Wpf PasswordBox当我单击CheckBox时必须显示字符

Question

xaml

<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<StackPanel VerticalAlignment="Center" Width="300">
    <PasswordBox x:Name="PasswordBox1" Height="30" PasswordChar="*" Password="12345"/>
    <CheckBox x:Name="CheckBox1" Content="Show Password"/>
</StackPanel>
</Window>

vb.net

Class MainWindow 
Private Sub CheckBox1_Checked(sender As Object, e As RoutedEventArgs) Handles CheckBox1.Checked
    PasswordBox1.PasswordChar = CChar("")
End Sub
Private Sub CheckBox1_Unchecked(sender As Object, e As RoutedEventArgs) Handles CheckBox1.Unchecked
    PasswordBox1.PasswordChar = CChar("*")
End Sub
End Class

Run the above codes and click CheckBox1 in order to understand what is happening.

How can PasswordBox show characters which are 12345 when I click CheckBox?

So, following line need to be repaired.

PasswordBox1.PasswordChar = CChar(" ")

Answer 1

This will work for what you are looking for although it will expose your passwords in memory. We have a textbox and a password box in the same place on our UI and when the user checks the Show Password checkbox we collapse the passwordbox and show the hidden textbox, at the same time updating the text. You will need to check you are using the password from the visible ui control when you send the password.

Xaml code:

<StackPanel Orientation="Horizontal">
  <Grid Width="300" Height="40">
    <PasswordBox Name="passwordBox" PasswordChar="*" />
    <TextBox Name="passwordTxtBox" Visibility="Collapsed" />
  </Grid>
<CheckBox Margin="10" Name="showPassword" Unchecked="ShowPassword_Unchecked"  Checked="ShowPassword_Checked" />
</StackPanel>

Code behind:

    private void ShowPassword_Checked(object sender, RoutedEventArgs e)
    {
        passwordTxtBox.Text = passwordBox.Password;
        passwordBox.Visibility = Visibility.Collapsed;
        passwordTxtBox.Visibility = Visibility.Visible;
    }

    private void ShowPassword_Unchecked(object sender, RoutedEventArgs e)
    {
        passwordBox.Password = passwordTxtBox.Text;
        passwordTxtBox.Visibility = Visibility.Collapsed;
        passwordBox.Visibility = Visibility.Visible;
    }