Binding TextBlock text not update except Initial

Question

I'm new on Caliburn.Micro.

The Binding a text on TextBlock.

The text of TextBlock is changed on start up or initialize on ViewModel,

But it would not change in fired function.

I don't know why for a day.

I need any help badly.

Here is code what i wrote.

In View

<TextBlock Grid.Row="0" FontSize="72" Foreground="White" 
    HorizontalAlignment="Center"  VerticalAlignment="Center"
    x:Name="DisplayedPhoneNumber"/>

In ViewModel

    //! Scren Binding.
    public string DisplayedPhoneNumber { get; set; } ="0103214321";

When i press a button on view, i call a function like this,

In View

<Border  Style="{StaticResource StyleNumberKeyBorder}">
    <Button Content="1" Style="{StaticResource StyleNumberKeyButton}"
        cal:Message.Attach="[Event Click]=[Action CmdNumberClick(1)]"/>
</Border>

In ViewModel, CmdNumberClick function like this...

    public void CmdNumberClick(string pressed_number)
    {
        DisplayedPhoneNumber = "plz change...";
    }

I check the fired function, and checked DisplayedPhoneNumber is changed, But TextBlck was not changed.

Please help.

Implement [INotifyPropertyChanged](https://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=vs.110).aspx). — sharp, Jan 24 '18 at 08:08

score 1 · Answer 1 · answered Jan 27 '18 at 06:45

1

public string DisplayedPhoneNumber { get; set; }

needs to be

private string _displayedPhoneNumber;
public string DisplayedPhoneNumber{
   get{ return _displayedPhoneNumber;}
   set{
      _displayedPhoneNumber = value;
      NotifyOfPropertyChanged(() => DisplayedPhoneNumber);
    }
}

Associated ViewModel has to inherit PropertyChangedBase or a base class that derives INotifyPropertyChanged;

answered Jan 27 '18 at 06:45

mvermef

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Could use nameof instead of ()=>DisplayedPhoneNumber while using NotifyOfPropertyChange. NotifyOfPropertyChanged(nameof(DisplayedPhoneNumber)); – Anu Viswan Feb 15 '18 at 05:15
considering that didn't exist in the framework till recently the syntax of my set is correct for the implementation CM uses. – mvermef Feb 15 '18 at 05:23

Binding TextBlock text not update except Initial

1 Answers1