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+<h2>List Mapper (NUnit 2.4.2)</h2>
+
+<p>Unlike Constraint classes, <b>ListMapper</b> is used to modify the actual
+value argument to Assert.That(). It transforms the actual value, which
+must be a collection, creating a new collection to be tested against the
+supplied constraint. Currently, ListMapper supports one transformation: creating
+a collection of property values.
+
+<p>Normally, ListMapper will be used through the <b>List.Map()</b> syntax helper
+or the inherited syntax equivalent, <b>Map()</b>. The following example
+shows three forms of the same assert:
+
+<div class="code"><pre>
+string[] strings = new string[] { "a", "ab", "abc" };
+int[] lengths = new int[] { 1, 2, 3 };
+
+Assert.That(List.Map(strings).Property("Length"),
+ Is.EqualTo(lengths));
+
+Assert.That(new ListMapper(strings).Property("Length"),
+ Is.EqualTo(lengths));
+
+// Assuming inheritance from AssertionHelper
+Expect(Map(strings).Property("Length"), EqualTo(lengths));
+</pre></div>
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