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Home/ Questions/Q 6221761
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T08:11:25+00:00 2026-05-24T08:11:25+00:00

I’m looking a way to determine size in bytes of a value type (TypeReference)

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I’m looking a way to determine size in bytes of a value type (TypeReference) in Mono.Cecil.

I need it to optimize Nullable equality compare code generation.

  • If value type size > 4, compare HasValue first, then compare values.
  • If value type size <= 4, compare GetValueOrDefault first, then compare HasValue.

But to do so, I need to get somehow sizeof(T).

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  1. Editorial Team
    Editorial Team
    2026-05-24T08:11:26+00:00Added an answer on May 24, 2026 at 8:11 am

    It’s not 100% perfect (since since will vary based on 32/64 bits arch) but Gendarme has the code to do this task. Look at the SizeOf method inside:

    https://raw.github.com/mono/mono-tools/master/gendarme/rules/Gendarme.Rules.Performance/AvoidLargeStructureRule.cs

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