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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1421 below:

CA1421: Method uses runtime marshalling when 'DisableRuntimeMarshallingAttribute' is applied - .NET

CA1421: Method uses runtime marshalling when DisableRuntimeMarshallingAttribute is applied

Property Value Rule ID CA1421 Title Method uses runtime marshalling when DisableRuntimeMarshallingAttribute is applied Category Interoperability Fix is breaking or non-breaking Non-breaking Enabled by default in .NET 9 As suggestion Cause

A method uses runtime marshalling, and runtime marshalling is explicitly disabled.

Rule description

If a method uses runtime marshalling when runtime marshalling is disabled, it can cause unexpected behavior differences at run time due to different expectations of a type's native layout.

How to fix violations

Enable runtime marshalling or use features like sizeof and pointers to ensure accurate results.

When to suppress warnings

Don't suppress a warning from this rule.

Example

The following code snippet shows a violation of CA1421:

using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

[assembly: DisableRuntimeMarshalling]

class C
{
    public void Test()
    {
        nint offset = Marshal.OffsetOf(typeof(ValueType), "field");
    }
}

struct ValueType
{
    int field;
}


Imports System.Runtime.CompilerServices
Imports System.Runtime.InteropServices

<Assembly: DisableRuntimeMarshalling>

Class C
    Shared Sub S1()
        Dim offset As IntPtr = Marshal.OffsetOf(GetType(ValueType), "field")
    End Sub
End Class

Structure ValueType
    Dim field As Integer
End Structure

To fix the violation, remove the DisableRuntimeMarshallingAttribute attribute on the assembly.

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