Data binding for PasswordBox in WPF

The password property of PasswordBox in WPF does not support data binding (for security reasons) and is required in the MVVM design pattern.

So we're going to add a helper class to complete the binding.

Code Transfer from: http://blog.csdn.net/oyi319/article/details/6551532

    /// <summary>      ///to increase the binding function for the password of the PasswordBox control/// </summary>       Public Static classPasswordboxhelper { Public Static ReadOnlyDependencyProperty Passwordproperty =dependencyproperty.registerattached ("Password",              typeof(string),typeof(passwordboxhelper),NewFrameworkpropertymetadata (string.          Empty, onpasswordpropertychanged));  Public Static ReadOnlyDependencyProperty Attachproperty =dependencyproperty.registerattached ("Attach",              typeof(BOOL),typeof(Passwordboxhelper),NewPropertyMetadata (false, Attach)); Private Static ReadOnlyDependencyProperty Isupdatingproperty =dependencyproperty.registerattached ("isupdating",typeof(BOOL),             typeof(Passwordboxhelper));  Public Static voidSetattach (DependencyObject DP,BOOLvalue) {DP.          SetValue (attachproperty, value); }           Public Static BOOLGetattach (DependencyObject dp) {return(BOOL) DP.          GetValue (Attachproperty); }           Public Static stringGetPassword (DependencyObject dp) {return(string) DP.          GetValue (Passwordproperty); }           Public Static voidSetPassword (DependencyObject DP,stringvalue) {DP.          SetValue (passwordproperty, value); }          Private Static BOOLgetisupdating (DependencyObject dp) {return(BOOL) DP.          GetValue (Isupdatingproperty); }          Private Static voidSetisupdating (DependencyObject DP,BOOLvalue) {DP.          SetValue (isupdatingproperty, value); }          Private Static voidonpasswordpropertychanged (DependencyObject sender, DependencyPropertyChangedEventArgs e) { PasswordBox PasswordBox= Sender asPasswordBox; Passwordbox.passwordchanged-=passwordchanged; if(! (BOOL) getisupdating (PasswordBox)) {Passwordbox.password= (string) E.newvalue; } passwordbox.passwordchanged+=passwordchanged; }          Private Static voidAttach (DependencyObject sender, DependencyPropertyChangedEventArgs e) {passwordbo X PasswordBox= Sender asPasswordBox; if(PasswordBox = =NULL)                  return; if((BOOL) {e.oldvalue) {passwordbox.passwordchanged-=passwordchanged; }              if((BOOL) {e.newvalue) {passwordbox.passwordchanged+=passwordchanged; }          }          Private Static voidPasswordChanged (Objectsender, RoutedEventArgs e) {PasswordBox PasswordBox= Sender asPasswordBox; Setisupdating (PasswordBox,true);              SetPassword (PasswordBox, Passwordbox.password); Setisupdating (PasswordBox,false); }      }  

Then PasswordBox can do the following bindings in Xmal

    <heplers:PasswordBoxHelper.Attach= "True"  heplers: Passwordboxhelper.password= "{Binding path=password,mode=twoway,updatesourcetrigger= PropertyChanged}"/>

Data binding for PasswordBox in WPF