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    <p>There is but it's not a simple solution. Essentially you create a dynamic method and then create a delegate from that and use it.</p> <pre><code>public static BaseBuilder Create(Type builderType, HttpContextBase httpContext, PathDataDictionary pathData) { if (!builderType.IsSubclassOf(baseBuilderType)) return null; BuilderConstructorDelegate del; if (builderConstructors.TryGetValue(builderType.FullName, out del)) return del(httpContext, pathData); DynamicMethod dynamicMethod = new DynamicMethod("CreateBaseBuilderInstance", builderType, constructorMethodArgs, builderType); ILGenerator ilGenerator = dynamicMethod.GetILGenerator(); ilGenerator.Emit(OpCodes.Ldarg_0); ilGenerator.Emit(OpCodes.Ldarg_1); ilGenerator.Emit(OpCodes.Newobj, builderType.GetConstructor(constructorMethodArgs)); ilGenerator.Emit(OpCodes.Ret); del = (BuilderConstructorDelegate)dynamicMethod.CreateDelegate(typeof(BuilderConstructorDelegate)); builderConstructors.TryAdd(builderType.FullName, del); return del(httpContext, pathData); } </code></pre> <p>Here is some code I use in the <a href="http://www.matlus.com/2010/11/builder-for-aspnet/" rel="nofollow">Builder for ASP.NET</a></p> <p>framework in the BuilderFactory.</p> <p>If it's not clear in the code, you should know that once you have a delegate then that delete is stored in the dictionary called builderConstructors in the code above. So the next time the factory simply uses the delegate.</p> <p>In this particular case the class requires two parameters in its constructor. If you're using the default constructor for your classes things are a little simpler.</p> <p><a href="http://www.matlus.com/2010/11/high-performance-class-factory/" rel="nofollow">High Performance Class Factory</a></p>
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    1. POC# String to Object without using Reflection
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    1. USShiv Kumar
    1. USShiv Kumar
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    1. COThis is also using reflection.
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      1. USRex M
    2. COThis is a worthwhile answer. While it uses classes under System.Reflection.Emit, this is a one time cost. The actual execution does not make reflection calls.
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      1. USJason Kresowaty
    3. COActivator.CreateInstance is not dissimilar, in that it also caches the ctor method call after it's been resolved the first time.
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