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POCreating a generic typed member variable without type parameters specified on the class
 

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  1. POCreating a generic typed member variable without type parameters specified on the class
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    <p>I apologise for the unclear title, I don't really know how else to say it. I'll demonstrate with code. </p> <pre><code>public class CalculationService { private static Calculator&lt;StaticInstrument, StaticResult&gt; _staticCalculator; private static Calculator&lt;DynamicInstrument, DynamicResult&gt; _dynamicCalculator; private static readonly object IsInitializedLock = new object(); public byte[] ProcessStatic() { lock (IsInitializedLock) { _staticCalculator = new Calculator&lt;StaticInstrument, StaticResult&gt;(); } return _staticCalculator.Calculate(); } public byte[] ProcessDynamic() { lock (IsInitializedLock) { _dynamicCalculator = new Calculator&lt;DynamicInstrument, DynamicResult&gt;(); } return _dynamicCalculator.Calculate(); } } </code></pre> <p>I have many methods that are identical, except for the fact that the type parameters of the Calculator objects are different.</p> <p>The problem is, because <code>CalculationService</code> is a WCF service, it <em>cannot</em> have any type parameters. For this reason I can't simply create a static member <code>Calculator&lt;TInstrument, TResult&gt;</code>, because I cannot put type parameters on <code>CalculationService</code>.</p> <p>My <em>ideal</em> solution would be something like this:</p> <pre><code>public class CalculationService { private static Calculator&lt;TInstrument, TResult&gt; _calculator; private static readonly object IsInitializedLock = new object(); public byte[] Process&lt;TInstrument, TResult&gt;() { lock (IsInitializedLock) { _calculator = new Calculator&lt;TInstrument, TResult&gt;(); } return _calculator.Calculate(); } public byte[] ProcessStatic() { return Process&lt;StaticInstrument, StaticResult&gt;(); } public byte[] ProcessDynamic() { return Process&lt;DynamicInstrument, DynamicResult&gt;(); } } </code></pre> <p>But I can't create that <code>private static Calculator&lt;TInstrument, TResult&gt; _calculator</code> member without specifying type information on <code>CalculationService</code>, which I cannot do with WCF.</p> <p>The only way I can think to do this would be to have</p> <pre><code>private static dynamic _calculator; </code></pre> <p>Is there any other way? I would rather avoid using dynamic if possible, I'm not sure what the performance implications could be, if any.</p>
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    1. COCan you use an Interface?
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    2. COCheck this out http://stackoverflow.com/questions/509803/naming-generic-datacontracts-in-wcf
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    3. COWhy don't just work with object and unbox the data on the client side, may be with a generic wrapper that works type safe?
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