System.Reflection.RuntimeMethodInfo.GetMethodImplementationFlags C# (CSharp) Method

        public override MethodImplAttributes GetMethodImplementationFlags()
        {
            return m_handle.GetImplAttributes();
        }

 internal static Attribute GetCustomAttribute(RuntimeMethodInfo method)
 {
     if ((method.GetMethodImplementationFlags() & MethodImplAttributes.PreserveSig) == MethodImplAttributes.IL)
     {
         return null;
     }
     return new PreserveSigAttribute();
 }