Changing Visibility with x:Bind not updating with MVVM

Question

Since the Anniversary Update (Build 14383 / 14393) you should be able to toggle the visibility of XAML elements without using a converter, like this:

<TextBlock Text="I'm not visible!" Visibility="{x:Bind IsVisibleFalse}" />
<TextBlock Text="I'm visible!" Visibility="{x:Bind IsVisibleTrue}" />

I was trying this in my project, minimum target version set to Windows 10 Anniversary Edition. Unfortunately I did not get it to work.

This code works just fine:

<StackPanel Visibility="{x:Bind ViewModel.IsUnlocked, 
    Converter={StaticResource BoolToVisibilityConverter}, Mode=TwoWay}">

This one doesn't (no error on compile, just does not show up when the bool value changes):

<StackPanel Visibility="{x:Bind ViewModel.IsUnlocked}>

I suspect the Mode="TwoWay" to be the issue, as you can't set it "when the binding expression ends with a cast". This code does not work as well:

<StackPanel Visibility="{x:Bind ViewModel.IsUnlocked,
   Converter={StaticResource BoolToVisibilityConverter}>

So my question is: Am I misssing something or is this not working yet in a MVVM-Scenario and only with code-behind?

score 6 · Accepted Answer · answered Feb 20 '17 at 09:47

6

The default Mode is OneTime, which renders your code not working. I suggest you use OneWay, which should be usable upon casting.

answered Feb 20 '17 at 09:47

Dante May Code

this question has a more detailed answer as well: http://stackoverflow.com/questions/33070705/with-compiled-bindings-xbind-why-do-i-have-to-call-bindings-update – Thomas Feb 20 '17 at 09:49
@Thomas What a coincidence for the same-minute answer. – Dante May Code Feb 20 '17 at 09:50

score 0 · Answer 2 · answered Feb 20 '17 at 09:47

0

Turns out x:Bind defaults to Mode=OneTime - I mistakenly thought it's Mode=OneWay. So this does actually work:

<StackPanel Visibility="{x:Bind ViewModel.IsUnlocked, Mode=OneWay}>

answered Feb 20 '17 at 09:47

Thomas

2 Answers2