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PO
 

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    <p>Here's one way to get what I think you're asking for:</p> <pre><code>static class Argument { public static void NotNull(Expression&lt;Func&lt;Func&lt;object&gt;&gt;&gt; arg) { if (arg.Compile()()() == null) { var body1 = (Expression&lt;Func&lt;object&gt;&gt;)arg.Body; var body2 = (MemberExpression)body1.Body; throw new ArgumentNullException(body2.Member.Name); } } } </code></pre> <p>Used like this:</p> <pre><code>void F(string foo) { Argument.NotNull(() =&gt; () =&gt; foo); </code></pre> <p>The great thing about this is that renaming <code>foo</code> in the IDE will get all the references. (If you have <code>foo</code> in a string, it will get missed.)</p> <p>If you use this in a tight loop, it may cause performance problems, because it calls <code>.Compile()()</code> each time. You can optimize for performance by adding this overload:</p> <pre><code> public static void NotNull(object value, Expression&lt;Func&lt;Func&lt;object&gt;&gt;&gt; arg) { if (value == null) { var body1 = (Expression&lt;Func&lt;object&gt;&gt;)arg.Body; var body2 = (MemberExpression)body1.Body; throw new ArgumentNullException(body2.Member.Name); } } </code></pre> <p>Which is used like this:</p> <pre><code>Argument.NotNull(foo, () =&gt; () =&gt; foo); </code></pre> <p>It still gets renames correct, and it saves that call on each iteration.</p> <p>What I would recommend is using the first version when you write your code, then run it under a profiler, and switch to the second version in the cases that matter.</p>
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    1. POExtension Method Help
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    1. This table or related slice is empty.
    1. USJay Bazuzi
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    1. COIt does not appear that this will work for extension methods where atttempting to get the type of "this".
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      1. USDavid Williams
 

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