Can I add custom properties to PasswordCredential.Properties?

Question

In WinRT API there is Windows.Security.Credentials namespace which contains the PasswordCredential class. Using it we can encrypt sensitive data like user names and password

Answer 1

No it is a read only property, so you can't set it. It's designed so you can enumerate the properties of the object (not that the c# class properties, but the individual properties of a properties collection). The naming makes this confusing.

Answer 2

Unfortunately, the PasswordCredentials.Properties is an instance of PasswordCredentialPropertyStore which documentation describes every method as "...reserved for internal use and not intended to be used in your code".

That's why it is not useable for programmers.