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

A simple solution without violating the MVVM pattern is to introduce an event (or delegate) in the ViewModel that harvests the password.

In the ViewModel:

public event EventHandler HarvestPassword;

with these EventArgs:

class HarvestPasswordEventArgs : EventArgs
{
    public string Password;
}

in the View, subscribe to the event on creating the ViewModel and fill in the password value.

_viewModel.HarvestPassword += (sender, args) => 
    args.Password = passwordBox1.Password;

In the ViewModel, when you need the password, you can fire the event and harvest the password from there:

if (HarvestPassword == null)
  //bah 
  return;

var pwargs = new HarvestPasswordEventArgs();
HarvestPassword(this, pwargs);

LoginHelpers.Login(Username, pwargs.Password);