ITypeInitializationClient.IsBeforeFieldInitSupported Property

Determines whether the client is compatible with the BeforeFieldInit class-level specifier. If true, then PostSharp doesn't add or remove the beforefieldinit specifier - it keeps whatever the C# compiler emitted. If false, then PostSharp removes the beforefieldinit specifier from the class if it had one. You cannot add beforefieldinit to a class that didn't have one.

bool IsBeforeFieldInitSupported { get; }