C#•2y ago

❔ Issue with NotifyCanExecuteChangedFor from MVVM CommunityTK

The problem occurs in my view model (Avalonia MVVM), I set a variable

[ObservableProperty]
[NotifyCanExecuteChangedFor(nameof(PreCheckCommand))]
public string username;

[ObservableProperty]
[NotifyCanExecuteChangedFor(nameof(PreCheckCommand))]
public string username;

and try to run my function

[RelayCommand]
public void PreCheck() { ... }

[RelayCommand]
public void PreCheck() { ... }

whenever the text in to box is changed, it never executes though. Anyone has an idea what the issue is? This is how I use the binding in my xaml

<TextBox ... Text="{Binding Username, Mode=TwoWay}"></TextBox>

<TextBox ... Text="{Binding Username, Mode=TwoWay}"></TextBox>

27 Replies

Starlk•2y ago

Did you set the data-context for the view?

1FriendlyDoge•2y ago

Other bindings work, so yeah

Starlk•2y ago

what UI framework is this?

1FriendlyDoge•2y ago

Avalonia MVVM

Unknown User•2y ago

Message Not Public

twiner•2y ago

Notification is for properties not fields In wpf atleast

1FriendlyDoge•2y ago

Everything besides my function executing works, values update etc, so notification isnt the issue

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

And how do I get that?

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

not there for me, do I have to put it into the constructor or something? Just typing it in the class doesnt work for me, although the object exists

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

I set the var to private, didnt change anything

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

partial

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

It inherits from ObservableObject

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

Oh, it needed partial void

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

That finally fixed it, wow, 2 hours wasted :( thank you a lot for helping me out!

Unknown User•2y ago

Message Not Public

1FriendlyDoge•2y ago

Yeah, I would have never guessed this, pretty weird way to go about this in my opinion...

Unknown User•2y ago

Message Not Public

333fred•2y ago

/cc @Sergio

Sergio•2y ago

You're confusing things NotifyCanExecuteChangedFor doesn't invoke your command It just causes the command to signal its CanExecuteChanged event 🙂 This was in reply to this 😄 If you want to run code whenever that changes, just do:

partial void OnUsernameChanged(string value)
{
    // TODO: do stuff here
}

partial void OnUsernameChanged(string value)
{
    // TODO: do stuff here
}

🙂

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Issue with NotifyCanExecuteChangedFor from MVVM CommunityTK