AppBuilderUseExtensions.Use has to be explicitly called in VB.

[jkang027]

AppBuilderUseExtensions.Use extension method cannot be used in VB (except by calling it explicitly) because its name conflicts with an instance method ( IAppBuilder.Use ) that accepts any number of object parameters and, thus, will always take precedence.

Probably due to the fact that lambda expressions can be implicitly converted to delegates in VB. This code works for C#.

app.Use(async (context, next) =>
{
    using (AsyncScopedLifestyle.BeginScope(container))
    {
        await next();
    }
});

But the VB equivalent does not. Instead of calling the extension method, it calls the instance method.

app.Use(Async Function(context, [next]) As Task
                  Using AsyncScopedLifestyle.BeginScope(container)
                      Await [next]()
                  End Using
              End Function)

The extension has to be called explicitly in VB.

AppBuilderUseExtensions.Use(app, Async Function(context, [next]) As Task
                                     Using AsyncScopedLifestyle.BeginScope(container)
                                         Await [next]()
                                     End Using
                                 End Function)

[analogrelay]

This is unfortunate but I don't know that there's a clear way to fix it. Happy to consider a contribution if someone has a non-breaking way to do this!