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[kenenth88]

I've created a simple Managed Extensibility Framework calculator system that uses different dll file's containing method like subtraction, addition.

//API.cs

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

namespace API
{
public interface IPlugin
{
string DoAction(int x,int y);
string Name { get; }

}
}

//ClientApp.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;

namespace ClientApp
{
class ClientConsole
{
[ImportMany(typeof(API.IPlugin))]
private List<API.IPlugin> allPlugins;

public ClientConsole()
{
DirectoryCatalog catalog = new DirectoryCatalog(Environment.CurrentDirectory);
CompositionContainer worker = new CompositionContainer(catalog);
worker.ComposeParts(this);

}

public void DoActions()
{
foreach (var item in allPlugins)
{
Console.WriteLine(item.Name);
Console.WriteLine( item.DoAction(5,2));

}
}
}
class Program
{
static void Main(string[] args)
{
new ClientConsole().DoActions();
Console.ReadLine();
}
}
}


//MailPlugin.cs

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

namespace MainPlugin
{
[Export(typeof(API.IPlugin))]
public class Class1:API.IPlugin
{
public string DoAction(int x,int y)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.ForegroundColor = ConsoleColor.White;
x = x + y;

return Convert.ToString(x);
}

public string Name
{
get { return "Addition"; }
}
}
}


//Plugin2.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.Composition;
namespace Plugin2
{
[Export(typeof(API.IPlugin))]
public class Class1 : API.IPlugin
{
public string DoAction(int x, int y)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.ForegroundColor = ConsoleColor.White;
x = x - y;

return Convert.ToString(x);
}

public string Name
{
get { return "Subtraction"; }
}
}
}

Output:
addition
7
subtraction
3

something i want to do is to be able to choose which function only to use, like, out of the four available function add,subtract,multiply,divide, I will only use add and divide, each of this function are seperated in their own dll files.

what I was originally planning is to access the list of plugins from "List<API.IPlugin> allPlugins" and change the
" foreach (var item in allPlugins)
{
Console.WriteLine(item.Name);
Console.WriteLine( item.DoAction(5,2));

}"
into something where the program only runs the plugins I only choose and not loop and run everything. But I have no Idea how to access the list of plugins. Can any one enlighten me. I am quite new to this. Thank you