The Dictionary<T, List<T>> is a private member and external methods should not modify its content. Therefore I want to create a public property making it readonly. But I don't know how to do it. It seems only possible when the value type of dictionary is not a mutable type.
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AakashM
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martinrhan
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Can you also please share some code where you've tried to accomplish your problem? Where is your problem when casting? – Chrᴉz remembers Monica Oct 01 '21 at 10:42
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If you want to make sure that your original Dictionary is not modified, you usually either create a read-only copy on the fly when it is accessed, or you maintain a read-only copy and expose that. Otherwise, whoever accesses the reference can always cast it back to a mutable type. If you want your Dictionary to handle these operations itself, i'm afraid you have to code your own wrapper. – cboittin Oct 01 '21 at 14:05