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POHow to propagate silverlight usercontrol properties to parent?
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  1. POHow to propagate silverlight usercontrol properties to parent?
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    copied!<p>I would like to have some of the properties in the custom user control to be available to the parent page. I created a small sample to illustrate what I am looking for.</p> <p>I am trying to use MVVM pattern and all the binding mechanisms to achieve it.</p> <p>USERCONTROL XAML</p> <pre><code>&lt;UserControl x:Class="TestCustomUserControl.MyControls.UserNameControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:TestCustomUserControl.ViewModels" xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"&gt; &lt;UserControl.Resources&gt; &lt;local:UserNameViewModel x:Key="TheViewModel"/&gt; &lt;/UserControl.Resources&gt; &lt;Grid x:Name="NameCtrlRoot" Background="White" DataContext="{StaticResource TheViewModel}"&gt; &lt;StackPanel&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto" /&gt; &lt;ColumnDefinition /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition /&gt; &lt;RowDefinition /&gt; &lt;RowDefinition /&gt; &lt;RowDefinition /&gt; &lt;RowDefinition /&gt; &lt;/Grid.RowDefinitions&gt; &lt;TextBlock Grid.Row="0" Grid.Column="0" Text="First Name:" /&gt; &lt;TextBlock Grid.Row="1" Grid.Column="0" Text="Last Name: "/&gt; &lt;TextBox Grid.Row="0" Grid.Column="1" x:Name="txtFirstName" Text="{Binding FirstName, Mode=TwoWay}"&gt; &lt;i:Interaction.Behaviors&gt; &lt;!-- This behavior updates the binding after a specified delay instead of the user having to lose focus on the TextBox. --&gt; &lt;local:TextChangedDelayedBindingBehavior RefreshTimeMilliseconds="750" /&gt; &lt;/i:Interaction.Behaviors&gt; &lt;/TextBox&gt; &lt;TextBox Grid.Row="1" Grid.Column="1" x:Name="txtLastName" Text="{Binding LastName, Mode=TwoWay}"&gt; &lt;i:Interaction.Behaviors&gt; &lt;!-- This behavior updates the binding after a specified delay instead of the user having to lose focus on the TextBox. --&gt; &lt;local:TextChangedDelayedBindingBehavior RefreshTimeMilliseconds="750" /&gt; &lt;/i:Interaction.Behaviors&gt; &lt;/TextBox&gt; &lt;TextBlock Grid.Row="3" Grid.Column="0" Text="fullname inside control:" /&gt; &lt;TextBlock Grid.Row="3" Grid.Column="1" Text="{Binding FullName}" /&gt; &lt;Border Height="1" Background="Black" Grid.Column="2" Grid.Row="4" /&gt; &lt;/Grid&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; </code></pre> <p></p> <p>the above Usercontrol is binded to the following VIEWMODEL</p> <pre><code>public class BaseViewModel : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged(string propName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propName)); } } public class UserNameViewModel : BaseViewModel { private String _firstName; public String FirstName { get { return _firstName; } set { _firstName = value; NotifyPropertyChanged("FirstName"); OnNameChange(); } } private String _lastName; public String LastName { get { return _lastName; } set { _lastName = value; NotifyPropertyChanged("LastName"); OnNameChange(); } } private void OnNameChange() { FullName = String.Format("{0} {1}", FirstName, LastName); } public String _fullName; public String FullName { get { return _fullName; } set { _fullName = value; NotifyPropertyChanged("FullName"); } } } </code></pre> <p>Consumer Page that uses the above USERCONTROL</p> <pre><code>&lt;navigation:Page xmlns:my="clr-namespace:TestCustomUserControl.MyControls" x:Class="TestCustomUserControl.Views.ConsumeName" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation" d:DesignWidth="640" d:DesignHeight="480" Title="ConsumeName Page"&gt; &lt;Grid x:Name="LayoutRoot"&gt; &lt;StackPanel&gt; &lt;my:UserNameControl x:Name="MyNameControl"/&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="10" /&gt; &lt;RowDefinition /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto"/&gt; &lt;ColumnDefinition /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Row="1" Grid.Column="0" Text="Full Name in Parent: " /&gt; &lt;TextBlock Grid.Row="1" Grid.Column="1" Text="{Binding FullName, ElementName=MyNameControl}"/&gt; &lt;/Grid&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; </code></pre> <p></p> <p>Here is my question now, If you look at the view model associated with user control, it has a property called FullName and I would like that to be exposed via Usercontrol, so that I can access it from the consuming page. Its like consuming page want to access some of the properties of usercontrol. I am not quite sure as to how that can be acheived. I would like to stick with MVVM pattern.</p>
 

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