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    <p>Starting from <a href="https://stackoverflow.com/questions/5756692/arraysegment-returning-the-actual-segment-c/5756714#5756714">Thomas Levesque's suggestion</a> I've built a simple <code>ArraySegmentWrapper&lt;T&gt;</code> class to use in this way:</p> <pre><code>static void Main(string[] args) { int[] arr = new int[10]; for (int i = 0; i &lt; arr.Length; i++) arr[i] = i; // arr = 0,1,2,3,4,5,6,7,8,9 var segment = new ArraySegmentWrapper&lt;int&gt;(arr, 2, 7); segment[0] = -1; segment[6] = -1; // now arr = 0,1,-1,3,4,5,6,7,-1,9 // this prints: -1,3,4,5,6,7,-1 foreach (var el in segment) Console.WriteLine(el); } </code></pre> <p><strong>Implementation:</strong></p> <pre><code>public class ArraySegmentWrapper&lt;T&gt; : IList&lt;T&gt; { private readonly ArraySegment&lt;T&gt; segment; public ArraySegmentWrapper(ArraySegment&lt;T&gt; segment) { this.segment = segment; } public ArraySegmentWrapper(T[] array, int offset, int count) : this(new ArraySegment&lt;T&gt;(array, offset, count)) { } public int IndexOf(T item) { for (int i = segment.Offset; i &lt; segment.Offset + segment.Count; i++) if (Equals(segment.Array[i], item)) return i; return -1; } public void Insert(int index, T item) { throw new NotSupportedException(); } public void RemoveAt(int index) { throw new NotSupportedException(); } public T this[int index] { get { if (index &gt;= this.Count) throw new IndexOutOfRangeException(); return this.segment.Array[index + this.segment.Offset]; } set { if (index &gt;= this.Count) throw new IndexOutOfRangeException(); this.segment.Array[index + this.segment.Offset] = value; } } public void Add(T item) { throw new NotSupportedException(); } public void Clear() { throw new NotSupportedException(); } public bool Contains(T item) { return this.IndexOf(item) != -1; } public void CopyTo(T[] array, int arrayIndex) { for (int i = segment.Offset; i &lt; segment.Offset + segment.Count; i++) { array[arrayIndex] = segment.Array[i]; arrayIndex++; } } public int Count { get { return this.segment.Count; } } public bool IsReadOnly { get { return false; } } public bool Remove(T item) { throw new NotSupportedException(); } public IEnumerator&lt;T&gt; GetEnumerator() { for (int i = segment.Offset; i &lt; segment.Offset + segment.Count; i++) yield return segment.Array[i]; } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return GetEnumerator(); } } </code></pre> <hr> <h2>EDIT :</h2> <p>As pointed out by @JeppeStigNielsen in the comments, since .NET 4.5 <code>ArraySegment&lt;T&gt;</code> implements <code>IList&lt;T&gt;</code></p>
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    1. COEDIT: Fixed a coupe of errors ;)
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    2. COWell, its a gem for me, I will do some profiling now and see what I can come up with.
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    3. COCheck out the profiling, you made my day!
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