Practical advantage of generics vs interfaces

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  • Calling a method through an interface is slower than calling it directly on the concrete type
  • If the type implementing IFoo is a value type, the non-generic version will box the value of the parameter, and boxing can negatively affect performance (especially if you call this method very often)
  • If your method returns a value, the generic version can return a T rather than a IFoo, which is convenient if you need to call a method of T on the result

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