how to create viewmodel with param

I use a viewmodel like

public class RootViewModel(Func<NextViewModel> func, IWindowManager wndManager>
{
   public void ShowNext()
  {
    wndManager.ShowWindow(func());
  }
}

It works well. But if I want to pass a param to the NextViewModel, It cannot work.

public class RootViewModel(Func<int, NextViewModel> func, IWindowManager wndManager>
{
   public void ShowNext(int i)
  {
    wndManager.ShowWindow(func(i));
  }
}

It give me a Unable to find a constructor for type RootViewModel which we can call: error. How can I pass the param to the viewmodel?

[canton7]

The ioc container provided with Stylet isn’t powerful enough to create factories which take arbitrary parameters.

One option is to switch to another ioc container – there’s info on this in the docs.

Another option is to write your own factory:

public class NextViewModelFactory
{
    public QueryViewModel CreateQueryViewModel(JiraQuery query)
    {
        return new QueryViewModel(....);
    }
}

public class RootViewModel(NextViewModelFactory factory, IWindowManager wndManager>
{
   public void ShowNext()
  {
    wndManager.ShowWindow(factory.CreateQueryViewModel(...));
  }
}

Another option is to just instantiate the ViewModel yourself:

public class RootViewModel(NextViewModelFactory factory, IWindowManager wndManager>
{
   public void ShowNext()
  {
    wndManager.ShowWindow(new QueryViewModel(...));
  }
}

This isn’t really an issue with Stylet - it’s a question about dependency injection and ioc containers. You don’t have to use dependency injection, and you don’t have to use Stylet’s (simple) ioc container.

[canton7]

Closing as no response