Why doesn't IList support AddRange
.net, c#, ilist
Solution
Because an interface shoud be easy to implement and not contain "everything but the kitchen". If you add `AddRange` you should then add `InsertRange` and `RemoveRange` (for symmetry). A better question would be why there aren't extension methods for the `IList<T>` interface similar to the `IEnumerable<T>` interface. (extension methods for in-place `Sort`, `BinarySearch`, ... would be useful)
Problem
`List.AddRange()` exists, but `IList.AddRange()` doesn't. This strikes me as odd. What's the reason behind this?