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Home/ Questions/Q 8931055
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Editorial Team
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Editorial Team
Asked: June 15, 20262026-06-15T09:01:25+00:00 2026-06-15T09:01:25+00:00

Quick question: what is the maximum size of an unmanaged object that C# can

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Quick question: what is the maximum size of an unmanaged object that C# can handle? I think I may have found my way around my 64-bit array problem, by making calls to a C++ dll, but I’d like to make sure.

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  1. Editorial Team
    Editorial Team
    2026-06-15T09:01:25+00:00Added an answer on June 15, 2026 at 9:01 am

    That’s limited, in the end, by VirtualAlloc, and it depends how you use the memory, and which OS you’re running. Accessing it via C#/.NET doesn’t really change this. The Windows Internals book has a Testlimit[64] application which explores these limits. Read the linked post and try out the application for a complete answer.

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