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POWhy can you inherit a class over project boundaries, but not its attached XAML?
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  1. POWhy can you inherit a class over project boundaries, but not its attached XAML?
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    copied!<p>(this question is a refinement of <a href="https://stackoverflow.com/questions/1493572/why-do-i-get-a-xamlparseexception-when-i-inherit-a-custom-usercontrol-in-another">my other question on this topic</a> which was a bit complicated but I really want to understand why this doesn't work so <strong>here's a more straight-forward example</strong>)</p> <p><strong>WHAT I WANT TO DO: create a simple class (no XAML) in one project which inherits a WPF UserControl (with XAML) in another project.</strong></p> <p>Here is my inheriting class in my main project:</p> <p><strong>EmployeeEditor.cs:</strong></p> <pre><code>using System.Windows.Controls; using System.Windows; using System.Windows.Media; using CoreApp; namespace TestInheritUserControl234 { class EmployeeEditor : BaseEditor { public EmployeeEditor() { TextBlock tb = new TextBlock(); tb.Text = "This was added in EmployeeEditor"; tb.Foreground = new SolidColorBrush(Colors.Blue); EditorContent.Children.Add(tb); } } } </code></pre> <p>And here is my base class in my second project, notice it has <strong>x:Name="EditorContent"</strong>:</p> <p><strong>BaseEditor.xaml:</strong></p> <pre><code>&lt;UserControl x:Class="CoreApp.BaseEditor" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&gt; &lt;StackPanel x:Name="EditorContent" Margin="5"&gt; &lt;TextBlock x:Name="TheMessage" Text="This was added in BaseEditor XAML."/&gt; &lt;/StackPanel&gt; &lt;/UserControl&gt; </code></pre> <p><strong>BaseEditor.xaml.cs:</strong></p> <pre><code>using System.Windows.Controls; namespace CoreApp { public partial class BaseEditor : UserControl { public BaseEditor() { InitializeComponent(); TextBlock tb = new TextBlock(); tb.Text = "This was added in BaseEditor code-behind."; EditorContent.Children.Add(tb); } } } </code></pre> <p>The problem is when this is run, I get the error <strong>The name 'EditorContent' does not exist in the current context</strong>.</p> <p>However, if all classes are in <strong>one project</strong>, it runs fine.</p> <p><strong>Why would it be that you can inherit a class over project boundaries, but not its attached XAML?</strong></p>
 

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