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2013-08-27T10:47:38.220
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<p>You can use <a href="http://msdn.microsoft.com/en-US/library/system.delegate.createdelegate.aspx" rel="nofollow"><code>Delegate.CreateDelegate</code></a> and the <a href="http://msdn.microsoft.com/en-US/library/system.reflection.methodbase.getparameters.aspx" rel="nofollow"><code>GetParameters</code></a> method to do what you want.</p> <pre><code>public class RuleSet : IRuleSet { public IEnumerable<Func<SubjectA, Conclusion>> SubjectARules { get; set; } public IEnumerable<Func<SubjectB, Conclusion>> SubjectBRules { get; set; } } public static class RuleEngine { public static IEnumerable<IRuleSet> RuleSets() // removed contexts parameter for brevity { var result = from t in Assembly.GetExecutingAssembly().GetTypes() where t.GetCustomAttributes(typeof(RuleSetAttribute), true).Any() let m = t.GetMethods().Where(m => m.GetCustomAttributes(typeof(RuleAttribute)).Any()).ToArray() select new RuleSet { SubjectARules = CreateFuncs<SubjectA>(m).ToList(), SubjectBRules = CreateFuncs<SubjectB>(m).ToList() }; return result; } } // no error checking for brevity // TODO: use better variable names public static IEnumerable<Func<T, Conclusion>> CreateFuncs<T>(MethodInfo[] m) { return from x in m where x.GetParameters()[0].ParameterType == typeof(T) select (Func<T, Conclusion>)Delegate.CreateDelegate(typeof(Func<T, Conclusion>), null, x); } </code></pre> <p>Then you can use it like this:</p> <pre><code>var sa = new SubjectA(); foreach (var ruleset in RuleEngine.RuleSets()) { foreach (var rule in ruleset.SubjectARules) { var conclusion = rule(sa); // do something with conclusion } } </code></pre>
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1. POHow do I create Enumerable<Func<>> out of method instances
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1. POHow do I create Enumerable<Func<>> out of method instances
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