"Item with same key" exception; dictionary with enum keys

Question

I've got a Dictionary<TKey,TValue> into which I'm inserting a lot of data. The keys are an enum. I keep getting this exception:

An item with the same key has already been added.

But I don't see any dupes, although I suspect some of my enums have the same value. Would that cause a duplicate key error? I thought an enum was a special type, so it's value wouldn't matter.

The exception isn't very helpful...it doesn't tell me which key is tripping the dupe. I'm using an initializer list.

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Edit: Used some regex magic to convert my initializer list into separate .Add calls. Found the key, but I'm still not seeing the dupe...

Answer 1

If multiple members of your enum has the same numeric representation that would be the cause of exception.