标签:obj DependencyProperty PasswordBox static WPF Password public 属性
由于PasswordBox的Password不是依赖属性,所以无法对其进行绑定。
这是需要通过添加附加属性,在附加属性中通过PasswordBox中可以用的依赖属性关联,实现Password绑定。
依赖属性:
-----MonitorPassword:关联PasswordBox中的PasswordChange事件。当PasswordChange事件发生时,修改AttachPassword属性。
-----AttachPassword:被绑定的附加属性
-----HasText:是否显示水印附加属性
附加属性类:
public class PasswordProperties { #region 绑定PasswordBox.PasswordChange事件,一旦发生passwordChange事件,设置其余两个附件属性; public static bool GetMonitorPassword(DependencyObject obj) { return (bool)obj.GetValue(MonitorPasswordProperty); } public static void SetMonitorPassword(DependencyObject obj, bool value) { obj.SetValue(MonitorPasswordProperty, value); } // Using a DependencyProperty as the backing store for MonitorPassword. This enables animation, styling, binding, etc... public static readonly DependencyProperty MonitorPasswordProperty = DependencyProperty.RegisterAttached("MonitorPassword", typeof(bool), typeof(PasswordProperties), new PropertyMetadata(false, OnMonitorPasswordChanged)); private static void OnMonitorPasswordChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { PasswordBox? p = d as PasswordBox; if (p == null) return; p.PasswordChanged -= P_PasswordChanged; if ((bool)e.NewValue) { SetHasText(p); p.PasswordChanged += P_PasswordChanged; } } private static void P_PasswordChanged(object sender, RoutedEventArgs e) { PasswordBox? p = sender as PasswordBox; if(p == null) return; SetHasText(p); SetAttachPassword(p); } #endregion #region password的附件属性 public static string GetAttachPassword(PasswordBox obj) { return (string)obj.GetValue(AttachPasswordProperty); } public static void SetAttachPassword(PasswordBox obj) { obj.SetValue(AttachPasswordProperty, obj.Password); } // Using a DependencyProperty as the backing store for AttachPassword. This enables animation, styling, binding, etc... public static readonly DependencyProperty AttachPasswordProperty = DependencyProperty.RegisterAttached("AttachPassword", typeof(string), typeof(PasswordProperties), new PropertyMetadata(0)); #endregion #region password是否为空的附件属性,用于判断是否显示水印 public static bool GetHasText(PasswordBox obj) { return (bool)obj.GetValue(HasTextProperty); } public static void SetHasText(PasswordBox obj) { obj.SetValue(HasTextProperty, obj.Password.Length > 0); } // Using a DependencyProperty as the backing store for HasText. This enables animation, styling, binding, etc... public static readonly DependencyProperty HasTextProperty = DependencyProperty.RegisterAttached("HasText", typeof(bool), typeof(PasswordProperties), new PropertyMetadata(false)); #endregion }
xmal: 绑定viewmodel中的Password属性
<PasswordBox local:PasswordProperties.MonitorPassword="True" local:PasswordProperties.AttachPassword="{Binding Password}" />
标签:obj,DependencyProperty,PasswordBox,static,WPF,Password,public,属性 来源: https://www.cnblogs.com/xuzhongjie/p/16688663.html
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