关于插件的例子

在网上想找个plugin的例子,找了很久才找到,写下以后查阅。

 public interface IPlugin
 {
  Int32 Add(Int32 a, Int32 b);
  string Name{get;set;}
  IPluginHost Host{get;set;}
  void Show();
 }

 /// <summary>
 /// The host
 /// </summary>
 public interface IPluginHost
 {
  bool Register(IPlugin ipi);
 }

 

 

 

class PlugIn : IPlugin
 {
  private string m_strName;
  private IPluginHost m_Host;
  
  public PlugIn()
  {
   m_strName = "Dynamic";
  }
  
  public Int32 Add(Int32 a, Int32 b)
  {return a + b;}
  
  public string Name
  {
            get
            {
                return m_strName;
            }
            set
            {
                m_strName=value;
            }
        }
  
  public void Show()
  {
   Main1 mn = new Main1();
   mn.ShowDialog();
  }

  public IPluginHost Host
  {
   get
            {
                return m_Host;
            }
   set
   {
    m_Host=value;
    m_Host.Register(this);
   }
  }
 }

 

 

 

using System.Configuration;
using System;
using System.IO;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using PlugIn;
using System.Reflection;

namespace PluginWindowTest
{
 /// <summary>
 /// Summary description for Form1.
 /// </summary>
 public class Form1 : System.Windows.Forms.Form, IPluginHost
 {
  private System.Windows.Forms.MainMenu mainMenu1;
  private System.Windows.Forms.MenuItem menuItem1;

  private IPlugin[] ipi;

  /// <summary>
  /// Required designer variable.
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Required for Windows Form Designer support
   //
   InitializeComponent();

   //
   // TODO: Add any constructor code after InitializeComponent call
   //
  }

  /// <summary>
  /// Clean up any resources being used.
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows Form Designer generated code
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {
   this.mainMenu1 = new System.Windows.Forms.MainMenu();
   this.menuItem1 = new System.Windows.Forms.MenuItem();
   //
   // mainMenu1
   //
   this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                       this.menuItem1});
   //
   // menuItem1
   //
   this.menuItem1.Index = 0;
   this.menuItem1.Text = "Plugin";
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
   this.ClientSize = new System.Drawing.Size(520, 357);
   this.Menu = this.mainMenu1;
   this.Name = "Form1";
   this.Text = "Form1";
   this.Load += new System.EventHandler(this.Form1_Load);

  }
  #endregion

  /// <summary>
  /// The main entry point for the application.
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  private void Form1_Load(object sender, System.EventArgs e)
  {
   string path = Application.StartupPath;
            MessageBox.Show(path);
   string[] pluginFiles = Directory.GetFiles(path, "*.dll");
   ipi = new IPlugin[pluginFiles.Length];
   for(int i=0; i<pluginFiles.Length; i++)
   {
    string args = pluginFiles[i].Substring(
     pluginFiles[i].LastIndexOf("//")+1,
     pluginFiles[i].IndexOf(".dll")-
     pluginFiles[i].LastIndexOf("//")-1);

    Type ObjType = null;
    //IPlugin ipi;
    // load the dll
    try
    {
     // load it
     Assembly ass = null;
     ass = Assembly.Load(args);
     if (ass != null)
     {
      ObjType = ass.GetType(args+".PlugIn");
     }
    }
    catch (Exception ex)
    {
     Console.WriteLine(ex.Message);
    }
    try
    {
     // OK Lets create the object as we have the Report Type
     if (ObjType != null)
     {
      ipi[i] = (IPlugin)Activator.CreateInstance(ObjType);
      ipi[i].Host = this;
      Console.WriteLine("ipi.Add(1,2)=" + ipi[i].Add(1,2));
     }
    }
    catch (Exception ex)
    {
     Console.WriteLine(ex.Message);
    }

    //    Start(assemname);
   }
   //MessageBox.Show(ConfigurationSettings.AppSettings["App"]);
  }

  public void Start(string args)
  {
   Type ObjType = null;
   IPlugin ipi;
   // load the dll
   try
   {
    // load it
    Assembly ass = null;
    ass = Assembly.Load(args);
    if (ass != null)
    {
     ObjType = ass.GetType(args+".PlugIn");
    }
   }
   catch (Exception ex)
   {
    Console.WriteLine(ex.Message);
   }
   try
   {
    // OK Lets create the object as we have the Report Type
    if (ObjType != null)
    {
     ipi = (IPlugin)Activator.CreateInstance(ObjType);
     ipi.Host = this;
     Console.WriteLine("ipi.Add(1,2)=" + ipi.Add(1,2));
    }
   }
   catch (Exception ex)
   {
    Console.WriteLine(ex.Message);
   }
  }

  public bool Register(IPlugin ipi)
  {
   MenuItem mn = new MenuItem(ipi.Name,new EventHandler(NewLoad));

   Console.WriteLine("Registered: " + ipi.Name);
   menuItem1.MenuItems.Add(mn);
   return true;
  }

  private void NewLoad(object sender, System.EventArgs e)
  {
   MenuItem mn = (MenuItem)sender;

   for(int i=0; i<ipi.Length; i++)
   {
    string strType = mn.Text;
    if(ipi[i]!=null)
    {
     if(ipi[i].Name==strType)
     {
      ipi[i].Show();
      break;
     }
    }
   }   
  }
 }
}

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