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    <p>You certainly can't do operator overloading with extension methods. The reason it doesn't work for the <code>Equals</code> method is that if <em>any</em> method is applicable without using extension methods, that method will be chosen before extension methods are even examined.</p> <p>Even though your <code>Equals</code> method is "better" in terms of converting the argument types to the formal parameter types, the compiler always prefers "normal" methods. You'll have to give your method a different name.</p> <p>However, you can always use the <code>Enumerable.SequenceEquals</code> method. I don't believe that short-circuits the length check though (even though it could, for <code>ICollection&lt;T&gt;</code> implementations). You could always implement a more efficient version yourself though. Indeed, if you just change your existing array implementation to be called <code>SequenceEquals</code> or even <code>ArrayEquals</code>, that would be fine:</p> <pre><code>public static bool ArrayEquals(this byte[] array, byte[] bytes) { // I'd personally use braces in all of this, but it's your call if (array.Length != bytes.Length) return false; for (int i = 0; i &lt; array.Length; i++) if (array[i] != bytes[i]) return false; return true; } </code></pre> <p>Note that it would be quite nice to make it generic, but that would certainly cost a bit of performance as the comparison couldn't be inlined:</p> <pre><code>public static bool ArrayEquals&lt;T&gt;(this T[] first, T[] second) { // Reference equality and nullity checks for safety and efficiency if (first == second) { return true; } if (first == null || second == null) { return false; } if (first.Length != second.Length) { return false; } EqualityComparer&lt;T&gt; comparer = EqualityComparer&lt;T&gt;.Default; for (int i = 0; i &lt; first.Length; i++) { if (!comparer.Equals(first[i], second[i])) { return false; } } return true; } </code></pre>
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    1. POI wanna have an Extension method "Equals" between 2 byte arrays
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    1. USJon Skeet
    1. USJon Skeet
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    1. COShouldn't your first, non-generic method also check for reference equality and nullity?
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      1. USTommy Carlier
    2. CO@Tommy: I wanted to leave the first version as close to the original as possible, but provide a fuller solution with more changes.
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      1. USJon Skeet
    3. COWouldn't it be better to null check before doing the equality comparison? Or are you just doing this assuming that two null arrays are considered equal?
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      1. USahawker
 

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