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  1. using System;
  2. using System.Collections.Generic;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 		string s = Factory.Instance.Create<string>();
  9. 		Console.WriteLine(s);
  10. 		int i = Factory.Instance.Create<int>();
  11. 		Console.WriteLine(i);
  12. 	}
  13. }
  14.  
  15. class Factory {
  16.     private readonly IDictionary<Type,Func<object>> registry = new Dictionary<Type,Func<object>>();
  17.     private static Factory instance;
  18.     public static Factory Instance {
  19.         get {
  20.         	if (instance != null)
  21.         	    return instance;
  22.         	var f = new Factory();
  23.         	f.Register<string>(() => "hello");
  24.         	f.Register<int>(() => 123);
  25.         	instance = f;
  26.         	return instance;
  27.         }
  28.     }
  29.     public void Register<T>(Func<T> make) {
  30.         registry.Add(typeof(T), () => (object)make());
  31.     }
  32.     public T Create<T>() {
  33.         return (T)registry[typeof(T)]();
  34.     }
  35. }
Success #stdin #stdout 0.03s 14532KB
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stdin
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Standard input is empty
stdout
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hello
123
https://ideone.com/zXa2wW
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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