C # compiler improperly optimizes code

Question

I have an ASP.NET application running on a remote web server, and I just started getting this error:

Method not found: 'Void System.Collections.Generic.ICollection`1..ctor()'.

I parsed the code in a DLL, and it seems that the compiler is not optimizing the code correctly. (Note that Set is a class that implements a set of unique objects. It inherits from IEnumerable.) This line:

Set<int> set = new Set<int>();

Compiled to this line:

Set<int> set = (Set<int>) new ICollection<CalendarModule>();

The CalendarModule class is a completely unrelated class! Has anyone ever noticed .NET incorrectly compiling such code before?

Update # 1: This issue seems to be introduced by Microsoft ILMerge . We are currently studying how to overcome it.

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Answer 6

Uch. If this is really an ILMerge error, please keep this topic up to date with your results - I use ILMerge as a key step in building a COM interop assembly.