Click here to Skip to main content
Click here to Skip to main content
Alternative Tip

Tagged as

Go to top

Alternative to Activator.CreateInstance

, 26 Jan 2012
Rate this:
Please Sign up or sign in to vote.
The final solution after much debate and optimization:public class DynamicInitializer { static readonly Dictionary> list = new Dictionary>(); public static T New() where T : class { return New(typeof...

The final solution after much debate and optimization:

public class DynamicInitializer
        static readonly Dictionary<string, Func<object>> list = new Dictionary<string, Func<object>>();
        public static T New<T>() where T : class 
            return New(typeof (T)) as T;
        public static object New(Type type)
            if (list.ContainsKey(type.Name)) return list[type.Name];
            Func<object> method = Expression.Lambda<Func<object>>(Expression.Block(type, new Expression[] { Expression.New(type) })).Compile();
            list.Add(type.Name, method);
            return method();


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

GeneralRe: Perhaps it would make it completely obvious looking at the c... PinmemberAndrew Rissing26-Jan-12 6:46 
GeneralRe: If you use TryGetValue, it uses an out parameter to set the ... PinmemberAndrew Rissing26-Jan-12 6:33 
GeneralRe: thanks Andrew appreciate that. Why is it quicker though? PinmemberDean Oliver26-Jan-12 5:50 
GeneralRe: If you do update this, I'd recommend using "TryGetValue" rat... PinmemberAndrew Rissing26-Jan-12 5:13 
GeneralRe: No problem. PinmvpPaulo Zemek26-Jan-12 5:02 
GeneralI think this last version is almost OK. In fact, if you know... PinmvpPaulo Zemek26-Jan-12 3:59 
GeneralRe: Sorry Paulo I actually accidentally posted the incorrect ver... PinmemberDean Oliver26-Jan-12 4:42 
GeneralBased on a comment by nonexisto, I realized that the constra... PinmemberAndrew Rissing26-Jan-12 3:49 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Mobile
Web04 | 2.8.140916.1 | Last Updated 26 Jan 2012
Article Copyright 2012 by Dean Oliver
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid