* UIPage：修复OnLoad在加载时重复加载两次的问题，增加Final函数，每次页面切换，退出页面都会执行

SunnyUI.Demo/Controls/FButton.cs

@@ -14,32 +14,39 @@ namespace Sunny.UI.Demo
         }
 
         /// <summary>
-        /// 放在 [窗体Load、重载OnLoad、重载Init] 的内容每次页面切换都会执行。
+        /// 放在 [窗体Load、重载OnLoad、重载Init] 的内容每次页面切换，进入页面都会执行。
         /// 这三个选一个用就行了。
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void FButton_Load(object sender, EventArgs e)
         {
-            uiSwitch1.Active = uiSwitch4.Active = true;
+            Console.WriteLine("1. FButton_Load");
-            uiSwitch2.Active = uiSwitch3.Active = false;
         }
 
-        //放在 [窗体Load、重载OnLoad、重载Init] 的内容每次页面切换都会执行。
+        //放在 [窗体Load、重载OnLoad、重载Init] 的内容每次页面切换，进入页面都会执行。
-        //protected override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
-        //{
+        {
-        //    base.OnLoad(e);
+            base.OnLoad(e);
-        //    uiSwitch1.Active = uiSwitch4.Active = true;
+            Console.WriteLine("3. FButton_OnLoad");
-        //    uiSwitch2.Active = uiSwitch3.Active = false;
+        }
-        //}
 
-        //放在 [窗体Load、重载OnLoad、重载Init] 的内容每次页面切换都会执行。
+        //放在 [窗体Load、重载OnLoad、重载Init] 的内容每次页面切换，进入页面都会执行。
-        //public override void Init()
+        public override void Init()
-        //{
+        {
-        //    base.Init();
+            base.Init();
-        //    uiSwitch1.Active = uiSwitch4.Active = true;
+            uiSwitch1.Active = uiSwitch4.Active = true;
-        //    uiSwitch2.Active = uiSwitch3.Active = false;
+            uiSwitch2.Active = uiSwitch3.Active = false;
-        //}
+
+            Console.WriteLine("2. FButton_Init");
+        }
+
+        //放在 [Final] 的内容每次页面切换，退出页面都会执行
+        public override void Final()
+        {
+            base.Final();
+            Console.WriteLine("4. FButton_Final");
+        }
 
         private void uiButton10_Click(object sender, EventArgs e)
         {

SunnyUI/Controls/UITabControl.cs

@@ -21,13 +21,13 @@
  * 2020-08-12: V2.2.7 标题垂直居中
 ******************************************************************************/
 
-using Sunny.UI.Win32;
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Windows.Forms;
+using Sunny.UI.Win32;
 
 namespace Sunny.UI
 {
@@ -127,7 +127,10 @@ namespace Sunny.UI
 
         public void AddPage(Guid guid, UITabControlMenu page) => Helper.AddPage(guid, page);
 
-        public string Version { get; }
+        public string Version
+        {
+            get;
+        }
 
         private Color _fillColor = UIColor.LightBlue;
         private Color tabBackColor = Color.FromArgb(56, 56, 56);
@@ -137,14 +140,20 @@ namespace Sunny.UI
         /// </summary>
         [DefaultValue(null)]
         [Description("获取或设置包含有关控件的数据的对象字符串"), Category("SunnyUI")]
-        public string TagString { get; set; }
+        public string TagString
+        {
+            get; set;
+        }
 
         /// <summary>
         /// 自定义主题风格
         /// </summary>
         [DefaultValue(false)]
         [Description("获取或设置可以自定义主题风格"), Category("SunnyUI")]
-        public bool StyleCustomMode { get; set; }
+        public bool StyleCustomMode
+        {
+            get; set;
+        }
 
         private HorizontalAlignment textAlignment = HorizontalAlignment.Center;
 
@@ -555,7 +564,10 @@ namespace Sunny.UI
 
         [DefaultValue(false)]
         [Description("多页面框架时，包含UIPage，在点击Tab页关闭时关闭UIPage"), Category("SunnyUI")]
-        public bool AutoClosePage { get; set; }
+        public bool AutoClosePage
+        {
+            get; set;
+        }
 
         internal void RemoveTabPage(int index)
         {
@@ -608,27 +620,44 @@ namespace Sunny.UI
         protected override void OnSelectedIndexChanged(EventArgs e)
         {
             base.OnSelectedIndexChanged(e);
-            Init(SelectedIndex);
+            Init();
             if (ShowActiveCloseButton && !ShowCloseButton)
             {
                 timer.Start();
             }
         }
 
-        public void Init(int index = 0)
+        private int LastIndex = 0;
+
+        public void Init()
         {
-            if (index < 0 || index >= TabPages.Count)
+            if (SelectedIndex < 0 || SelectedIndex >= TabPages.Count)
             {
                 return;
             }
 
-            if (SelectedIndex != index)
+            if (SelectedIndex >= 0)
-                SelectedIndex = index;
-
-            List<UIPage> pages = TabPages[SelectedIndex].GetControls<UIPage>();
-            foreach (var page in pages)
             {
-                page.ReLoad();
+                List<UIPage> pages;
+                if (LastIndex != SelectedIndex)
+                {
+                    if (LastIndex >= 0 && TabPages.Count > 0)
+                    {
+                        pages = TabPages[LastIndex].GetControls<UIPage>();
+                        foreach (var page in pages)
+                        {
+                            page.Final();
+                        }
+                    }
+
+                    LastIndex = SelectedIndex;
+                }
+
+                pages = TabPages[SelectedIndex].GetControls<UIPage>();
+                foreach (var page in pages)
+                {
+                    page.ReLoad();
+                }
             }
 
             List<UITabControlMenu> leftTabControls = TabPages[SelectedIndex].GetControls<UITabControlMenu>();
@@ -901,11 +930,20 @@ namespace Sunny.UI
                 MouseInUpButton = mouseInUpButton;
             }
 
-            public bool MouseOver { get; }
+            public bool MouseOver
+            {
+                get;
+            }
 
-            public bool MousePress { get; }
+            public bool MousePress
+            {
+                get;
+            }
 
-            public bool MouseInUpButton { get; }
+            public bool MouseInUpButton
+            {
+                get;
+            }
         }
     }
 }

SunnyUI/Pages/UIPage.cs

@@ -217,6 +217,7 @@ namespace Sunny.UI
         }
 
         public event EventHandler Initialize;
+        public event EventHandler Finalize;
 
         protected override void OnControlAdded(ControlEventArgs e)
         {
@@ -260,7 +261,7 @@ namespace Sunny.UI
 
         public virtual void Init()
         {
-            Initialize?.Invoke(this, null);
+            Initialize?.Invoke(this, new EventArgs());
         }
 
         protected override void OnLoad(EventArgs e)
@@ -292,6 +293,7 @@ namespace Sunny.UI
 
         public virtual void Final()
         {
+            Finalize?.Invoke(this, new EventArgs());
         }
 
         public void SetStyle(UIStyle style)