添加项目文件。

SamplePreSystem.UI/BaseControls/PasswordAttaExt.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace SamplePreSystem.UI.BaseControls
+{
+    public class PasswordAttaExt
+    {
+
+
+        public static string GetCustomPwd(DependencyObject obj)
+        {
+            return (string)obj.GetValue(CustomPwdProperty);
+        }
+
+        public static void SetCustomPwd(DependencyObject obj, string value)
+        {
+            obj.SetValue(CustomPwdProperty, value);
+        }
+
+        // Using a DependencyProperty as the backing store for CustomPwd.  This enables animation, styling, binding, etc...
+        public static readonly DependencyProperty CustomPwdProperty =
+            DependencyProperty.RegisterAttached("CustomPwd", typeof(string), typeof(PasswordAttaExt), new PropertyMetadata("", OnPropertyChangeBack));
+
+        private static void OnPropertyChangeBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            PasswordBox pb = d as PasswordBox;
+            if (pb != null)
+            {
+                if (e.NewValue.ToString() != pb.Password)
+                {
+                    pb.Password = e.NewValue.ToString();
+                }
+
+            }
+
+        }
+
+
+        #region 设置事件绑定触发条件
+
+
+        public static bool GetIsOpenPwdBading(DependencyObject obj)
+        {
+            return (bool)obj.GetValue(IsOpenPwdBadingProperty);
+        }
+
+        public static void SetIsOpenPwdBading(DependencyObject obj, bool value)
+        {
+            obj.SetValue(IsOpenPwdBadingProperty, value);
+        }
+
+        // Using a DependencyProperty as the backing store for IsOpenPwdBading.  This enables animation, styling, binding, etc...
+        public static readonly DependencyProperty IsOpenPwdBadingProperty =
+            DependencyProperty.RegisterAttached("IsOpenPwdBading", typeof(bool), typeof(PasswordAttaExt), new PropertyMetadata(false, OnValEventChangeBack));
+
+        private static void OnValEventChangeBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            PasswordBox pd = d as PasswordBox;
+            if (pd != null)
+            {
+                pd.PasswordChanged -= Pd_PasswordChanged;
+                pd.PasswordChanged += Pd_PasswordChanged;
+            }
+
+        }
+
+        private static void Pd_PasswordChanged(object sender, RoutedEventArgs e)
+        {
+            PasswordBox pb = sender as PasswordBox;
+            if (pb != null)
+            {
+                SetCustomPwd((DependencyObject)sender, pb.Password);
+
+            }
+
+        }
+
+
+        #endregion
+    }
+}