C# How to make public getters and setters and private methods for a collection?

If you want to ban the modifying operations at compile time, you need a type-safe solution.

EDIT: Original answer is below. As earwicker points out, I hadn't noticed that you aren't asking for it to be readonly - just to prevent the Add operation. That doesn't sound like a good idea to me, as the only difference between Add and the indexer-setter is that Add throws an exception if the element is already present.

That could easily be faked up by the caller anyway.

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