What is the method for employing Dependency Injection in Azure Function .NET 6?

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Dependency Injection (DI) can be employed in Azure Function .NET 6 using the following steps:

1. First, add the required dependencies by installing the following packages:
2. Microsoft.Extensions.DependencyInjection

3. Microsoft.Azure.Functions.Extensions.DependencyInjection

4. Define an interface for the class that you want to inject dependencies into. For example:

public interface IMyService
{
    void DoSomething();
}

1. Implement the interface in the class that you want to inject dependencies into. For example:

public class MyService : IMyService
{
    public void DoSomething()
    {
        // implementation
    }
}

1. Register the dependency in the Startup class using ConfigureServices method. For example:

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        builder.Services.AddSingleton<IMyService, MyService>();
    }
}

1. Inject the dependency into the function class constructor. For example:

public class MyFunction
{
    private readonly IMyService _myService;

    public MyFunction(IMyService myService)
    {
        _myService = myService;
    }

    [FunctionName("MyFunction")]
    public async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
        ILogger log)
    {
        // use _myService in your function logic
        _myService.DoSomething();

        return new OkObjectResult("Done!");
    }
}

1. Build and run the function to test it. The dependency will be automatically injected by the DI container.