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POHow to bind to a PasswordBox in MVVM
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  1. POHow to bind to a PasswordBox in MVVM
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    copied!<p>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 some interesting code here (has anyone used this or something similar?)</p> <p><a href="http://www.wpftutorial.net/PasswordBox.html" rel="noreferrer">http://www.wpftutorial.net/PasswordBox.html</a></p> <p>It technically looks great, but I am unsure of how to retrieve the password. </p> <p>I basically have properties in my <code>LoginViewModel</code> for <code>Username</code> and <code>Password</code>. <code>Username</code> is fine and is working as it's a <code>TextBox</code>.</p> <p>I used the code above as stated and entered this</p> <pre><code>&lt;PasswordBox ff:PasswordHelper.Attach="True" ff:PasswordHelper.Password="{Binding Path=Password}" Width="130"/&gt; </code></pre> <p>When I had the <code>PasswordBox</code> as a <code>TextBox</code> and <code>Binding Path=Password</code> then the property in my <code>LoginViewModel</code> was updated.</p> <p>My code is very simple, basically I have a <code>Command</code> for my <code>Button</code>. When I press it <code>CanLogin</code> is called and if it returns true it calls <code>Login</code>.<br> You can see I check my property for <code>Username</code> here which works great. </p> <p>In <code>Login</code> I send along to my service a <code>Username</code> and <code>Password</code>, <code>Username</code> contains data from my <code>View</code> but <code>Password</code> is <code>Null|Empty</code></p> <pre><code>private DelegateCommand loginCommand; public string Username { get; set; } public string Password { get; set; } public ICommand LoginCommand { get { if (loginCommand == null) { loginCommand = new DelegateCommand( Login, CanLogin ); } return loginCommand; } } private bool CanLogin() { return !string.IsNullOrEmpty(Username); } private void Login() { bool result = securityService.IsValidLogin(Username, Password); if (result) { } else { } } </code></pre> <hr> <p>This is what I am doing</p> <pre><code>&lt;TextBox Text="{Binding Path=Username, UpdateSourceTrigger=PropertyChanged}" MinWidth="180" /&gt; &lt;PasswordBox ff:PasswordHelper.Attach="True" ff:PasswordHelper.Password="{Binding Path=Password}" Width="130"/&gt; </code></pre> <p>I have my <code>TextBox</code>, this is no problem, but in my <code>ViewModel</code> the <code>Password</code> is empty.</p> <p>Am I doing something wrong or missing a step?</p> <p>I put a breakpoint and sure enough the code enter the static helper class but it never updates my <code>Password</code> in my <code>ViewModel</code>.</p>
 

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