251029

FATrace.WPLApp/Models/PasswordBoxBehavior.cs

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+using Microsoft.Xaml.Behaviors;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace FATrace.WPLApp.Models
+{
+    public class PasswordBoxBehavior : Behavior<PasswordBox>
+    {
+        public static readonly DependencyProperty PasswordProperty =
+            DependencyProperty.Register("Password", typeof(string), typeof(PasswordBoxBehavior),
+                new FrameworkPropertyMetadata(string.Empty, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
+                    OnPasswordPropertyChanged));
+
+        private bool _isUpdating;
+
+        public string Password
+        {
+            get { return (string)GetValue(PasswordProperty); }
+            set { SetValue(PasswordProperty, value); }
+        }
+
+        private static void OnPasswordPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            var behavior = d as PasswordBoxBehavior;
+            if (behavior._isUpdating) return;
+
+            if (behavior.AssociatedObject != null)
+            {
+                behavior._isUpdating = true;
+                behavior.AssociatedObject.Password = e.NewValue?.ToString() ?? string.Empty;
+                behavior._isUpdating = false;
+            }
+        }
+
+        protected override void OnAttached()
+        {
+            base.OnAttached();
+            AssociatedObject.PasswordChanged += OnPasswordBoxValueChanged;
+        }
+
+        protected override void OnDetaching()
+        {
+            AssociatedObject.PasswordChanged -= OnPasswordBoxValueChanged;
+            base.OnDetaching();
+        }
+
+        private void OnPasswordBoxValueChanged(object sender, RoutedEventArgs e)
+        {
+            _isUpdating = true;
+            Password = AssociatedObject.Password;
+            _isUpdating = false;
+        }
+    }
+}