TheDeveloperBlog.com

Home | Contact Us

C-Sharp | Java | Python | Swift | GO | WPF | Ruby | Scala | F# | JavaScript | SQL | PHP | Angular | HTML

<< Back to WPF

WPF PasswordBox Control: PasswordChanged

PasswordBox. A PasswordBox obscures characters. As the user types, each character is replaced with a symbol—by default, a disc. We use the PasswordChanged event handler to detect changes. And we use the Password property to read the value.
Example. To begin, we drag a PasswordBox control to the window. It is placed within the Grid. And we specify the PasswordChanged event handler. In PasswordBox_PasswordChanged, we detect all modifications made to the input.

And: We then access the Password property on the PasswordBox. This returns a string, one that contains the original characters typed.

Example markup: XAML <Window x:Class="WpfApplication23.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"> <Grid> <PasswordBox HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="100" PasswordChanged="PasswordBox_PasswordChanged"/> </Grid> </Window> Example code: C# using System.Windows; using System.Windows.Controls; namespace WpfApplication23 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void PasswordBox_PasswordChanged(object sender, RoutedEventArgs e) { // ... Display Password in Title. // A bad design decision. var box = sender as PasswordBox; this.Title = "Password typed: " + box.Password; } } }
PasswordChar. Another property available is PasswordChar. When unspecified, this is left as the default value, a filled-in circle (bullet). You can use any character. But some characters will just be confusing.

So: I suggest leaving the PasswordChar as the default. The disc is a standard on web sites and program interfaces.

Discussion. How can you access the Password from a PasswordBox when the user clicks a Button? One way to do this is to assign a member field in the Window class to the value of the Password property in PasswordChanged.

And: This would avoid the need to access the PasswordBox when the Button is clicked.

So: Password validation could thus be done without even touching the PasswordBox when the button is clicked.

Summary. PasswordBox is not needed in many WPF programs. But in places where required, it helps avoid program development steps. It is simple. We access the Password property and use the PasswordChanged event handler.
© TheDeveloperBlog.com
The Dev Codes

Related Links:


Related Links

Adjectives Ado Ai Android Angular Antonyms Apache Articles Asp Autocad Automata Aws Azure Basic Binary Bitcoin Blockchain C Cassandra Change Coa Computer Control Cpp Create Creating C-Sharp Cyber Daa Data Dbms Deletion Devops Difference Discrete Es6 Ethical Examples Features Firebase Flutter Fs Git Go Hbase History Hive Hiveql How Html Idioms Insertion Installing Ios Java Joomla Js Kafka Kali Laravel Logical Machine Matlab Matrix Mongodb Mysql One Opencv Oracle Ordering Os Pandas Php Pig Pl Postgresql Powershell Prepositions Program Python React Ruby Scala Selecting Selenium Sentence Seo Sharepoint Software Spellings Spotting Spring Sql Sqlite Sqoop Svn Swift Synonyms Talend Testng Types Uml Unity Vbnet Verbal Webdriver What Wpf