The IsWritePublic value considers whether the DeclaringType is public as part of the determination. If DeclaringType is nonpublic, the set accessor is not callable in a practical way, and IsWritePublic returns false.
The LookupIsWritePublic method is virtual and therefore, can be overridden. The override has the potential to change (maliciously or otherwise) the reported access information of a XAML member so that it no longer aligns in an expected way with the type system access information of its underlying CLR declaration. For any security-critical checks of access levels, use the underlying CLR type instead.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)