Databases
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PO
 

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    <p>In the event that you need them to have feature-parity with .Net 4.0 (primarily comparisson):</p> <pre><code>static class Tuple { public static Tuple&lt;T1, T2&gt; Create&lt;T1, T2&gt;(T1 item1, T2 item2) { return new Tuple&lt;T1, T2&gt;(item1, item2); } } [DebuggerDisplay("Item1={Item1};Item2={Item2}")] class Tuple&lt;T1, T2&gt; : IFormattable { public T1 Item1 { get; private set; } public T2 Item2 { get; private set; } public Tuple(T1 item1, T2 item2) { Item1 = item1; Item2 = item2; } #region Optional - If you need to use in dictionaries or check equality private static readonly IEqualityComparer&lt;T1&gt; Item1Comparer = EqualityComparer&lt;T1&gt;.Default; private static readonly IEqualityComparer&lt;T2&gt; Item2Comparer = EqualityComparer&lt;T2&gt;.Default; public override int GetHashCode() { var hc = 0; if (!object.ReferenceEquals(Item1, null)) hc = Item1Comparer.GetHashCode(Item1); if (!object.ReferenceEquals(Item2, null)) hc = (hc &lt;&lt; 3) ^ Item2Comparer.GetHashCode(Item2); return hc; } public override bool Equals(object obj) { var other = obj as Tuple&lt;T1, T2&gt;; if (object.ReferenceEquals(other, null)) return false; else return Item1Comparer.Equals(Item1, other.Item1) &amp;&amp; Item2Comparer.Equals(Item2, other.Item2); } #endregion #region Optional - If you need to do string-based formatting public override string ToString() { return ToString(null, CultureInfo.CurrentCulture); } public string ToString(string format, IFormatProvider formatProvider) { return string.Format(formatProvider, format ?? "{0},{1}", Item1, Item2); } #endregion } </code></pre>
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    1. POEquivalent of Tuple (.NET 4) for .NET Framework 3.5
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    1. USJonathan Dickinson
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    1. CONice answer. This is what i was looking for (i'm on a project where i'm stuck at 3.5). Question : your `GetHashCode()` implementation is `(h1 << 3) ^ h2` while MS one (trought ILSpy) is `(h1 << 5) + h1 ^ h2`. does it really make a difference (performance wise) ?
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    2. CO@tigrou XOR *should* be ever so slightly faster in terms the amount of silicon that get used to do it (it's still one CPU instruction though). That is seriously overdoing micro-optimization though - feel free to use whichever you see fit.
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    3. COI was thinking about possible collisions rather than time taken by to compute a hash code.
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