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Inversion of Control

Tasks

Apply Inversion of Control to your AspNetCoreKata.

Note: as you complete steps, you should make commits for the changes made, unless it doesn't make sense to do so. For example, DO NOT commit your connection string to Git.

Step 1

We don't want to store the secure connection string in Git, since this is considered an insecure, bad practice. Move your connection string to your appsettings.json file:

Step A

Move your appsettings.Development.json file out of your working directory (perhaps move it to your Desktop temporarily)

Step B

Commit the "deletion" of that file from Git.

Step C

Open your .gitignore file and add this somewhere in that file:

# ignore appsettings
**/appsettings.development.json
**/appsettings.staging.json
**/appsettings.production.json

Now, a file matching this description will be ignored by Git.

Step D

Move your appsettings.Development.json file back into your working directory

If you run git status, you'll see this file doesn't show up as "added" or "modified". Because it's ignored, you don't have to worry about committing sensitive information.

Step E

Add your connection string to your appsettings.Development.json file and a corresponding "Bread Crumb" value within your appsettings.json file.

Step 2

Add a class library for your Product Repository so that you can move the Model out of your Controller.

  1. Create a new .NET Core class library called AspNetCoreKata.ProductRepo
  2. Copy the IProductRepository, ProductRepository, and Product files from your Inversion of Control project into the AspNetCoreKata.ProductRepo folder, and remove them from your AspNetCoreKata project
  3. Add these existing files to your class library
  4. Navigate to the list of references in your AspNetCoreKata project and add a reference to your class library

Step 3

Remove the Product.cs model from your main project

  • There should be no reference to your Product.cs anywhere in your Models folder or in the AspNetCoreKata.Models namespace. You'll be referencing the Product class from your Class Library

Step 4

Add inversion of control via. the ConfigureServices method in your Startup.cs file:

  1. Downgrade Unity.Mvc to the most advanced 3 version. Something like this: 3.x.x
  2. Register your IProductRepository interface with your ProductRepository class
  3. Register the IDbConnection interface with the MySQLConnection class

Step 5

Add a constructor for your ProductController and a private readonly property to store your IProductRepository. Should look something like this:

private readonly IProductRepository repo;

public ProductController(IProductRepository repo)
{
    this.repo = repo;
}

This allows your IoC container to set the repo to an instance of your ProductRepository

Step 6

Confirm that everything is done. By the end of the above tasks, your project should:

  • Have no reference to using Dapper within your main project
  • Have no connection strings within your source code; it should be located in your appsettings.json file
  • Have no Product class within your Models folder in your main project