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Alternative to Activator.CreateInstance

, 26 Jan 2012
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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();
        }
    }

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

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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 

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