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Posted 3 Aug 2003

Plugin Architecture using C#

, 3 Aug 2003 CPOL
How to make plugins to work with .NET
Dynamic.dll
PluginWindowTest.exe
Dynamic2.exe
Dynamic2.dll
PlugIn.dll
DynamicWnd
App.ico
DynamicWnd.csproj.user
obj
Debug
TempPE
temp
bin
Debug
Dynamic2
App.ico
Dynamic2.csproj.user
obj
Debug
TempPE
temp
bin
Debug
Dynamic
App.ico
Dynamic.csproj.user
obj
Debug
TempPE
temp
bin
Debug
PlugIn
PlugIn.csproj.user
obj
Debug
TempPE
temp
bin
Debug
PlugInTest
App.ico
PlugInTest.csproj.user
obj
Debug
TempPE
temp
bin
Debug
PluginWindowTest
App.ico
PluginWindowTest.csproj.user
obj
Debug
TempPE
temp
bin
Debug
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;
			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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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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shokisingh
Team Leader
India India
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