WPF PasswordBox Password Data binding

The Password property of the WPF PasswordBox control is not a dependency property, it cannot be directly data-bound, and to make it work properly in MVVM mode, you can add an helper class to PasswordBox as follows:

Original link: http://blog.csdn.net/ryb666666/article/details/7629767

1. Create a new Passwordboxhelper helper class

1   Public Static classPasswordboxhelper2     {3          Public Static ReadOnlyDependencyProperty Passwordproperty =4Dependencyproperty.registerattached ("Password",5             typeof(string),typeof(passwordboxhelper),6             NewFrameworkpropertymetadata (string. Empty, onpasswordpropertychanged));7          Public Static ReadOnlyDependencyProperty Attachproperty =8Dependencyproperty.registerattached ("Attach",9             typeof(BOOL),typeof(Passwordboxhelper),NewPropertyMetadata (false, Attach));Ten         Private Static ReadOnlyDependencyProperty Isupdatingproperty = OneDependencyproperty.registerattached ("isupdating",typeof(BOOL), A            typeof(Passwordboxhelper)); -  -          Public Static voidSetattach (DependencyObject DP,BOOLvalue) the         { - DP. SetValue (attachproperty, value); -         } -          Public Static BOOLGetattach (DependencyObject dp) +         { -             return(BOOL) DP. GetValue (attachproperty); +         } A          Public Static stringGetPassword (DependencyObject dp) at         { -             return(string) DP. GetValue (passwordproperty); -         } -          Public Static voidSetPassword (DependencyObject DP,stringvalue) -         { - DP. SetValue (passwordproperty, value); in         } -         Private Static BOOLgetisupdating (DependencyObject dp) to         { +             return(BOOL) DP. GetValue (isupdatingproperty); -         } the         Private Static voidSetisupdating (DependencyObject DP,BOOLvalue) *         { $ DP. SetValue (isupdatingproperty, value);Panax Notoginseng         } -         Private Static voidonpasswordpropertychanged (DependencyObject sender, the DependencyPropertyChangedEventArgs e) +         { APasswordBox PasswordBox = Sender asPasswordBox; thePasswordbox.passwordchanged-=passwordchanged; +             if(! (BOOL) getisupdating (PasswordBox)) -             { $Passwordbox.password = (string) E.newvalue; $             } -Passwordbox.passwordchanged + =passwordchanged; -         } the         Private Static voidAttach (DependencyObject sender, - DependencyPropertyChangedEventArgs e)Wuyi         { thePasswordBox PasswordBox = Sender asPasswordBox; -             if(PasswordBox = =NULL) Wu                 return; -             if((BOOL) e.oldvalue) About             { $Passwordbox.passwordchanged-=passwordchanged; -             } -             if((BOOL) e.newvalue) -             { APasswordbox.passwordchanged + =passwordchanged; +             } the         } -         Private Static voidPasswordChanged (Objectsender, RoutedEventArgs e) $         { thePasswordBox PasswordBox = Sender asPasswordBox; theSetisupdating (PasswordBox,true); the SetPassword (PasswordBox, Passwordbox.password); theSetisupdating (PasswordBox,false); -         } in}

View Code

2. xaml binding in the view layer

1  <passwordbox x:name="PasswordBox"  passwordchar="*" helper:passwordboxhelper.attach="True"2              Helper: passwordboxhelper.password="{Binding path=pwd,mode=twoway,updatesourcetrigger=propertychanged}  "/>

1<window x:class="HR_Test01.View.LoginView"2xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"3xmlns:x="Http://schemas.microsoft.com/winfx/2006/xaml"4         xmlns:helper="clr-namespace:hr_test01.model"        5Xmlns:d="http://schemas.microsoft.com/expression/blend/2008"6Xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"7Xmlns:local="Clr-namespace:hr_test01.view"8mc:ignorable="D"allowstransparency="True"windowstyle="None"mouseleftbuttondown="Window_mouseleftbuttondown" 9title="Login Interface"height=" -"Width=" -"windowstartuplocation="Centerscreen">

WPF PasswordBox Password Data binding