在 asp.net 核心项目中跨程序集注入 NamedOptions？

Question

I have configured a NamedOption in ConfigureServices method of Startup.cs like following:

services.Configure<MyOpts>("myOpts", 
   opts => configuration.Bind("myOpts", opts));

I have a controller action in asp.net core api like following:

public async Task<IActionResult> Insert(CreateUserCommand command)
{
    var id = await Mediator.Send(command);

    return Ok(id);
}

This is my CreateUserCommand :

public class CreateUserCommand
{
    private MyOpts opts { get; }

    public CreateUserCommand(IOptionsSnapshot<MyOpts> opts)
    {
        this.opts = opts.Get("myOpts");
    }

    public long UserId { get; set; }
    public string Username { get; set; }
    public string FirstName { get; set; }
}

When client hits my api, I want MyOpts object injected in CreateUserCommand(IOptionsSnapshot<MyOpts> opts) . CreateUserCommand is in the assembly other than asp.net core project. Is it possible to achieve this behaviour?

Answer 1

If you register also Commands in DI then yes (You usually don't register commands with DI), but based what I see CreateUserCommand is a payload (in your case) so I assume that you don't register it and it will not work (not only in a different assemblies but also in same assemblies). Because you use Mediator I assume that you have a handler for CreateUserCommand and I think there you can inject your configuration and it will work.

Answer 2

Yes, the Default ASP.NET Core DI supports the Injection across the multiple assemblies when done right.

Please refer the nice article for more details.

https://asp.net-hacker.rocks/2017/03/06/using-dependency-injection-in-multiple-projects.html

Hope this helps!