改进

ContextMenuManager/BluePointLilac.Controls/MyListBox.cs

@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System.Drawing;
 using System.Windows.Forms;
+using ContextMenuManager.Methods;
 
 namespace BluePointLilac.Controls
 {
@@ -42,7 +43,46 @@ public MyList()
             this.DoubleBuffered = true;
             this.AutoSizeMode = AutoSizeMode.GrowAndShrink;
         }
-
+        // MyList 基类 控件仓库(缓存) 
+        private Dictionary<string, MyCustomList<MyListItem>> itemRepo = new Dictionary<string, MyCustomList<MyListItem>>();
+        // 重置仓库的 Idx
+        protected void ResetRepo()
+        {
+            foreach (string className in itemRepo.Keys)
+                itemRepo[className].Idx = 0;
+        }
+        // 从仓库获取控件
+        protected bool GetFromRepo(string itemClassName,out MyListItem ret)
+        {
+            if (itemRepo.TryGetValue(itemClassName, out MyCustomList<MyListItem> itemlist))
+            {
+                for (int i = itemlist.Idx; i < itemlist.Count; i++)
+                {
+                    MyListItem ctr = itemlist[i];
+                    if (ctr.Parent == null)
+                    {
+                        ret = ctr;
+                        itemlist.Idx = i + 1;
+                        return true;
+                    }
+                }
+                itemlist.Idx = itemlist.Count;
+            }
+            ret = null;
+            return false;
+        }
+        // 保存控件到缓存
+        protected void SaveToRepo(string itemClassName,MyListItem ctr)
+        {
+            if (!itemRepo.TryGetValue(itemClassName, out MyCustomList<MyListItem> itemlist)||itemlist==null)
+            {
+                itemlist = new MyCustomList<MyListItem>();
+                itemRepo[itemClassName] = itemlist;
+            }
+            itemlist.Add(ctr);
+            // 表示控件可重用
+            ctr.Reuse = true;
+        }
         private MyListItem hoveredItem;
         public MyListItem HoveredItem
         {
@@ -117,6 +157,14 @@ public virtual void ClearItems()
             {
                 Control ctr = this.Controls[i];
                 this.Controls.Remove(ctr);
+                // 不销毁 Reuse=true的控件
+                if (ctr is MyListItem myListItem)
+                {
+                    if (myListItem.Reuse)
+                    {
+                        continue;
+                    }
+                }
                 ctr.Dispose();
             }
             this.ResumeLayout();
@@ -168,7 +216,8 @@ public MyListItem()
             AddCtr(pnlScrollbar, 0);
             this.ResumeLayout();
         }
-
+        // 需要重用,不能销毁(Dispose)
+        public bool Reuse { get; set; } = false;
         public Image Image
         {
             get => picImage.Image;

ContextMenuManager/ContextMenuManager.csproj

@@ -8,7 +8,7 @@
     <OutputType>WinExe</OutputType>
     <RootNamespace>ContextMenuManager</RootNamespace>
     <AssemblyName>ContextMenuManager</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <Deterministic>true</Deterministic>
@@ -196,6 +196,7 @@
     <Compile Include="BluePointLilac.Controls\UAWebClient.cs">
       <SubType>Component</SubType>
     </Compile>
+    <Compile Include="Methods\MyUtils.cs" />
     <Compile Include="Methods\UwpHelper.cs" />
     <Compile Include="BluePointLilac.Methods\WinOsVersion.cs" />
     <Compile Include="BluePointLilac.Methods\ShellLink.cs" />

ContextMenuManager/Controls/ShellExItem.cs

@@ -49,6 +49,12 @@ public ShellExItem(Guid guid, string regPath)
             this.Guid = guid;
             this.RegPath = regPath;
         }
+        public void ReInit(Guid guid, string regPath1)
+        {
+            // InitializeComponents();
+            this.Guid = guid;
+            this.RegPath = regPath1;
+        }
 
         private string regPath;
         public string RegPath

ContextMenuManager/Controls/ShellItem.cs

@@ -36,7 +36,12 @@ public ShellItem(string regPath)
             InitializeComponents();
             this.RegPath = regPath;
         }
-
+        // 重新初始化
+        public void ReInit(string regPath1)
+        {
+            // InitializeComponents();
+            this.RegPath = regPath1;
+        }
         private string regPath;
         public string RegPath
         {

ContextMenuManager/Controls/ShellList.cs

@@ -171,9 +171,37 @@ private static string CurrentExtensionPerceivedType
         private static string GetPerceivedType(string extension) => Registry.GetValue($@"{RegistryEx.CLASSES_ROOT}\{extension}", "PerceivedType", null)?.ToString();
 
         public Scenes Scene { get; set; }
-
+        // 获取一个实例,可能是新建的或重用的; 先从仓库(缓存)中获取,没有则新建
+        private void Gen_ShellItem(out ShellItem ret,string regPath)
+        {
+            if (this.GetFromRepo("ShellItem",out MyListItem myListItem))
+            {
+                ret = (ShellItem)myListItem;
+                // 更新控件信息
+                ret.ReInit(regPath);
+            }
+            else
+            {
+                ret = new ShellItem(regPath);
+                this.SaveToRepo("ShellItem", ret);
+            }
+        }
+        private void Gen_ShellExItem(out ShellExItem ret,Guid guid, string regPath)
+        {
+            if (this.GetFromRepo("ShellExItem",out MyListItem myListItem))
+            {
+                ret = (ShellExItem)myListItem;
+                ret.ReInit(guid,regPath);
+            }
+            else
+            {
+                ret = new ShellExItem(guid,regPath);
+                this.SaveToRepo( "ShellExItem", ret);
+            }
+        }
         public void LoadItems()
         {
+            ResetRepo();
             string scenePath = null;
             switch(Scene)
             {
@@ -296,7 +324,9 @@ private void LoadShellItems(string shellPath)
                 RegTrustedInstaller.TakeRegTreeOwnerShip(shellKey.Name);
                 foreach(string keyName in shellKey.GetSubKeyNames())
                 {
-                    this.AddItem(new ShellItem($@"{shellPath}\{keyName}"));
+                    // this.AddItem(new ShellItem($@"{shellPath}\{keyName}"));
+                    this.Gen_ShellItem(out ShellItem shellItem,$@"{shellPath}\{keyName}");
+                    this.AddItem(shellItem);
                 }
             }
         }
@@ -321,7 +351,8 @@ private void LoadShellExItems(string shellExPath)
                     string keyName = RegistryEx.GetKeyName(path);
                     if(!names.Contains(keyName))
                     {
-                        ShellExItem item = new ShellExItem(dic[path], path);
+                        // ShellExItem item = new ShellExItem(dic[path], path);
+                        this.Gen_ShellExItem(out ShellExItem item, dic[path], path);
                         if(groupItem != null)
                         {
                             item.FoldGroupItem = groupItem;

ContextMenuManager/Methods/MyUtils.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+
+namespace ContextMenuManager.Methods
+{
+    // List带一个Idx属性
+    public class MyCustomList<T>: List<T>
+    {
+
+        public MyCustomList():base(100)
+        {
+        }
+        public MyCustomList(int n):base(n)
+        {
+        }
+        // 列表迭代时起点索引
+        private int idx=0;
+
+        public int Idx
+        {
+            get => idx;
+            set => idx = value;
+        }
+    }
+}