What is the best practice to get scoped service from singletone service

[HengzheLi]

Some times when I need a scoped service from a singletone service, I have to manually get the tenant level service provider first using below code

var shell = rootProvider.GetRequiredService<IShellHost>();
var sp = shell.GetScopeAsync(root.GetRequiredService<ShellSettings>()).ConfigureAwait(false)
                            .GetAwaiter().GetResult().ServiceProvider;

Then use the tenant level service provider to get scoped service.

It looks verbose. Has a way to inject the tenant level service provider into constructor then it can be used directly?

[jtkech]

If you are sure that your method is called in a scope context

using Microsoft.Extensions.DependencyInjection;
using OrchardCore.Environment.Shell.Scope;

        var service = ShellScope.Services.GetRequiredService<IService>();

In a more aspnetcore way you can inject IHttpContextAccessor to retrieve the current RequestServices. A request context is not the same as a scope context (here the scope of a given tenant / shell) but we take care in a given request that RequestServices is set to the scope service provider of the tenant / shell on which the request was done.

Otherwise if the method is not called in a scope context you should create a scope by using GetScopeAsync(), notice that in your singleton (if tenant singleton not app level one) you can inject ShellSettings that is a tenant singleton. Also make your method async to not have to use GetAwaiter(), under aspnetcore no need for ConfigureAwait(). Then in this context you should use the shell scope by using our helper scope.UsingAsync(), the result being something like this

var scope await _shellHost.GetScopeAsync(_shellSettings);
await scope.UsingAsync(async scope =>
{
    var service = scope.Services.GetRequiredService<IService>();
    ...
});