これなら使い方を間違えなければエラーは起こらないはず | Codetter（こーどったー）

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public TResult Query<TResult>(Func<IEnumerable<User>, TResult> action)
{
    lock (this.lockObj)
    {
        return action(EnumerableEx.Create(() => this.collection.GetEnumerator()));
    }
}
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