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I have a class in C# that contains a Dictionary, which I want to create and ensure nothing as added, edited or removed from this dictionary as long as the class which contains it exists. readonly doesn't really help, once I tested and saw that I can add items after. Just for instance, I created an example: public class DictContainer { private readonly Dictionary<int, int> myDictionary; public DictContainer() { myDictionary = GetDictionary(); } private Dictionary<int, int> GetDictionary() { Dictionary<int, int> myDictionary = new Dictionary<int, int>(); myDictionary.Add(1, 2); myDictionary.Add(2, 4); myDictionary.Add(3, 6); return myDictionary; } public void Add(int key, int value) { myDictionary.Add(key, value); } } I want the Add method not to work. If possible, I want it not to even compile. Any suggestions? Actually, I'm worried for it is code that will be open for a lot of people to change. So, even if I hide the Add method, it will be possible for someone to "innocently" create a method which add a key, or remove another. I want people to look and know they shouldn't change the dictionary in any ways. Just like I have with a const variable.

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