103:09 57619 /data/dalvik-cache/arm64/system@[email protected] 06-13 18:07:07.462 E/mono-rt (25057): 70182000-70188000 rw-p 00000000 103:09 57621 /data/dalvik-cache/arm64/system@[email protected] ...
06-13 18:07:07.466 F/libc (25057): Fatal signal 11 (SIGSEGV), code 1, fault addr 0x20 in tid 25057 (ca.AuditManager)
How can I investigate and solve the problem?
Thanks in advance,
Matteo
