CA1421: Method uses runtime marshalling when DisableRuntimeMarshallingAttribute is applied

Raksts
16.12.2023

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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