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2166674
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2010-01-30T03:10:57.510
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2010-01-30T03:10:57.510
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This is actually possible, but maybe in a slightly different form than you're used to. In .NET, lambda expressions can either be interpreted as delegates OR as <a href="http://msdn.microsoft.com/en-us/library/bb397951.aspx" rel="noreferrer">expression trees</a>. It is relatively straightforward to perform a <code>NOT</code> operation on an expression tree. Here is a sample using your code as a starting point: <pre><code>namespace Sample { using System; using System.Collections.Generic; using System.Linq.Expressions; internal class ExpressionSample { private static Expression<TDelegate> Negate<TDelegate>(Expression<TDelegate> expression) { return Expression.Lambda<TDelegate>(Expression.Not(expression.Body), expression.Parameters); } private static void Main() { // Match any string of length 2 or more characters Expression<Predicate<string>> expression = (s) => s.Length > 1; // Logical negation, i.e. match string of length 1 or fewer characters Expression<Predicate<string>> negatedExpression = ExpressionSample.Negate(expression); // Compile expressions to predicates Predicate<string> predicate = expression.Compile(); Predicate<string> negativePredicate = negatedExpression.Compile(); List<string> list1 = new List<string> { string.Empty, "an item", "x", "another item" }; List<string> list2 = new List<string> { "yet another item", "still another item", "y", string.Empty }; list2.RemoveAll(negativePredicate); list2.AddRange(list1.FindAll(predicate)); list2.ForEach((s) => Console.WriteLine(s)); } } } </code></pre>
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