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    <p>The implementation of <code>SequenceEqual</code> is kind of similar::</p> <pre><code>using (IEnumerator&lt;TSource&gt; enumerator1 = first.GetEnumerator()) using (IEnumerator&lt;TSource&gt; enumerator2 = second.GetEnumerator()) { while (enumerator1.MoveNext()) { if (!enumerator2.MoveNext() || !comparer.Equals(enumerator1.Current, enumerator2.Current)) { return false; } } if (enumerator2.MoveNext()) { return false; } } return true; </code></pre> <p>This default <code>SequenceEqual</code> method use default <code>EqualityComparer&lt;int&gt;.Default</code> for <code>int</code> which is value equality.</p> <p><code>Array</code> implement <code>IStructuralEquatable</code> with <code>Equal</code> method:</p> <pre><code>bool IStructuralEquatable.Equals(object other, IEqualityComparer comparer) { if (other == null) return false; if (!object.ReferenceEquals(this, other)) { Array array = other as Array; if ((array == null) || (array.Length != this.Length)) { return false; } for (int i = 0; i &lt; array.Length; i++) { object x = this.GetValue(i); object y = array.GetValue(i); if (!comparer.Equals(x, y)) { return false; } } } return true; } </code></pre> <p>The <code>IEqualityComparer</code> from input parameter is used, in here you input <code>StructruralEqualityComparer</code> but <code>int</code> does not implement <code>IStructruralEquatable</code>, so it uses default comparer for <code>int</code> which is value equality.</p> <p>But, needless to input <code>StructruralEqualityComparer</code> because <code>int</code> is not structural, you should just use:</p> <pre><code>(arr1 as IStructuralEquatable).Equals(arr2, EqualityComparer&lt;int&gt;.Default); </code></pre> <p>It still works. You should use <code>StructruralEqualityComparer</code> if item in array is <em>structrural</em></p> <p>So to sum up, the implementation for both is kind of the same, both iterate two array based on value equality of <code>int</code> to make comparison.</p> <p>I would prefer the LINQ verson since it is more readable.</p>
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