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POHow can I type safely load code from multiple sources that deal with an unknown type?
 

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  1. POHow can I type safely load code from multiple sources that deal with an unknown type?
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    <p>I need to be able to, at runtime, load two classes that share an unknown type, like this:</p> <pre><code>interface IProducer&lt;out A&gt; { public A CookOne(); } interface IConsumer&lt;in A&gt; { public void EatOne(A food); } </code></pre> <h2>&lt;edit&gt;</h2> <p>Here are two example classes</p> <pre><code>class IntChef : IProducer&lt;int&gt; { private int _counter = 0; public int CookOne() { return counter++; } } class IntCustomer : IConsumer&lt;int&gt; { public void EatOne(int food) { Console.WriteLine("I ate a {0}", food); } } </code></pre> <p>The goal is to load an implementation of each interface, sharing the type they communicate via, and create a new object that doesn't care how the two loaded types communicate.</p> <h2>&lt;/edit&gt;</h2> <p>The entire list of possible involved types can't be known at compile time because they don't exist yet. The software that uses these types is something like this:</p> <pre><code>interface IStrategyFactory&lt;A&gt; { public IStrategy MakeAStrategy(IProducer&lt;A&gt; producer, IConsumer&lt;A&gt; consumer); } interface IStrategy { public void DoSomething();; } </code></pre> <p>How can I load external binary code (from two different sources) and pass them to the factory (or wherever else) in a type-safe manner, so that I can't, for example, pass in a IProducer and an IConsumer?</p> <p>The best resource I can find on this so far is <a href="http://codebetter.com/blogs/glenn.block/archive/2009/08/20/open-generic-support-in-mef.aspx" rel="nofollow noreferrer">http://codebetter.com/blogs/glenn.block/archive/2009/08/20/open-generic-support-in-mef.aspx</a></p> <p>Optimally the program itself would have types like this:</p> <pre><code>interface IStrategyFactory&lt;A&gt; { public IStrategy MakeAStrategy(IProducer&lt;A&gt; producer, IConsumer&lt;A&gt; consumer); } interface IStrategy { public void DoSomething();; } </code></pre>
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