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POHow to update multiple instances of user control using MVVM databinding WPF?
 

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  1. POHow to update multiple instances of user control using MVVM databinding WPF?
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    <p>I have created a <code>UserControl</code> with a <code>ProgressBar</code> and a <code>Label</code>. </p> <pre><code>&lt;Label Content="{Binding ElementName=UserControl, Path=StatusProperty}" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="76,0,0,32" Name="lblStatus" VerticalAlignment="Bottom" Grid.RowSpan="2" /&gt; &lt;ProgressBar Grid.Row="2" Height="20" HorizontalAlignment="Left" Margin="12,3,0,0" Name="pbCheckProgress" Style="{DynamicResource ProgressBarStyle}" Maximum="{Binding ElementName=UserControl, Path=MaximumProperty}" Minimum="{Binding ElementName=UserControl, Path=MinimumProperty}" Value="{Binding ElementName=UserControl, Path=ValueProperty}" VerticalAlignment="Top" Width="156" /&gt; </code></pre> <p>Then I have created the following <code>DependencyProperties</code>:</p> <pre><code>// Dependency Properties for labels public static readonly DependencyProperty StatusProperty = DependencyProperty.Register("Status", typeof(string), typeof(UserControl1), new FrameworkPropertyMetadata("", FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)); // Dependency Properties for progress bar properties public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register("Minimum", typeof(double), typeof(UserControl1), new FrameworkPropertyMetadata(0.0d, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)); public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register("Maximum", typeof(double), typeof(UserControl1), new FrameworkPropertyMetadata(0.0d, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)); public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(double), typeof(UserControl1), new FrameworkPropertyMetadata(0.0d, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)); </code></pre> <p>Now I would like to create multiple instances of this <code>UserControl</code> in the same page and update the <code>ProgressBar</code> from code behind using MVVM. But I could not figure this out. Do I need to have a ViewModel for the <code>UserControl</code> so that every instance will have its own copy of ViewModel.</p> <p>Is there a way to update all the instances from the page ViewModel?</p> <p>Thanks &amp; Regards, Bharat</p>
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    1. COElementName should point to an x:Name attribute value, not an element type (UserControl, TextBox, etc)
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