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copied!<p>Unfortunately there isn't a built-in method to do this.</p> <blockquote> <p>PM> Install-Package morelinq</p> </blockquote> <pre><code>var firstBorn = People.MinBy(p => p.DateOfBirth ?? DateTime.MaxValue); </code></pre> <p>Alternatively, you can use the implementation we've got in <a href="https://github.com/morelinq/MoreLINQ" rel="noreferrer">MoreLINQ</a>, in <a href="https://github.com/morelinq/MoreLINQ/blob/ec4bbd3c7ca61e3a98695aaa2afb23da001ee420/MoreLinq/MinBy.cs" rel="noreferrer">MinBy.cs</a>. (There's a corresponding <code>MaxBy</code>, of course.) Here are the guts of it:</p> <pre><code>public static TSource MinBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> selector) { return source.MinBy(selector, null); } public static TSource MinBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> selector, IComparer<TKey> comparer) { if (source == null) throw new ArgumentNullException("source"); if (selector == null) throw new ArgumentNullException("selector"); comparer = comparer ?? Comparer<TKey>.Default; using (var sourceIterator = source.GetEnumerator()) { if (!sourceIterator.MoveNext()) { throw new InvalidOperationException("Sequence contains no elements"); } var min = sourceIterator.Current; var minKey = selector(min); while (sourceIterator.MoveNext()) { var candidate = sourceIterator.Current; var candidateProjected = selector(candidate); if (comparer.Compare(candidateProjected, minKey) < 0) { min = candidate; minKey = candidateProjected; } } return min; } } </code></pre> <p>Note that this will throw an exception if the sequence is empty, and will return the <em>first</em> element with the minimal value if there's more than one.</p>

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