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POHow can I have my DebuggerTypeProxy target class inherit from base proxies?
 

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  1. POHow can I have my DebuggerTypeProxy target class inherit from base proxies?
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    <p><strong>Question:</strong> I'm looking for a way to simplify the construction of debugger type proxies for inherited classes. So, when debugging a class that inherits from another, I should see the properties of both side-by-side: the base properties of the base class, plus the new properties of the parent class.</p> <p>Here's what I've tried so far:</p> <ol> <li><code>NewA</code>'s type proxy inherits from that of <code>A</code>. Properties don't show side-by-side; base properties are umbrella'd [sic] under <code>Base</code>. <sup>*****</sup></li> <li>Including an <code>A</code> property in <code>NewA</code> that just casts the current <code>NewA</code> to <code>A</code>, with <code>[DebuggerBrowsable(RootHidden)]</code>: Visual Studio hangs :( </li> </ol> <p>I know that I could just add properties for the base class into <code>NewA</code>'s proxy, but I'm trying to avoid this. It's too much work for classes with many properties.</p> <hr/> <p><strong>Explanation:</strong></p> <p>I'm using the <code>DebuggerTypeProxy</code> attribute on some of my classes so I can control how the class looks when browsed during debugging. For example:</p> <pre><code>public class A { private String _someField; public String SomeField { get {return _someField;} } } </code></pre> <p>By default, the tooltip debugging info shows as:</p> <p><img src="https://i.stack.imgur.com/1iuJe.png" alt="enter image description here"></p> <p>... so I use a DebuggerTypeProxy to hide the backing field:</p> <pre><code>[DebuggerTypeProxy(typeof(AProxy))] public class A { // ... internal class AProxy { A _a; AProxy (A a){ _a = a; } public String SomeField { get {return _a.SomeField;} } } } </code></pre> <p>... all is right with the world:</p> <p><img src="https://i.stack.imgur.com/TNgYx.png" alt="enter image description here"></p> <hr/> <p>Now, I create a class that inherits from A.</p> <pre><code>public class NewA : A { private String _anotherField; public String AnotherField { get {return _anotherField;} } } </code></pre> <p>Unfortunately, when debugging this class, Visual Studio uses the base type proxy (from <code>A</code>). This means we can see the base <code>SomeField</code> property, but our new <code>AnotherField</code> property is hidden (unless you expand <code>Raw View</code>, of course):</p> <p><img src="https://i.stack.imgur.com/W22tD.png" alt="enter image description here"></p> <p>Removing the type proxy from base <code>A</code> results in <code>AnotherField</code> showing, but not <code>SomeField</code>.</p> <hr/> <p><strong><sup>*</sup> Failed attempt #1</strong></p> <pre><code>/// &lt;summary&gt; /// The base class /// &lt;/summary&gt; [DebuggerTypeProxy(typeof(AProxy))] public class A { private String _someField; public String SomeField { get { return _someField; } } protected class AProxy { A _a; protected AProxy(A a) { _a = a; } String SomeField { get { return _a.SomeField; } } } } /// &lt;summary&gt; /// Parent class /// &lt;/summary&gt; [DebuggerTypeProxy(typeof(NewAProxy))] public class NewA : A { private String _anotherField; public String AnotherField { get { return _anotherField; } } // Inherit base type proxy, in an effort to display base properties // side-by-side with AnotherField: Doesn't work. protected class NewAProxy : A.AProxy { NewA _newA; protected NewAProxy(NewA newA) : base(newA) { _newA = newA; } public String AnotherField { get { return _newA.AnotherField; } } } } </code></pre> <p>Result:</p> <p><img src="https://i.stack.imgur.com/xGGKx.png" alt="enter image description here"></p> <p>Still doesn't work. Base properties are not placed side-by-side with the new properties.</p>
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