Application Framework to plug components - Part II - Notify Events

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Reflection;
using MathProxy;
namespace IntfDemo
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class frmIntfDemo : System.Windows.Forms.Form
	{
		IMath m_Math;
		MathEvents m_mathEvent;
		private System.Windows.Forms.TextBox txtValue1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.TextBox txtValue2;
		private System.Windows.Forms.Button btnDiv;
		private System.Windows.Forms.Button btnCreateIntf;
		public System.Windows.Forms.TextBox txtEventMsg;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

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

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
			m_mathEvent = new MathEvents();
			m_mathEvent.m_form = this;

		}

		/// <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.txtValue1 = new System.Windows.Forms.TextBox();
			this.txtValue2 = new System.Windows.Forms.TextBox();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.btnDiv = new System.Windows.Forms.Button();
			this.btnCreateIntf = new System.Windows.Forms.Button();
			this.txtEventMsg = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// txtValue1
			// 
			this.txtValue1.Location = new System.Drawing.Point(8, 56);
			this.txtValue1.Name = "txtValue1";
			this.txtValue1.Size = new System.Drawing.Size(56, 20);
			this.txtValue1.TabIndex = 0;
			this.txtValue1.Text = "";
			// 
			// txtValue2
			// 
			this.txtValue2.Location = new System.Drawing.Point(72, 56);
			this.txtValue2.Name = "txtValue2";
			this.txtValue2.Size = new System.Drawing.Size(56, 20);
			this.txtValue2.TabIndex = 1;
			this.txtValue2.Text = "";
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(72, 32);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(56, 16);
			this.label1.TabIndex = 4;
			this.label1.Text = "Value 2";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(8, 32);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(56, 16);
			this.label2.TabIndex = 5;
			this.label2.Text = "Value 1";
			// 
			// btnDiv
			// 
			this.btnDiv.Location = new System.Drawing.Point(136, 56);
			this.btnDiv.Name = "btnDiv";
			this.btnDiv.TabIndex = 6;
			this.btnDiv.Text = "Divide";
			this.btnDiv.Click += new System.EventHandler(this.btnDiv_Click);
			// 
			// btnCreateIntf
			// 
			this.btnCreateIntf.Location = new System.Drawing.Point(8, 0);
			this.btnCreateIntf.Name = "btnCreateIntf";
			this.btnCreateIntf.Size = new System.Drawing.Size(96, 23);
			this.btnCreateIntf.TabIndex = 7;
			this.btnCreateIntf.Text = "Create Interface";
			this.btnCreateIntf.Click += new System.EventHandler(this.btnCreateIntf_Click);
			// 
			// txtEventMsg
			// 
			this.txtEventMsg.Location = new System.Drawing.Point(8, 104);
			this.txtEventMsg.Name = "txtEventMsg";
			this.txtEventMsg.Size = new System.Drawing.Size(200, 20);
			this.txtEventMsg.TabIndex = 8;
			this.txtEventMsg.Text = "";
			// 
			// frmIntfDemo
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(224, 134);
			this.Controls.Add(this.txtEventMsg);
			this.Controls.Add(this.btnCreateIntf);
			this.Controls.Add(this.btnDiv);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.txtValue2);
			this.Controls.Add(this.txtValue1);
			this.Name = "frmIntfDemo";
			this.Text = "Interface Demo";
			this.Load += new System.EventHandler(this.frmIntfDemo_Load);
			this.ResumeLayout(false);

		}
		#endregion

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

		private static MethodInfo GetMethodInfo(string reflection)
		{
			MethodInfo mi=null;
			string[] info=reflection.Split(new char[] {'/'});
			Assembly mainAssembly=Assembly.LoadFrom(info[0]);
			Type type=mainAssembly.GetType(info[1]);
			mi=type.GetMethod(info[2]);
			return mi;
		}

		private void frmIntfDemo_Load(object sender, System.EventArgs e)
		{
			txtValue1.Text = "50";
			txtValue2.Text = "30";
		}

		private void btnDiv_Click(object sender, System.EventArgs e)
		{
			if (m_Math!=null)
			{
				int iRet;
				iRet = m_Math.CalcValues(int.Parse(txtValue1.Text.ToString()),int.Parse(txtValue2.Text.ToString()));
				MessageBox.Show( iRet.ToString() );
			}
			else
			{
				MessageBox.Show( "First create the interface" );
			}
		}

		private void btnCreateIntf_Click(object sender, System.EventArgs e)
		{
			if (m_Math==null)
			{
				MethodInfo mi=GetMethodInfo("MathEvents.dll/MathEvents.CreateIntf/CreateEx");
				object[] parms=new object[] {m_mathEvent};
				m_Math = (IMath)mi.Invoke(null, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.InvokeMethod | BindingFlags.Static, null, parms, null);
			}
			else
			{
				MessageBox.Show( "Interface Already Create" );
			}
		}
	}
	public class MathEvents : IMathEvent
	{
		public frmIntfDemo m_form;
		void IMathEvent.CalcErrorEvent(string s)
		{
			m_form.txtEventMsg.Text = s;
		}
	}
}