Creating Different code for different Clients

For software houses that maintain a product, there is the common problem of customer specific code.
Sometimes we need to create some specific implementation of a specific program for a specific client. The migrated code is designed using a plugin architecture, that allows you to implement this with ease.

We'll start by creating a new exe project that the customer will use - and call the original Northwind application.

Then we'll create our own client specific implementation of the ShowCustomers screen.

We'll register the new Controller with the AbstractFactory to return the customer implementation.

Creating the Client specific exe project

1. Add a new winforms project called 'Northwind.AClient'
2. Delete 'Form.cs' and 'App.Config' as we don't need them.
3. Delete the lines in the Main method in the Program class - we'll replace them later.
4. Change the build output to '..\bin' for both debug and release.
5. Add references:
   • From the Browse tab, select from the project's bin directory the following dlls:
     1. ENV
     2. Firefly.Box
     3. NorthwindBase
     4. (Northwind.Share for larger migrated solutions)

For more information see: Adding a new project to a migrated solution

5. change the program main to call the original Program main.

namespace Northwind.NewCustomer
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
-       static void Main()
        static void Main(string[] args)
        {
            Northwind.Program.Main(args);
        }
    }
} 

• Adding a customer specific implementation of a controller
• Adding a customer specific implementation of smaller bits of code

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