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copied!<p>What you need is a Set, as far as I remember there was no Set implementation in 2.0. You can check <a href="http://www.codeproject.com/KB/recipes/sets.aspx?msg=1297493" rel="nofollow noreferrer">this</a> out.</p> <p><strong>Edit:</strong> If you really want to implement your own, something like this would do the job in expense of performance on inserts: (I did not test the functionality)</p> <pre><code>class UniqueList<T> : IList<T> { private IList<T> m_InternalList; public UniqueList(IList<T> list) { m_InternalList = list; } public System.Collections.ObjectModel.ReadOnlyCollection<T> AsReadOnly() { return new System.Collections.ObjectModel.ReadOnlyCollection<T>(this); } #region IList<T> Members public int IndexOf(T item) { return m_InternalList.IndexOf(item); } public void Insert(int index, T item) { if (!m_InternalList.Contains(item)) m_InternalList.Insert(index, item); } public void RemoveAt(int index) { m_InternalList.RemoveAt(index); } public T this[int index] { get { return m_InternalList[index]; } set { if (!m_InternalList.Contains(value)) m_InternalList[index] = value; } } #endregion #region ICollection<T> Members public void Add(T item) { if (!m_InternalList.Contains(item)) m_InternalList.Add(item); } public void Clear() { m_InternalList.Clear(); } public bool Contains(T item) { return m_InternalList.Contains(item); } public void CopyTo(T[] array, int arrayIndex) { m_InternalList.CopyTo(array, arrayIndex); } public int Count { get { return m_InternalList.Count; } } public bool IsReadOnly { get { return m_InternalList.IsReadOnly; } } public bool Remove(T item) { return m_InternalList.Remove(item); } #endregion #region IEnumerable<T> Members public IEnumerator<T> GetEnumerator() { return m_InternalList.GetEnumerator(); } #endregion #region IEnumerable Members System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return m_InternalList.GetEnumerator(); } #endregion } </code></pre>

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