添加项目文件。

UIShare/Helpers/PasswordBoxHelper.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 UIShare.Helpers
+{
+    public static class PasswordBoxHelper
+    {
+        public static readonly DependencyProperty PasswordProperty =
+            DependencyProperty.RegisterAttached(
+                "Password",
+                typeof(string),
+                typeof(PasswordBoxHelper),
+                new FrameworkPropertyMetadata(
+                    string.Empty,
+                    FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
+                    OnPasswordPropertyChanged));
+
+        public static void SetPassword(DependencyObject d, string value)
+            => d.SetValue(PasswordProperty, value);
+
+        public static string GetPassword(DependencyObject d)
+            => (string)d.GetValue(PasswordProperty);
+
+        private static void OnPasswordPropertyChanged(
+            DependencyObject d,
+            DependencyPropertyChangedEventArgs e)
+        {
+            if (d is PasswordBox pb)
+            {
+                pb.PasswordChanged -= PasswordChanged;
+                if (pb.Password != (string)e.NewValue)
+                {
+                    pb.Password = (string)e.NewValue;
+                }
+                pb.PasswordChanged += PasswordChanged;
+            }
+        }
+
+        private static void PasswordChanged(object sender, RoutedEventArgs e)
+        {
+            if (sender is PasswordBox pb)
+            {
+                SetPassword(pb, pb.Password);
+            }
+        }
+    }
+}

UIShare/Helpers/WindowDragHelper.cs

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+using System.Windows;
+using System.Windows.Input;
+
+namespace UIShare.Helpers
+{
+    public static class WindowDragHelper
+    {
+        public static readonly DependencyProperty EnableWindowDragProperty =
+            DependencyProperty.RegisterAttached(
+                "EnableWindowDrag",
+                typeof(bool),
+                typeof(WindowDragHelper),
+                new PropertyMetadata(false, OnEnableWindowDragChanged));
+
+        public static bool GetEnableWindowDrag(DependencyObject obj) =>
+            (bool)obj.GetValue(EnableWindowDragProperty);
+
+        public static void SetEnableWindowDrag(DependencyObject obj, bool value) =>
+            obj.SetValue(EnableWindowDragProperty, value);
+
+        private static void OnEnableWindowDragChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            if (d is FrameworkElement element)
+            {
+                if ((bool)e.NewValue)
+                    element.MouseLeftButtonDown += Element_MouseLeftButtonDown;
+                else
+                    element.MouseLeftButtonDown -= Element_MouseLeftButtonDown;
+            }
+        }
+
+        private static void Element_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            if (sender is FrameworkElement element)
+            {
+                var window = Window.GetWindow(element);
+                window?.DragMove();
+            }
+        }
+    }
+}