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2013-06-29T11:26:55.483
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2013-06-29T11:26:55.483
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The implementation at (german text) <a href="http://flurfunk.sdx-ag.de/2013/06/linq-iequalitycomparer-durch-lambda.html" rel="nofollow">Implementing IEqualityCompare with lambda expression</a> cares about null values and uses extension methods to generate IEqualityComparer. To create an IEqualityComparer in a Linq union your just have to write <pre><code>persons1.Union(persons2, person => person.LastName) </code></pre> The comparer: <pre><code>public class LambdaEqualityComparer<TSource, TComparable> : IEqualityComparer<TSource> { Func<TSource, TComparable> _keyGetter; public LambdaEqualityComparer(Func<TSource, TComparable> keyGetter) { _keyGetter = keyGetter; } public bool Equals(TSource x, TSource y) { if (x == null || y == null) return (x == null && y == null); return object.Equals(_keyGetter(x), _keyGetter(y)); } public int GetHashCode(TSource obj) { if (obj == null) return int.MinValue; var k = _keyGetter(obj); if (k == null) return int.MaxValue; return k.GetHashCode(); } } </code></pre> You also need to add an extension method to support type inference <pre><code>public static class LambdaEqualityComparer { // source1.Union(source2, lambda) public static IEnumerable<TSource> Union<TSource, TComparable>( this IEnumerable<TSource> source1, IEnumerable<TSource> source2, Func<TSource, TComparable> keySelector) { return source1.Union(source2, new LambdaEqualityComparer<TSource, TComparable>(keySelector)); } } </code></pre>
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1. POWrap a delegate in an IEqualityComparer
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