using System; using System.Windows; namespace Test {     /// <summary>     /// MainWindow.xaml 的交互逻辑     /// </summary>    public partial class MainWindow : Window    {        public MainWindow ()        {            InitializeComponent();             // myControl 是 MainWindow.xaml 中定义的控件实例             // 对应创建的自定义控件 MyControl            myControl.MyTitle = "我是窗口" ;        }        private void Button_Click (object sender, RoutedEventArgs e)        {             // 点击按钮时更新依赖属性            myControl.MyTitle = textBox.Text;        }

      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"        xmlns:local="clr-namespace:Test"        mc:Ignorable="d"        Title="MainWindow" Height="450" Width="800">        <StackPanel Margin="20">        <!-- 利用依赖属性生成一个自定义控件myControl -->        <!-- local:MyControl x:Name="myControl" => 在Test命名空间中找一个叫MyControl的类 -->        <!-- 这里的依赖属性是Title -->        <local:MyControl x:Name="myControl" MyTitle="初始标题" Height="50"/>        <!-- 一个文本框 -->        <TextBox x:Name="textBox" Margin="0,10,0,0" Height="30"/>        <!-- 一个按钮 -->

// 输入propdp，然后连续按两下Tab键，VS会帮我们自动生成下面的这段代码    public int MyProperty    {        get { return ( int )GetValue(MyPropertyProperty); }         set { SetValue(MyPropertyProperty, value); }    }     // Using a DependencyProperty as the backing store for MyProperty.       // This enables animation, styling, binding, etc...    public static readonly DependencyProperty MyPropertyProperty =        DependencyProperty.Register(         "MyProperty" ,

public static int GetMyProperty (DependencyObject obj)    {         return ( int )obj.GetValue(MyPropertyProperty);    }    public static void SetMyProperty (DependencyObject obj, int value)    {        obj.SetValue(MyPropertyProperty, value);    }     // Using a DependencyProperty as the backing store for MyProperty.       //This enables animation, styling, binding, etc...    public static readonly DependencyProperty MyPropertyProperty =        DependencyProperty.RegisterAttached(             "MyProperty" ,

/* MainWindow.xaml.cs */ using System.Windows; namespace TT {     /// <summary>     /// MainWindow.xaml 的交互逻辑     /// </summary>    public partial class MainWindow : Window    {        public MainWindow ()        {            InitializeComponent();        }        private void Button_Click (object sender, RoutedEventArgs e)        {             // 获取附加属性值             string password = PasswordHelper.GetPassword(pwdBox);             // 消息弹窗打印            MessageBox.Show($ "当前密码：{password}" );

using System; using System.Windows; using System.Windows.Controls; namespace TT {    public static class PasswordHelper    {        public static readonly DependencyProperty PasswordProperty =            DependencyProperty.RegisterAttached(                 "Password" ,                typeof( string ),                typeof(PasswordHelper),                 // string.Empty相当于默认值 = ""                 // C/C++程序员请注意：C#中 "" ≠ null                 // new PropertyMetadata(string.Empty, OnPasswordChanged));                new PropertyMetadata(null, OnPasswordChanged));        public static string GetPassword (DependencyObject obj)        {             return ( string )obj.GetValue(PasswordProperty);        }        public static void SetPassword (DependencyObject obj, string value)        {            obj.SetValue(PasswordProperty, value);        }         // 改变回调        private static void OnPasswordChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)        {             if (d is PasswordBox passwordBox)            {                 // 同步到真实 Password                 if (passwordBox.Password != ( string )e.NewValue)                {                    passwordBox.Password = ( string )e.NewValue;                }                 // 注册事件（先移除，避免重复）                passwordBox.PasswordChanged -= PasswordBox_PasswordChanged;                passwordBox.PasswordChanged += PasswordBox_PasswordChanged;            }        }gimqsb.txzf-pay.com        private static void PasswordBox_PasswordChanged (object sender, RoutedEventArgs e)        {

PasswordBox.Password  ←→  附加属性 Password  ←→  ViewModel.VMod.Password MVVM ├─ App.xaml                     # 应用入口：声明应用级资源并指定启动窗口 │ ├─ Views │  ├─ MainWindow.xaml           # 界面声明：定义 PasswordBox，并通过附加属性绑定 ViewModel 的 Password │  └─ MainWindow.xaml.cs        # 界面逻辑：初始化窗口并设置 DataContext │ ├─ ViewModel │  └─ VMod.cs       # 视图模型：定义 Password 状态并实现属性变更通知 │

<Window x:Class="MVVM.Views.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"        xmlns:local="clr-namespace:MVVM.Helpers"        mc:Ignorable="d"    rsvcao.txzf-pay.com        Title="MainWindow" Height="450" Width="800">    <StackPanel Margin="20">        <PasswordBox            local:PasswordHelper.Password="{Binding Password, Mode=TwoWay}" />        <Button Content="读取密码"                Margin="0,10,0,0"                Click="Button_Click"/>

using MVVM.ViewModel; using MVVM.Helpers; namespace MVVM.Views {     /// <summary>     /// Interaction logic for MainWindow.xaml     /// </summary>    public partial class MainWindow : Window    {        public MainWindow ()        {            InitializeComponent();            DataContext = new VMod();        }        private void Button_Click (object sender, RoutedEventArgs e)        {            var vm = (VMod)DataContext;            MessageBox.Show(vm.Password);

using System.Windows;tk.txzf-pay.com using System.Windows.Controls; namespace MVVM.Helpers {    public static class PasswordHelper    {        public static readonly DependencyProperty PasswordProperty =            DependencyProperty.RegisterAttached(                 "Password" ,                typeof( string ),wap.txzf-pay.com                typeof(PasswordHelper),m.txzf-pay.com                new FrameworkPropertyMetadata(                     string .Empty,                     //null,                    FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,                    OnPasswordChanged));txzf-pay.com        public static void SetPassword (DependencyObject obj, string value)        {            obj.SetValue(PasswordProperty, value);stuczd.txzf-pay.com        }        public static string GetPassword (DependencyObject obj)        {             return ( string )obj.GetValue(PasswordProperty);        }wap.kruez.com        private static void OnPasswordChanged (DependencyObject d, DependencyPropertyChangedEventArgs e)        {             if (d is not PasswordBox box)                 return ;            box.PasswordChanged -= PasswordBox_PasswordChanged;             if (box.Password != ( string )e.NewValue)            { obq.txzf-pay.com                box.Password = ( string )e.NewValue;rfux.txzf-pay.com            } lnkwbi.txzf-pay.com            box.PasswordChanged += PasswordBox_PasswordChanged;        }m.kruez.com        private static void PasswordBox_PasswordChanged (object sender, RoutedEventArgs e)        {            var box = (PasswordBox)sender;            SetPassword(box, box.Password);

sing System.ComponentModel; namespace MVVM.ViewModel {    public class VMod: INotifyPropertyChanged    {        private string ? _password;        public string ? Password        {            get => _password;             set            {                 if (_password == value) return ;                _password = value;ldozxw.txzf-pay.com                OnPropertyChanged(nameof(Password));            }        }kruez.com        public event PropertyChangedEventHandler? PropertyChanged; rrs.txzf-pay.com        protected void OnPropertyChanged ( string name)        {            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));