Using Linq Except not Working as I Thought

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If you are storing reference types in your list, you have to make sure there is a way to compare the objects for equality. Otherwise they will be checked by comparing if they refer to same address.

You can implement IEqualityComparer<T> and send it as a parameter to Except() function. Here’s a blog post you may find helpful.

edit: the original blog post link was broken and has been replaced above

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