Proposal:Is it possible to support dependency injection when navigating between pages? #10892
Description
Title
Add alternative ways to resolve pages except types, such as factory methods or dependency injection.
Summary
Now
Frame.Navigate(Type pageType, Arg args, TransitionInfo transition);
Expecting methods
Frame.Navigate<HomePage>(args, transition);
Where HomePage can be resolved from the DI container, such as Microsoft.Extensions.DependencyInjection, with its dependencies resolved as well.
or factory method
Frame.Navigate<HomePage>(() => new HomePage(), args, transition);
Rationale
- Dependency can't be resolved when navigation lands, since the
Frame.Navigate(...)method has its own way to create the instance of pages by given type.
// 👇 The type HomePageViewModel can't be resolved from the DI container.
public partial class HomePage(HomePageViewModel vm) : Page
{
}- As the application developed, switching tags with page type is not intuitive.
args.InvokedItemContainer.Tag switch {
nameof(...) => typeof(...)
// the rest of code is all nameof(...) => typeof(...)
}- So I created an
ImmutableDictionary<string, Type>which includes all the pages that can be navigated to, but it needs manual management still.
public readonly static ImmutableDictionary<Route, Type> Routes = new Dictionary<Route, Type>
{
{ Route.HomePage, typeof(HomePage) },
{ Route.FissureSubscribeRulePage, typeof(FissureSubscribeRulePage) },
{ Route.SubscribedFissurePage, typeof(SubscribedFissurePage) },
{ Route.SimpleFissurePage, typeof(SimpleFissurePage) },
{ Route.HardFissurePage, typeof(HardFissurePage) },
{ Route.VoidStormFissurePage, typeof(VoidStormFissurePage) },
{ Route.SettingsPage, typeof(SettingsPage) }
}.ToImmutableDictionary();- What if we
// register services
var builder = Host.CreateApplicationBuilder();
builder.services.AddTransient<HomePageViewModel>();
builder.services.AddTransient<HomePage>();
builder.Build();
// HomePage.xaml.cs
public partial class HomePage : Page
{
public HomePage(HomePageViewModel vm)
{
DataContext = vm;
}
}Scope
| Capability | Priority |
|---|---|
| This proposal will allow developers to accomplish W | Must |
| This proposal will allow end users to accomplish X | Should |
| This proposal will allow developers to accomplish Y | Could |
| This proposal will allow end users to accomplish Z | Won't |
Important Notes
No response
Open Questions
No response