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    <p>I bet your real project had <code>OPTION STRICT ON</code>, as all projects should, and that your test project had it OFF. That's why you didn't get a compiler error in your test project.</p> <p><strong>EDIT:</strong> the poster says he has OPTION STRICT ON for both projects. That makes this more interesting.</p> <p>I still think the most likely reason for this difference is that in one case, the compiler compiled the code and saw the error; but in the other case, the compiler didn't comile the code. Is this the same version of Visual Studio on the same machine at the same time? Same .NET Framework version in both cases?</p> <p>Are these both the same type of project, for instance, are they both console applications? I ask because ASP.NET Web Site "projects" usually don't attempt to compile code until the code is called. If your test project were such a "project", and if you didn't actualy test the code (that is, if you didn't actually step into this code and see it work), then you might have assumed that the fact you could press F5 meant that all the code was compiled, when it wasn't.</p> <p>My next thoughts would be to see if MyDictionary was really of the same type in both cases.</p> <p>Beyond that, if you really need to know why this happened, I'd make a copy of the "real" project, and start changing it to be more and more like the test project. This would probably be a matter of mass deletions at first. I'd keep changing it either until the problem was found, or until the two were identical.</p> <p><strong>EDIT 2:</strong> The default console project imports the System.Linq namespace (see the "References" tab in project properties). This import brings the ElementAtOrDefault extension method into scope. This extension method extends IEnumerable(Of T); in your case IEnumerable(Of Double), which is what the Keys property implements.</p> <p>What surprises me about this is that VB.NET is automatically applying this extension method. In C#, the method would need to be explicitly named.</p> <p>If you remove the Import of System.Linq, you'll find that your test application gets the same error as the production application.</p>
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    1. USJohn Saunders
    1. USJohn Saunders
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    1. COI have option strict on in both projects.
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    2. COYes, I was missing the System.Linq import. Thank you.
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