c# winform外掛程式

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外掛程式介面

namespace IMsg{    ///<summary>    /// 這是外掛程式必須實現的介面，也是主程式與外掛程式通訊的唯一介面    /// 換句話說，主程式只認識外掛程式裡的這些方法    ///</summary>    public interface IMsgPlug    {        /// <summary>        /// 顯示表單        /// </summary>        void OnShowDlg();        /// <summary>        /// 顯示資訊        /// </summary>        /// <returns></returns>        string OnShowInfo();    }}

外掛程式1

using IMsg;using System;namespace MYPlugin1{    public class myConsole : IMsgPlug    {        #region IMsgPlug 成員        public void OnShowDlg()        {            Console.WriteLine("控制台調用外掛程式的OnShowDlg方法");        }        public string OnShowInfo()        {            return "myConsole";        }        #endregion    }}

外掛程式2

using IMsg;using System.Windows.Forms;namespace MYPlugin1{    public class MYDlg : Form, IMsgPlug    {        #region IMsgPlug 成員        public void OnShowDlg()        {            this.Text = "外掛程式子表單";            this.ShowDialog();//調用Form的ShowDialog,顯示表單        }        public string OnShowInfo()        {            return "MyDlg";        }        #endregion    }}

winform調用外掛程式

using System;using System.Collections;using System.IO;using System.Reflection;using System.Windows.Forms;namespace MsgBoxMain{    public partial class FormMain : Form    {        ///<summary>        /// 存放外掛程式的集合        ///</summary>        private ArrayList plugins = new ArrayList();        public FormMain()        {            InitializeComponent();        }        ///<summary>        /// 載入所有外掛程式        ///</summary>        private void LoadAllPlugs()        {            //擷取外掛程式目錄(plugins)下所有檔案夾            DirectoryInfo dirs = new DirectoryInfo(Application.StartupPath + @"\Plugins");            foreach (DirectoryInfo dir in dirs.GetDirectories())            {                //擷取檔案夾下檔案                string[] files = Directory.GetFiles(dir.FullName);                foreach (string file in files)                {                    if (file.ToUpper().EndsWith(".DLL"))                    {                        try                        {                            //載入dll                            Assembly ab = Assembly.LoadFrom(file);                            Type[] types = ab.GetTypes();                            foreach (Type t in types)                            {                                //如果某些類實現了預定義的IMsg.IMsgPlug介面，則認為該類適配與主程式(是主程式的外掛程式)                                if (t.GetInterface("IMsgPlug") != null)                                {                                    plugins.Add(ab.CreateInstance(t.FullName));                                    listBox1.Items.Add(t.FullName);                                }                            }                        }                        catch (Exception ex)                        {                            MessageBox.Show(ex.Message);                        }                    }                }            }        }        private void btnLoadPlug_Click(object sender, EventArgs e)        {            LoadAllPlugs();        }        //調用外掛程式的方法        private void btnExecute_Click(object sender, EventArgs e)        {            if (this.listBox1.SelectedIndex == -1) return;            object selObj = this.plugins[this.listBox1.SelectedIndex];            Type t = selObj.GetType();            MethodInfo OnShowDlg = t.GetMethod("OnShowDlg");            MethodInfo OnShowInfo = t.GetMethod("OnShowInfo");            OnShowDlg.Invoke(selObj, null);            object returnValue = OnShowInfo.Invoke(selObj, null);            this.lblMsg.Text = returnValue.ToString();        }    }}

介面

c# winform外掛程式