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    UPDATE: The correct error message is: 'T': cannot provide arguments when creating an instance of a variable Commented May 8, 2009 at 15:11
  • That's because you're not using a blank constructor, you're passing an argument to it of object. There's no way it can handle that without specifying that the generic Type has a new(object) parameter. Commented May 8, 2009 at 15:14
  • Then you'll need to either: 1. Use reflection 2. Pass the parameter into an initialization method instead of the constructor, where the initialization method belongs to an interface that your type implements and which is included in the where T: ... declaration. Option 1 is the lowest impact for the rest of your code, but option 2 provides compile time checking. Commented May 8, 2009 at 15:14
  • Don't use reflection! There are other ways as outlined in other answers that get you the same effect. Commented May 8, 2009 at 15:17
  • @Garry - I'd agree that reflection isn't necessarily the best approach, but it does allow you to achieve what's required with minimal change to the rest of the code base. That said, I do much prefer the factory delegate approach from @JaredPar. Commented May 8, 2009 at 15:22