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    <p>The exact opposite of <code>All()</code> is essentially <code>None</code>, but since LINQ has no <code>None()</code> method, you can accomplish the same result through <code>!set.Any()</code>.</p> <pre><code>!a_list.Any(item =&gt; !(item.matches == true)) </code></pre> <p>This will produce <code>true</code> if none of the items in a_list have a <code>matches</code> value that is not true. </p> <p>That double negative is a bit confusing, so to provide a simpler example:</p> <pre><code>names.All(item =&gt; item.StartsWith("R")) </code></pre> <p>is true if <strong>all</strong> of the items in <code>names</code> start with R (as you know already).</p> <pre><code>!names.Any(item =&gt; item.StartsWith("R")) </code></pre> <p>is true if <strong>none</strong> of the items in <code>names</code> start with R.</p> <p>Based on your comment below, it sounds like you might just be looking for a way to accomplish the same result as your current code snippet, but in a different way. This should provide the same result as your current code, but without the <code>!</code> in the predicate:</p> <pre><code>!a_list.Any(item =&gt; item.matches == true) </code></pre> <p>This can be further simplified to:</p> <pre><code>!a_list.Any(item =&gt; item.matches) </code></pre> <p>I'd imagine yours could be simplified as well, to this:</p> <pre><code>a_list.All(item =&gt; !item.matches) </code></pre> <p>There's rarely a good reason to explicitly compare a boolean value with <code>true</code> or <code>false</code>.</p>
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    1. POIs there an opposite of LINQ's All method?
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    1. COAssuming `.matches` is always `true`, wouldn't you only want the second `!`, without the first?
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    2. CO@TankorSmash I'm not sure. You haven't fully explained what you're trying to do. I gave you the exact opposite of your example. What are you trying to determine, specifically?
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