CODEWITHSUNDEEP
c#mvvmwindows-phonemvvm-light
rdon
rdon

Reputation: 201

MVVM Light - RaisePropertyChanged not working

I have a ViewModel that is bound to one page called SettingsView. In this page i have some properties like so:

public string SettingsHeaderTitle { get { return AppResources.settings_header_title; } }

I have one button that navigates to another page where we can change language and then goes back to SettingsPage. I had implemented a command like so:

public void UpdateView() 
{
    RaisePropertyChanged(string.Empty);
}

My problem is that when I call this command from on Loadedd or NavigatedTo events nothing happens. Then I added a button to call this command (for debug purposes) and the Page is updated successfully.

What am I doing wrong?

Upvotes: 1

Views: 6354

Answers (1)

reggaeguitar
reggaeguitar

Reputation: 1804

You need to implement INotifyPropertyChanged on your ViewModels like so

public class SelectionItem<T> : INotifyPropertyChanged
{
    private AppliesTo _appliesTo;
    public AppliesTo AppliesTo
    {
        get { return _appliesTo; }
        set
        {
            _appliesTo = value;
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("AppliesTo"));
        }
    }
}

EDIT: I just noticed you're using MVVM Light, then it becomes even easier, in your ViewModels inherit from ViewModelBase and make your property like this:

private bool _isComparisonRun;
public bool IsComparisonRun
{
    get { return _isComparisonRun; }
    set
    {
        if (_isComparisonRun == value) return;
        _isComparisonRun = value;
        RaisePropertyChanged(() => IsComparisonRun);
    }
}

Upvotes: 1

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