How does a List know that you changed it while enumerating it?

Everyone falls for that and tries to change a list while enumerating it greated by the System.InvalidOperationException: Collection was modified; enumeration operation may not execute. message. But how does the List know that you changed it? Let's find out.

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15/12/2022
14 min

Array, List, Collection, Set, ReadOnlyList - what? A comprehensive and exhaustive list of collection-like types

.NET knows a big list of collection-like types like: IEnumerable, IQueryable, IList, ICollection, Array, ISet, ImmutableArray, ReadOnlyCollection, ReadOnlyList, and many more.

This blog post will give you an exhaustive list of types in .NET and when to use what.

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