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What is the difference between CCW and RCW ?

Saturday, June 27, 2009

Sno	CCW	RCW
1	COM to .NET communication happens through COM Callable Wrapper	.NET to COM Communication happens through Remote Callable Wrappter

What is the difference between CCW and RCW ?

Sno	CCW	RCW
1	COM to .NET communication happens through COM Callable Wrapper	.NET to COM Communication happens through Remote Callable Wrappter

How to invoke a method at runtime using Reflection in c#?

You need to call “InvokeMember” method of Reflection to do this.

Let us see this in detail with an example,

1. Create a Class library program and paste the code below,

Reflection Source Program
=========================

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

namespace Employee
{
public class EmployeeDetails
{
private int empid=1;
private string empname="Ram";
private float salary=100000;

public string displayEmployeeDetails()
{
return "Empoyee Id:" + empid + "
" + "Empoyee Name:" + empname + "
" + "Empoyee salary:" + salary + "
";
}
}
}

2. compile it.

3. then create a windows application project and paste the following code

Reflection Program to invoke the method
==================================================
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using Employee;

namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
Assembly assembly = Assembly.LoadFrom("E:\\WebExperiments\\Employee\\Employee\\bin\\Debug\\Employee.dll");
foreach (Type type in assembly.GetTypes())
{
// Pick up a class
if (type.IsClass == true)
{
Console.WriteLine("...Found Class : {0}", type.FullName);

}

object ibaseObject = Activator.CreateInstance(type);

object result = null;

result = type.InvokeMember("displayEmployeeDetails",
BindingFlags.Default | BindingFlags.InvokeMethod,
null,
ibaseObject, null);
MessageBox.Show(result.ToString() );
}
}
}
}

4. add reference to the Employee dll

5. run the program and see the method invoked.