实战基础技能(14)--------WPF之插件开发

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IMsg
{
    ///<summary>
/// 这是插件必须实现的接口，也是主程序与插件通信的唯一接口
/// 换句话说，主程序只认识插件里的这些方法
///</summary>
    public interface IMsgPlug
    {
        void OnShowDlg();
        string OnShowInfo();
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using IMsg;
namespace MYPlugin1
{
    public class myConsole : IMsgPlug
    {
        #region IMsgPlug 成员
        public void OnShowDlg()
        {
            Console.WriteLine("控制台调用插件的OnShowDlg方法");
        }
        public string OnShowInfo()
        {
            return "myConsole";
        }
        #endregion
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using IMsg;
namespace MYPlugin1
{
    public class MYDlg : Form, IMsgPlug
    {
        #region IMsgPlug 成员

        public void OnShowDlg()
        {
            this.Text = "插件子窗体";
            this.ShowDialog();//调用Form的ShowDialog,显示窗体
        }
        public string OnShowInfo()
        {
            return "MyDlg";
        }
        #endregion
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Collections;
using System.IO;
using System.Reflection;

namespace 插件式开发
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
         // 存放插件的集合
         private ArrayList plugins =new ArrayList();

        public MainWindow()
        {
            InitializeComponent();
        }
        ///<summary>
        /// 载入所有插件
        ///</summary>
        private void LoadAllPlugs()
        {
            //获取插件目录(plugins)下所有文件
           // string[] files = Directory.GetFiles(Application.ResourceAssembly + @"\plugins");        
            //string str6 = AppDomain.CurrentDomain.SetupInformation.ApplicationBase;//获得到debug的文件夹
            //str6 = System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName;//获得到exe文件
            //str6 = System.Environment.CurrentDirectory;//获得到debug的文件夹
            //str6 = System.IO.Directory.GetCurrentDirectory();//获得到debug的文件夹
            //str6 = System.AppDomain.CurrentDomain.BaseDirectory;//获得到debug的文件夹
            //str6 = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;//获得到debug的文件夹
            //str6 = System.Windows.Forms.Application.StartupPath;//获得到debug的文件夹
             //string[] files = Directory.GetFiles(AppDomain.CurrentDomain +"plugins");

            string[] files = Directory.GetFiles(@"E:\练习代码\IMsg\插件式开发\plugins");//得到dll文件的存放路径
            foreach (string file in files)
            {
                if (file.ToUpper().EndsWith(".DLL"))//如果文件以dll结尾
                {
                    try
                    {
                        //载入dll
                        Assembly ab = Assembly.LoadFrom(file);//一个程序集合
                        Type[] types = ab.GetTypes();//类型数组
                        foreach (Type t in types)
                        {
                            //如果某些类实现了预定义的IMsg.IMsgPlug接口，则认为该类适配与主程序(是主程序的插件)
                            if (t.GetInterface("IMsgPlug") != null)
                            {
                                plugins.Add(ab.CreateInstance(t.FullName));//将实例化的dll加入到泛型集合中
                                lstWays.Items.Add(t.FullName);//显示在listbox中
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
            }
        }

      
        //窗体载入事件
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            LoadAllPlugs();
        }

        //调用插件的方法
        private void btnGetIn_Click(object sender, RoutedEventArgs e)
        {
            if (this.lstWays.SelectedIndex == -1) return;
            object selObj = this.plugins[this.lstWays.SelectedIndex];
            Type t = selObj.GetType();
            MethodInfo OnShowDlg = t.GetMethod("OnShowDlg");//得到dll文件的中的方法
            MethodInfo OnShowInfo = t.GetMethod("OnShowInfo");//得到dll文件的中的方法

            OnShowDlg.Invoke(selObj, null);//方法调用参数
            object returnValue = OnShowInfo.Invoke(selObj, null);
        }
    }
}