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POItem in Model does not update in View in real-time
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  1. POItem in Model does not update in View in real-time
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    copied!<p>In my project, I have a view where a user can see ImageCollections which have subfolders and images (set up through MVVM and models). One of the features I wanted to implement is a little image holder where the next image unseen yet is displayed. I have set it up in the ImageCollection model below and it works a treat BUT: it does not update in real-time.</p> <p>What i mean is that when I do click an image as being viewed, the ShowNextToWatchImage Image does not update automatically in the view (it does show the correct new one if I exit the app and relaunch it or when I reopen the folder).</p> <p>How can I fix this?</p> <p><strong>In the model:</strong></p> <pre><code>public Image ShowNextToWatchImage { get { var found = false; Image nextToWatchImage = null; foreach (var folder in Folders) { foreach (var image in folder.Images) { if (!image.ImageHasBeenViewed) { nextToWatchImage = image; found = true; break; } nextToWatchImage = image; } if (found) { break; } } return nextToWatchImage; } set { _showNextToWatchImage = value; NotifyOfPropertyChange(() =&gt; ShowNextToWatchImage); } } </code></pre> <p><strong>EDIT:</strong></p> <p>After trying to implement Sheridan's answer, I have the following (which I am sure I balzed up in some way) which give me nothing (or at least shows nothing in the view for that item.</p> <pre><code>public class Collection : PropertyChangedBase { private Image _showNextToWatchImage; public Collection() { Folders = new List&lt;Folder&gt;(); } public Image ShowNextToWatchImage { get { return _showNextToWatchImage; } set { _showNextToWatchImage = value; UpdateNextToWatchImage(); NotifyOfPropertyChange(() =&gt; ShowNextToWatchImage); } } public void UpdateNextToWatchImage() { var found = false; Image nextToWatchImage = null; foreach (var folder in Folders) { foreach (var image in folder.Images) { if (!image.ImageHasBeenViewed) { nextToWatchImage = image; found = true; break; } nextToWatchImage = image; } if (found) { break; } } ShowNextToWatchImage = nextToWatchImage; } public List&lt;Folder&gt; Folders { get; set; } } </code></pre>
 

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