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PO
 

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    <p>How about something along the folowing lines:</p> <pre><code>public delegate object VariableParamFactoryFunc(params object[] constructorParams); public class Factory { private Dictionary&lt;Type, VariableParamFactoryFunc&gt; _registeredTypes = new Dictionary&lt;Type, VariableParamFactoryFunc&gt;(); public void RegisterType&lt;T&gt;(VariableParamFactoryFunc factoryFunc) { _registeredTypes.Add(typeof(T), factoryFunc); } public T Resolve&lt;T&gt;(params object resolutionParams) { VariableParamFactoryFunc factoryFunc; if (_registeredTypes.TryGetValue(typeof(T), out factoryFunc)) { return (T)factoryFunc(); } else { return default(T); } } } </code></pre> <p>Then you would use it by first registering factory functions: (e.g.)</p> <pre><code>var factory = new Factory() // or you can turn it into a singleton, this is just for demonstration factory.Register&lt;IMyInterface&gt;((a, b, c) =&gt; new ConcreteImplementation(a, b, c)) factory.Register&lt;CustomClass&gt;((a, b) =&gt; new CustomClass(a, b)); </code></pre> <p>and then by actually resolving and consuming those factory functions: </p> <pre><code>IMyInterface myInterface = factory.Resolve&lt;IMyInterface&gt;(1, "string", 2.412); CustomClass customClass = factory.Resolve&lt;CustomClass&gt;("param1", 1234); </code></pre> <p>This should allow you flexibility in Resolving constructors with variable number of parameters without paying the performance penalty of Activator.CreateInstance or Reflection, but you loose in type safety since all parameters will be cast to objects and you will need to cast them back to the right type in the factory function</p> <p>Good luck!</p>
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    1. POC# pass a delegate an argument list for a class constructor in a fairly concise way
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    1. USAnastasiosyal
    1. USAnastasiosyal
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    1. COIt's a lot of start understanding and implementing, before I start, does it work with optional parameters referred to by name in the parameter list with ..., name: value, ...?
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    2. COAlso, CustomClass is not like MyType is it? I'm need to not refer to the type name at all on the line where it's used.
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    3. COThis will not work with named optional parameters and it also requires that you specify the type where you want to consume it, so I guess it is not really what you are looking for
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      1. USAnastasiosyal
 

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