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POOverride a UseControl's library
 

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  1. POOverride a UseControl's library
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    <p>I would like to develope a WPF User Control Library that uses a Class Library with a member function that can be over-ridden . I’m using C# 4.0 and VS 2010.</p> <p>My test class library looks like:</p> <pre><code>using System.Diagnostics; namespace MyLibrary { public class Foo { virtual public void Bar() { Debug.WriteLine(" Hi from MyLibrary, class Foo, method Bar."); } } } </code></pre> <p>My WPF User Control looks like:</p> <pre><code>using System.Windows.Controls; using System.Diagnostics; using MyLibrary; namespace MyUserControl { public partial class UserControl1 : UserControl { public UserControl1() { InitializeComponent(); Debug.WriteLine("MyUserControl: "); var foo = new Foo(); foo.Bar(); } } } </code></pre> <p>I have built a WPF Application called ProgramA, and it looks like:</p> <pre><code>using System; using System.Diagnostics; using System.Windows; namespace ProgramA { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } } } </code></pre> <p>When debugging ProgramA, you will see:</p> <pre><code>MyUserControl: Hi from MyLibrary, class Foo, method Bar. </code></pre> <p>in the debug Output window. So far, so good.</p> <p>I have also built ProgramB to try to override the Bar method of MyLibrary. ProgramB looks like:</p> <pre><code>using System.Windows; namespace ProgramB { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } } } </code></pre> <p>The XML for both ProgramA and ProgramB contains a reference to MyUserControl:</p> <pre><code>&lt;Window x:Class="ProgramB.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" xmlns:my="clr-namespace:MyUserControl;assembly=MyUserControl"&gt; &lt;Grid&gt; &lt;my:UserControl1 Name="userControl11" HorizontalAlignment="Left" VerticalAlignment="Top" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>I have added a Class to ProgramB's project called NewFoo.cs, and it looks like:</p> <pre><code>using System.Diagnostics; using MyLibrary; namespace ProgramB { class NewFoo : MyLibrary.Foo{ override public void Bar() { Debug.WriteLine(" Hi from ProgramB Foo, method Bar."); } } } </code></pre> <p>ProgramB compiles and runs, but the output is:</p> <pre><code>MyUserControl: Hi from library Foo, method Bar. </code></pre> <p>The override did not work.</p> <p>Here is the problem. The Namespace for ProgramB’s Foo method is ProgramB, and hence it does not override the Bar method of MyLibrary.</p> <p>Is there a way ProgramB can override the Bar method used by MyUserControl?</p> <p>Any help or suggestions will be greatly appreciated. Charles</p>
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    1. USJoe White
    1. USCBrauer
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    1. COMaybe the [factory pattern](http://en.wikipedia.org/wiki/Factory_method_pattern) might help you.
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