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Home/ Questions/Q 7070437
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T05:33:59+00:00 2026-05-28T05:33:59+00:00

I am using an existing DB (I cannot change it). My class maps to

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I am using an existing DB (I cannot change it). My class maps to a column of type numeric(18,0). If I try to map this to anything else, it breaks and tells me to map to Decimal. I’ve also googled and confirmed this is the right type (and tried using Int64, etc, and been told to use Decimal). When I use Decimal, I get this error:

Common Language Runtime detected an invalid program.

So, it appears that I can’t map to this column. I am mapping to a view, could I perhaps return this value as a string from my view? Do I need to? Is the value just too big and there’s no way to map it?

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  1. Editorial Team
    Editorial Team
    2026-05-28T05:34:00+00:00Added an answer on May 28, 2026 at 5:34 am

    Looks like this is a reported bug fixed in .NET vNext: https://connect.microsoft.com/VisualStudio/feedback/details/620031/invalidprogramexception-using-entityframework-poco-template-table-w-decimal-primary-key

    Also, see here: InvalidProgramException: Common Language Runtime detected an invalid program

    and

    CLR detected an Invalid Program

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