封装：WPF中可以绑定的BindPassWord控件

原文:封装：WPF中可以绑定的BindPassWord控件

一、目的：本身自带的PassWord不支持绑定

二、Xaml部分

<UserControl x:Class="HeBianGu.General.WpfControlLib.BindPassWordBox"





             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"





             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"





             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 





             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 





             xmlns:local="clr-namespace:HeBianGu.General.WpfControlLib"





             mc:Ignorable="d" 





             d:DesignHeight="50" d:DesignWidth="300">





    <Grid>





        <PasswordBox x:Name="pb_center" PasswordChanged="pb_center_PasswordChanged" />





    </Grid>





</UserControl>

三、代码部分

/// <summary> 可以绑定的密码框 </summary>





    public partial class BindPassWordBox : UserControl





    {





        PasswordBox _password = null;





 





        private void pb_center_PasswordChanged(object sender, RoutedEventArgs e)





        {





            this.PassWord = this._password.Password;





        }





 





 





        public BindPassWordBox()





        {





            InitializeComponent();





        }





 





        public string PassWord





        {





            get { return (string)GetValue(PassWordProperty); }





            set { SetValue(PassWordProperty, value); }





        }





 





        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...





        public static readonly DependencyProperty PassWordProperty =





            DependencyProperty.Register("PassWord", typeof(string), typeof(BindPassWordBox), new PropertyMetadata(default(string), (d, e) =>





             {





                 BindPassWordBox control = d as BindPassWordBox;





 





                 if (control == null) return;





 





                 string config = e.NewValue as string;





 





                 if (control._password == null) return;





 





                 control._password.Password = config;





                 





                 SetPasswordBoxSelection(control._password, config.Length, 0);





             }));





 





 





        private static void SetPasswordBoxSelection(PasswordBox passwordBox, int start, int length)





        {





            var select = passwordBox.GetType().GetMethod("Select",





                            BindingFlags.Instance | BindingFlags.NonPublic);





 





            select.Invoke(passwordBox, new object[] { start, length });





        }





    }

四、原理

封装一层PassWordBox控件，自定义依赖属性，在PassWordBox的Changed事件中赋值依赖属性

SetPasswordBoxSelection(control._password, config.Length, 0);

此方法用来设置光标，否则输入后光标位置不正确