Dependency Injection in azure function V2 with configuration file (Json/MXL) - dependency-injection

Question

I have worked in webapi 2 and resolved all the dependencies using unity.
All the dependencies in the application were placed in unity.config file and dependencies will be resolved with below piece of code.
using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.Configuration;
var section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
container = new UnityContainer().LoadConfiguration(section);
Now i have similar requirement to be implemented using Azure V2 functions.
I know it can be implemented with default DI microsoft provides or any others dependency resolver like Autofac.
builder.Services.AddTransient<IEmployee, EmployeeProvider.Employee>();
However, My specific requirement is how the dependency can be resolved in azure V2 functions by placing dependencies in json or config files rather than normal way of resolving 'Services.AddTransient();'.
Any help is appreciated.

Answer 1

Yes, You can have whatever myFile.config.json as you want. All you need to do is just inject it from your Startup class.
var config = new ConfigurationBuilder()
..SetBasePath(Environment.CurrentDirectory)
.AddJsonFile("app.settings.json", optional: true, reloadOnChange: true)
.AddEnvironmentVariables()
.Build();
To access the values from the file you can use the IConfiguration class.
public MyService(IConfiguration configuration){
var emailConfig = configuration.GetSection("Email");
var userName = emailConfig["Username"];
}
Note : The .AddEnvironmentVariables() will deploy it to the portal's app settings automatically!