Why do arrays in .net only implement IEnumerable and not IEnumerable?

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Arrays do implement IEnumerable<T>, but it is done as part of the special knowledge the CLI has for arrays. This works as if it were an explicit implementation (but isn’t: it is done at runtime). Many tools will not show this implementation, this is described in the Remarks section of the Array class overview.

You could add a cast:

return ((IEnumerable<T>)_array).GetEnumerator();

Note, older MSDN (pre learn.microsoft.com) coverage of this changed a few times with different .NET versions, check for the remarks section.

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