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CA1900: Value type fields should be portable

TypeName

ValueTypeFieldsShouldBePortable

CheckId

CA1900

Category

Microsoft.Portability

Breaking Change

Breaking - If the field can be seen outside the assembly.

Non-breaking - If the field is not visible outside the assembly.

This rule checks that structures that are declared with explicit layout will align correctly when marshaled to unmanaged code on 64-bit operating systems. IA-64 does not allow unaligned memory accesses and the process will crash if this violation is not fixed.

Structures that have explicit layout that contains misaligned fields cause crashes on 64-bit operating systems.

All fields that are smaller than 8 bytes must have offsets that are a multiple of their size, and fields that are 8 bytes or more must have offsets that are a multiple of 8. Another solution is to use LayoutKind.Sequential instead of LayoutKind.Explicit, if reasonable.

This warning should be suppressed only if it occurs in error.

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