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POCan the (plain) throw statement in C# cause exceptions?
 

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  1. POCan the (plain) throw statement in C# cause exceptions?
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    <p><strong><em>Question:</strong> Can the plain <code>throw</code> statement in C# ever cause a new exception in itself?</em></p> <hr> <p>Note that I ask this question out of <em>curiosity</em>, not because I have any practical or real-world situation where it would matter much. Also note that my gut feeling and experience tell me that the answer is "No", but I'm looking to validate that answer somehow (see further down on sources I've tried so far).</p> <p>Here's some sample code to illustrate my question:</p> <pre><code>try { int x = 0, y = 1 / x; } catch (Exception outerException) { try { throw; } catch (Exception innerException) { // Q: Does this Assert ever fail?? System.Diagnostics.Debug.Assert(outerException.Equals(innerException)); } } </code></pre> <p>I'm wondering if there's any way at all to alter the circumstances such that the <code>Assert</code> will fail, without touching the inner <code>try/catch</code> block. </p> <p>What I've tried or was looking to try to answer this:</p> <ul> <li>Read the <a href="http://msdn.microsoft.com/en-us/library/1ah5wsex.aspx" rel="noreferrer">throw (C# Reference)</a> page on MSDN - no definitive answer;</li> <li>Checked part 5.3.3.11 of the <a href="http://msdn.microsoft.com/en-us/library/ms228593.aspx" rel="noreferrer">C# Language Specification</a> - which is probably the wrong place to look for this kind of info;</li> <li>Glossed through the exceptions that I could try to trigger on the throw statement. The OutOfMemoryException comes to mind, but is kind of hard to trigger at the time of the <code>throw</code>.</li> <li>Opened up ILDASM to check the generated code. I can see that <code>throw</code> translates to a <code>rethrow</code> instruction, but I'm lost where to look further to check if that statement can or cannot throw an exception.</li> </ul> <p>This is what ILDASM shows for the inner <code>try</code> bit:</p> <pre><code>.try { IL_000d: nop IL_000e: rethrow } // end .try </code></pre> <p>So, to summarize: can a throw statement (used to rethrow an exception) ever <em>cause</em> an exception itself?</p>
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    1. COExcept for satisfying ones curiosity, what problem are you trying to solve?
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    2. COJust curiosity I'm afraid, I don't have any exciting (as far as exception can even be exciting) real-world scenario relating to this.
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    3. COI do think it could happen if your stack is corrupt. In that case rethrow will try to unwind the stack to the next method with a catch/finally/fault clause. If it can´t it will cause an exception but more likely a ExecutionEngineException which will cause normally the immediate termination of your process.
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