How to bind to a PasswordBox in MVVM

Question

I have come across a problem with binding to a PasswordBox. It seems it\'s a security risk but I am using the MVVM pattern so I wish to bypass this. I found som

Answer 1

While I agree it's important to avoid storing the password anywhere, I still need the ability to instantiate the view model without a view and execute my tests against it.

The solution that worked for me was to register the PasswordBox.Password function with the view model, and have the view model invoke it when executing the login code.

This does mean a line of code in the view's codebehind.

So, in my Login.xaml I have

and in Login.xaml.cs I have

LoginViewModel.PasswordHandler = () => PasswordBox.Password;

then in LoginViewModel.cs I have the PasswordHandler defined

public Func PasswordHandler { get; set; }

and when login needs to happen the code invokes the handler to get the password from the view...

bool loginResult = Login(Username, PasswordHandler());

This way, when I want to test the viewmodel I can simply set PasswordHandler to an anonymous method that lets me deliver whatever password I want to use in the test.