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    <p>I would do something like that using <a href="http://www.postsharp.org/aop-net/overview" rel="nofollow noreferrer">PostSharp</a>.</p> <p>It runs as an extra build step and inserts the corresponding MSIL, but it will do what you want. The PostSharp attribute definitions would look something like this (depending on your exact implementation). These could then be used as you describe above.</p> <pre><code>public sealed class ReadOperationAttribute : OnMethodBoundaryAspect { // not quite sure how you manage your lock, so put this dummy method in. ReaderWriterLock _rwLock = ReaderWriterLock.GetCorrectReaderWriterLock(); [ThreadStatic] static bool _isLocked; public override void OnEntry( MethodExecutionEventArgs e ) { try { _rwLock.AcquireReaderLock(10000); _isLocked = true; } catch { _isLocked = false; throw; } } public override void OnExit( MethodExecutionEventArgs e ) { if (_isLocked) { _rwLock.ReleaseReaderLock(); _isLocked = false; } } } public sealed class WriteOperationAttribute : OnMethodBoundaryAspect { // not quite sure how you manage your lock, so put this dummy method in. ReaderWriterLock _rwLock = ReaderWriterLock.GetCorrectReaderWriterLock(); [ThreadStatic] static bool _isLocked; public override void OnEntry( MethodExecutionEventArgs e ) { try { _rwLock.AcquireWriterLock(10000); _isLocked = true; } catch { _isLocked = false; throw; } } public override void OnExit( MethodExecutionEventArgs e ) { if (_isLocked) { _rwLock.ReleaseReaderLock(); _isLocked = false; } } } </code></pre> <p>EDIT: Updated to address concerns. (Untested ;) ) Also, note as I said in the comment to the question, Microsoft <a href="http://msdn.microsoft.com/en-us/library/system.threading.readerwriterlock.aspx" rel="nofollow noreferrer">recommends</a> using <code>ReaderWriterLockSlim</code> in preference to <code>ReaderWriterLock</code>.</p>
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    1. COWhile this is my favorite answer, it is not good enough, due to a small but critical detail. The override of OnEntry causes the acquiring of the lock going INSIDE the "try" section. Should the acquiring of the lock fail (and throw an exception), the "finally" section will still run.
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    2. COWell, that would be easy enough to keep track of, assuming the lock has an 'IsReadLockedOnThisThread' type member... If not, use a boolean flag.
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    3. COMake that a ThreadLocal boolean flag ;)
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