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Alternative to Activator.CreateInstance

, 25 Jan 2012 CPOL
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An alternative to Activator.CreateInstance

I found that the quickest way to instantiate an object with a default constructor through Reflection is by using the DynamicMethod class. Below is a helper class I wrote to easily instantiate an object using Reflection.

  public class DynamicInitializer
        public static V NewInstance<V>() where V : class
            return ObjectGenerator(typeof(V)) as V;
        private static object ObjectGenerator(Type type)
            var target = type.GetConstructor(Type.EmptyTypes);
            var dynamic = new DynamicMethod(string.Empty,
                          new Type[0],
            var il = dynamic.GetILGenerator();
            il.Emit(OpCodes.Newobj, target);
            var method = (Func<object>)dynamic.CreateDelegate(typeof(Func<object>));
            return method();
        public static object NewInstance(Type type)
            return ObjectGenerator(type);

You can call NewInstance using two methods: NewInstance<V>(), NewInstance(Type type).


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Dean Oliver
Software Developer BBD Johannesburg
South Africa South Africa
Bsc (Hons) Business Information Systems.
MCTS: Web Applications Development with Microsoft .NET Framework 4
MCTS: Windows Communication Foundation Development with Microsoft .NET Framework 4
MCTS: Accessing Data with Microsoft .NET Framework 4
Microsoft Certified Professional Developer Certification.

Comments and Discussions

QuestionActivator.CreateInstance() is faster than this Pinmembersobo1231-Jan-14 11:43 
GeneralRe: Ignore that, nm...that would only apply to a public construc... PinmemberAndrew Rissing26-Jan-12 4:37 
GeneralRe: Good reply, I agree in this case I'd use a "static" function... Pinmemberjohannesnestler26-Jan-12 12:52 
GeneralRe: Btw, you might want to add a default constructor constraint ... PinmemberAndrew Rissing25-Jan-12 16:49 
GeneralRe: I would disagree with statics being considered a bad practic... PinmemberAndrew Rissing25-Jan-12 10:19 
GeneralI don't see any problem with statics. If it is for performan... PinmvpPaulo Zemek25-Jan-12 10:55 
GeneralBtw, you can mark these as all static. PinmemberAndrew Rissing25-Jan-12 8:40 
GeneralRe: Its actually considered to be bad practice to have static me... PinmemberDean Oliver25-Jan-12 9:40 

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