NonRootScopeLifetime

NonRootScopeLifetime.cs

/*
An Autofac lifetime that ensures dependencies are only resolved from scoped containers.
This acts like a safety-net to prevent captive dependencies:

```
// Register some short-lived dependency using the `NonRootScopeLifetime`
var registration = builder.Register(c => c.Resolve<IStore>().BeginSession()).As<ISession>();

registration.RegistrationData.Lifetime = new NonRootScopeLifetime();
```
*/

class NonRootScopeLifetime : IComponentLifetime
{
    public ISharingLifetimeScope FindScope(ISharingLifetimeScope mostNestedVisibleScope)
    {
        if (mostNestedVisibleScope.ParentLifetimeScope == null) throw new InvalidOperationException("Trying to resolve scoped service from root container.");
        if (mostNestedVisibleScope.ParentLifetimeScope.ParentLifetimeScope != null) throw new InvalidOperationException("This might be ambiguous.");
        return mostNestedVisibleScope;
    }
}