WPF and ViewModel Property Access?

Make sure your ViewModel implements INotifyPropertyChanged.

Make sure your ViewModel implements INotifyPropertyChanged. For example... /// /// Sample ViewModel. /// public class ViewModel : INotifyPropertyChanged { #region Public Properties /// /// Timestamp property /// public DateTime Timestamp { get { return this.

_Timestamp; } set { if (value! = this. _Timestamp) { this.

_Timestamp = value; // NOTE: This is where the ProperyChanged event will get raised // which will result in the UI automatically refreshing itsefl. OnPropertyChanged("Timestamp"); } } } #endregion #region INotifyPropertyChanged Members /// /// Event /// public event PropertyChangedEventHandler PropertyChanged; /// /// Raise the PropertyChanged event. /// protected void OnPropertyChanged(string propertyName) { if (this.

PropertyChanged! = null) { this. PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } #endregion #region Private Fields private DateTime _Timestamp; #endregion }.

Works great, thanks! – jlafay Nov 18 '10 at 21:59.

Something like: A little depending on if your tabcontrol's itemssource is databound or not.

Using SelectedContent.DataContext. Timestamp worked somewhat. It doesn't update unless I select another tab and then select that tab again.

What could I do to update the textblock when that property changes? – jlafay Nov 18 '10 at 20:52 Do all your ViewModels implement INotifyPropertyChanged? – ChrisNel52 Nov 18 '10 at 21:01 @Chris, no they don't.

I wasn't aware of that interface, I'm new to WPF :) Looks like I have some more reading to do. – jlafay Nov 18 '10 at 21:13 If your ViewModels implement INotifyPropertyChanged, then whenever the Timestamp property changes in your ViewModel the PropertyChanged event will be raised. WPF will recognize the PropertyChanged event and automatically update the UI for you.

– ChrisNel52 Nov 18 '10 at 21:19 @Chris, could you post an answer with the example implemented methods implemented to raise an event for my Timestamp property? – jlafay Nov 18 '10 at 21:24.

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