Registering and resolving dependencies in a loop

Question

I have the following hardcoded setup in an application using MVVM:

var ips = configFile.Read();

for (string ip in ips)
{
    var tcpClient = new TcpClient(ip);
    var stream = (Stream) tcpClient.GetStream();
    var service = new Service(stream);
    var connectionViewModel = new ConnectionViewModel(service);
    var extendedViewModel = new ExtendedViewModel(connectionViewModel);
}

A number of IP addresses are read from a file, and each address results in a ViewModel being created that displays stuff from the IP.

What is the best approach if I want to let DryIoc handle this? All new objects are unique foreach loop.

Answer 1

Possible option is using Func to pass the ip:

var c = new Container();
c.Register<ExtendedViewModel>();
c.Register<ConnectionViewModel>();
c.Register<Service>();
c.Register<TcpClient>();

foreach (var ip in ips) {
    var getVM = c.Resolve<Func<string, ExtendedViewModel>>();
    var vm = getVM(ip);
    // use vm
}

Update:

For Stream, add the following registration without changing the resolution part:

c.Register<Stream>(Made.Of(
    _ => ServiceInfo.Of<TcpClient>(),
    tcpClient => (Stream)tcpClient.GetStream()));

Made.Of plays nicely with Func and other wrappers resolutions, and can be in the middle of object graph. That's why it is preferable over RegisterDelegate.