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POHow to "wrap" implementation in C#
 

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  1. POHow to "wrap" implementation in C#
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    <p>I have these classes in C# (.NET Framework 3.5) described below:</p> <pre><code>public class Base { public int State {get; set;} public virtual int Method1(){} public virtual string Method2(){} ... public virtual void Method10(){} } public class B: Base { // some implementation } public class Proxy: Base { private B _b; public Proxy(B b) { _b = b; } public override int Method1() { if (State == Running) return _b.Method1(); else return base.Method1(); } public override string Method2() { if (State == Running) return _b.Method2(); else return base.Method2(); } public override void Method10() { if (State == Running) _b.Method10(); else base.Method10(); } } </code></pre> <p><strong>I want to get something this</strong>:</p> <pre><code>public Base GetStateDependentImplementation() { if (State == Running) // may be some other rule return _b; else return base; // compile error } </code></pre> <p><strong>and my Proxy's implementation will be</strong>: </p> <pre><code>public class Proxy: Base { ... public override int Method1() { return GetStateDependentImplementation().Method1(); } public override string Method2() { return GetStateDependentImplementation().Method2(); } ... } </code></pre> <p>Of course, I can do this (aggregation of base implementation):</p> <pre><code> public RepeaterOfBase: Base // no any overrides, just inheritance { } public class Proxy: Base { private B _b; private RepeaterOfBase _Base; public Proxy(B b, RepeaterOfBase aBase) { _b = b; _base = aBase; } } ... public Base GetStateDependentImplementation() { if (State == Running) return _b; else return _Base; } ... </code></pre> <p>But instance of Base class is very huge and I have to avoid to have other additional copy in memory.</p> <p>So I </p> <ul> <li>have to simplify my code</li> <li>have to "wrap" implementation</li> <li>have to avoid a <em>code</em> duplication</li> <li>have to avoid aggregation of any <em>additional instance of Base class</em> (duplication)</li> </ul> <p>Is it possible to reach these goals?</p>
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