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POExclude results from Linq query excluding everything when exclude list is empty
 

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    <p>I have the following code:</p> <pre><code> public IList&lt;Tweet&gt; Match(IEnumerable&lt;Tweet&gt; tweetStream, IList&lt;string&gt; match, IList&lt;string&gt; exclude) { var tweets = from f in tweetStream from m in match where f.Text.ToLowerInvariant().Contains(m) select f; var final = from f in tweets from e in exclude where !f.Text.ToLowerInvariant().Contains(e.ToLowerInvariant()) select f; return final.Distinct().ToList&lt;Tweet&gt;(); } </code></pre> <p>I've been building the tests up which haven't included the <code>final</code> resultset and been matching happily now I've added the exclude if the <code>IList&lt;string&gt;exclude</code> is empty all items are removed.</p> <p>So this test passes as it should:</p> <pre><code> [TestMethod] public void Should_exclude_items_from_exclude_list() { IEnumerable&lt;Tweet&gt; twitterStream = new List&lt;Tweet&gt; { new Tweet("I have a Mazda car"), new Tweet("I have a ford"), new Tweet("Mazda Rules"), new Tweet("My Ford car is great"), new Tweet("My renault is brill"), new Tweet("Mazda cars are great") }; IList&lt;string&gt; matches = new List&lt;string&gt;{"mazda","car"}; IList&lt;string&gt; exclude = new List&lt;string&gt;{"ford"}; Matcher target = new Matcher(); IList&lt;Tweet&gt; actual = target.Match(twitterStream, matches, exclude); Assert.AreEqual(3, actual.Count); } </code></pre> <p>but this test now fails:</p> <pre><code> [TestMethod] public void Should_match_items_either_mazda_or_car_but_no_duplicates() { IEnumerable&lt;Tweet&gt; twitterStream = new List&lt;Tweet&gt; { new Tweet("I have a Mazda car"), new Tweet("I have a ford"), new Tweet("Mazda Rules"), new Tweet("My Ford car is great"), new Tweet("My renault is brill"), new Tweet("Mazda cars are great") }; IList&lt;string&gt; matches = new List&lt;string&gt;{"mazda","car"}; IList&lt;string&gt; exclude = new List&lt;string&gt;(); Matcher target = new Matcher(); IList&lt;Tweet&gt; actual = target.Match(twitterStream, matches, exclude); Assert.AreEqual(4, actual.Count); } </code></pre> <p>I know I'm missing something really simple but after staring at the code for an hour its not coming to me.</p>
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