[转] 从 dll 程序集中动态加载窗体

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[转] 从 dll 程序集中动态加载窗体

2024-08-11 09:27:35 220人阅读

无涯原文从 dll 程序集中动态加载窗体 [原创]

　　昨天晚上花了一晚上时间写了一个从程序集中动态加载窗体的程序．将任何包含窗体的代码编译成 dll 文件，再把 dll 文件拷贝到本程序的目录下，本程序运行时即可动态检查到 dll 文件中的窗体，将窗体类的类型在程序菜单中显示出来，点击菜单即可运行对应的窗体．

　　本程序主要用到了 Assembly 类动态加载程序集，再得到程序集中包含类的 Type 类型，动态生成类实例，动态调用类方法．个人觉得这是一种提供高度松耦合，可随意扩展的程序结构框架，希望和大家探讨一下这种框架的应用前景！

　　关键性代码如下：

using System;using System.Drawing;using System.IO;using System.Reflection;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;namespace WindowsFormTest{    /// <summary>    /// Form1 的摘要说明。    /// </summary>    public class FrmMain : System.Windows.Forms.Form    {        private int formNum;        private ArrayList formTypes = new ArrayList();        private ArrayList formObjects = new ArrayList();        private System.Windows.Forms.MainMenu mnuMain;        private System.Windows.Forms.MenuItem mnuItmRun;        private System.Windows.Forms.MenuItem mnuItemWindow;        private System.Windows.Forms.MenuItem mnuItmHelp;        private System.Windows.Forms.MenuItem mnuItmCascade;        private System.Windows.Forms.MenuItem mnuItmTileHorizontal;        private System.Windows.Forms.MenuItem mnuItmTileVertical;        private System.Windows.Forms.MenuItem menuItem1;        private System.Windows.Forms.MenuItem mnuItmAbout;        private System.Windows.Forms.StatusBar staBarMain;        private System.Windows.Forms.StatusBarPanel pnlInfo;        private System.Windows.Forms.StatusBarPanel pnlNum;        /// <summary>        /// 必需的设计器变量。        /// </summary>        private System.ComponentModel.Container components = null;        public FrmMain()        {            //            // Windows 窗体设计器支持所必需的            //            InitializeComponent();            //            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码            //        }        /// <summary>        /// 清理所有正在使用的资源。        /// </summary>        protected override void Dispose( bool disposing )        {            if( disposing )            {                if (components != null)                 {                    components.Dispose();                }            }            base.Dispose( disposing );        }        Windows 窗体设计器生成的代码        private void FrmMain_Load(object sender, System.EventArgs e)        {            Assembly assembly = null;            string windowsPath = Path.Combine(Application.StartupPath, "Windows");            foreach (string dllFile in Directory.GetFiles(windowsPath, "*.dll"))            {                assembly = Assembly.LoadFile(dllFile);                Type[] types = assembly.GetTypes();                                foreach (Type t in types)                {                    if (t.BaseType == typeof(Form))                    {                        this.formTypes.Add(t);                        MenuItem item = this.mnuItmRun.MenuItems.Add(t.FullName);                        item.Click += new EventHandler(menuItemNewItem_Click);                    }                }            }        }        private void menuItemNewItem_Click(object sender, EventArgs e)        {            MenuItem item = (MenuItem)sender;            Type t = (Type)(this.formTypes[item.Index]);            Object obj = Activator.CreateInstance(t);            this.formObjects.Add(obj);            formNum += 1;            t.InvokeMember("MdiParent", BindingFlags.SetProperty, null, obj, new object[] {this});            t.InvokeMember("Text", BindingFlags.SetProperty, null, obj, new object[] {t.FullName+"  窗体："+formNum});            t.InvokeMember ("Show", BindingFlags.InvokeMethod, null, obj, new object [] {});            ((Form)obj).Closing += new CancelEventHandler(FrmWindow_Closing);            ((Form)obj).Activated += new EventHandler(FrmWindow_Activated);            MenuItem menuItem = this.mnuItemWindow.MenuItems.Add(((Form)obj).Text);            menuItem.Click += new EventHandler(menuItemWindow_Click);            this.pnlNum.Text = "当前装载了"+this.formObjects.Count+"个窗体";            this.pnlInfo.Text = "当前活动窗体："+this.ActiveMdiChild.Text;        }        private void menuItemWindow_Click(object sender, System.EventArgs e)        {            MenuItem item = (MenuItem)sender;            ((Form)(this.formObjects[item.Index-4])).Activate();            this.pnlNum.Text = "当前装载了"+this.formObjects.Count+"个窗体";            this.pnlInfo.Text = "当前活动窗体："+this.ActiveMdiChild.Text;        }        private void FrmWindow_Activated(object sender, System.EventArgs e)        {            this.pnlNum.Text = "当前装载了"+this.formObjects.Count+"个窗体";            this.pnlInfo.Text = "当前活动窗体："+this.ActiveMdiChild.Text;        }        private void FrmWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)        {            for (int i=0; i<this.formObjects.Count; i++)            {                if (((Form)this.formObjects[i]).Text == ((Form)sender).Text)                {                    this.formObjects.RemoveAt(i);                    this.mnuItemWindow.MenuItems.RemoveAt(i+4);                    this.pnlNum.Text = "当前装载了"+this.formObjects.Count+"个窗体";                    this.pnlInfo.Text = "当前活动窗体："+this.ActiveMdiChild.Text;                    break;                }            }        }        private void mnuItmCascade_Click(object sender, System.EventArgs e)        {            this.LayoutMdi(MdiLayout.Cascade);        }        private void mnuItmTileHorizontal_Click(object sender, System.EventArgs e)        {            this.LayoutMdi(MdiLayout.TileHorizontal);        }        private void mnuItmTileVertical_Click(object sender, System.EventArgs e)        {            this.LayoutMdi(MdiLayout.TileVertical);        }        private void mnuItmAbout_Click(object sender, System.EventArgs e)        {            new FrmAbout().ShowDialog(this);        }    }}