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POWPF DependencyProperty not updating in WPF UserControl (ElementHost)
 

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  1. POWPF DependencyProperty not updating in WPF UserControl (ElementHost)
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    <p>I build up a Office 2010 Word Add In, added a Windows Forms Element to it and there in an ElementHost object containing my WPF. </p> <p>That's the problem: I got the problem, that common properties (DP's) defined in the Xaml code and set in the ViewModel implementation (see code below) are not updated, even if I can't find any wrong code while debugging. This applies only to the properties I got, furthermore i got some ObservableCollection&lt;> List's which are updated without any problems. Got anybody an idea? I red that I may define the properties by myself within the Code using something like this:</p> <pre><code>public static readonly DependencyProperty DataSourceProperty = DependencyProperty.Register("DataSource",typeof(string),typeof(usercontrol1)); </code></pre> <p>But this does not work too (I just added this line for example into the code-behind file of the Xaml file - and left anything else at it is)</p> <p>My code looks this way:</p> <p>Constructor of the Forms Element (it's actually private because I implemented it as Singleton):</p> <pre><code>private Sidebar() { InitializeComponent(); this.DoubleBuffered = true; _wpfHost = new ElementHost(); _wpfHost.Dock = DockStyle.Fill; _wpfUserControl = new WPFUI(); _wpfHost.Child = _wpfUserControl; this.Controls.Add(_wpfHost); } </code></pre> <p>Furthermore I created an underlying ViewModel and set this as DataContext Property of the WPFUI like this (it's also a Singleton implementation because I wanted to access in a further implementation the same instance from several places, but this does not come into the game at this time):</p> <pre><code>public WPFUI() { InitializeComponent(); this.DataContext = myViewModel.GetInstance(); } </code></pre> <p>My ViewModel properties are defined and used this way:</p> <pre><code>public ObservableCollection&lt;myListViewItem&gt; PeopleEntityResultObjects { get; private set; } private string _NumberOfPeople; public string NumberOfPeople { get { return _NumberOfPeople; } set { SetField(ref _NumberOfPeople, value, () =&gt; NumberOfPeople); } } </code></pre> <p>And finally the Xaml looks like this:</p> <pre><code>&lt;TabControl&gt; &lt;TabItem&gt; &lt;TabItem.Header&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;TextBlock Text=" People "/&gt; &lt;TextBlock Text="{Binding Path=NumberOfPeople}"/&gt; &lt;/StackPanel&gt; &lt;/TabItem.Header&gt; &lt;ScrollViewer x:Name="PeopleListScrollViewer"&gt; &lt;ListView Name="PeopleListView" ItemsSource="{Binding Path=PeopleEntityResultObjects, Mode=OneWay}" IsSynchronizedWithCurrentItem="True"&gt; . . . &lt;/ListView&gt; &lt;/ScrollViewer&gt; &lt;/TabItem&gt; &lt;/TabControl&gt; </code></pre> <p>Why is my ObservableCollection&lt;> List updating but not the bound properties like </p> <pre><code>&lt;TextBlock Text="{Binding Path=NumberOfPeople}"/&gt; </code></pre> <p>? Can anybody guess, or i'm missing some basic property definition? (in a wpf application it is working that way).</p> <p><em>EDIT</em></p> <p>SetField() implementation:</p> <pre><code>protected virtual void OnPropertyChanged&lt;T&gt;(Expression&lt;Func&lt;T&gt;&gt; selectorExpression) { if (selectorExpression == null) throw new ArgumentNullException("selectorExpression"); MemberExpression body = selectorExpression.Body as MemberExpression; if (body == null) throw new ArgumentException("The body must be a member expression"); OnPropertyChanged(body.Member.Name); } protected virtual void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } protected bool SetField&lt;T&gt;(ref T field, T value, Expression&lt;Func&lt;T&gt;&gt; selectorExpression) { if (EqualityComparer&lt;T&gt;.Default.Equals(field, value)) return false; field = value; OnPropertyChanged(selectorExpression); return true; } </code></pre> <p>Regards, Thomas</p>
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