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POC# Compiler Incorrectly Optimizes Code
 

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    <p>I have a ASP.NET application running on a remote web server and I just started getting this error:</p> <pre><code>Method not found: 'Void System.Collections.Generic.ICollection`1..ctor()'. </code></pre> <p>I disassembled the code in the DLL and it seems like the compiler is incorrectly optimizing the code. (Note that Set is a class that implements a set of unique objects. It inherits from IEnumerable.) This line:</p> <pre><code>Set&lt;int&gt; set = new Set&lt;int&gt;(); </code></pre> <p>Is compiled into this line:</p> <pre><code>Set&lt;int&gt; set = (Set&lt;int&gt;) new ICollection&lt;CalendarModule&gt;(); </code></pre> <p>The CalendarModule class is a totally unrelated class!! Has anyone ever noticed .NET incorrectly compiling code like this before?</p> <p><strong>Update #1:</strong> This problem seems to be introduced by Microsoft's <a href="http://research.microsoft.com/~mbarnett/ILMerge.aspx" rel="nofollow noreferrer">ILMerge</a> tool. We are currently investigating how to overcome it.</p> <p><strong>Update #2:</strong> We found two ways to solve this problem so far. We don't quite understand what the underlying problem is, but both of these fix it:</p> <ol> <li><p>Turn off optimization.</p></li> <li><p>Merge the assemblie with ILMerge on a different machine.</p></li> </ol> <p>So we are left wondering if the build machine is misconfigured somehow (which is strange considering that we have been using the machine to build releases for over a year now) or if it is some other problem.</p>
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    1. COThis is insufficient code to debug your problem. Could you upload enough of your code to reproduce the problem somewhere?
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    2. CODon't you know that Int inherits from CalenderModule? :)
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